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Vertiv Liebert STS2 User Manual

Vertiv Liebert STS2 User Manual

100-1000a, 50/60hz
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Liebert
STS2/PDU
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User Manual—250A-800A, Three-Phase, 60 Hz

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Summary of Contents for Vertiv Liebert STS2

  • Page 1 Liebert STS2/PDU ® ™ User Manual—250A-800A, Three-Phase, 60 Hz...
  • Page 2 Services offers a complete range of start-up services, repair services, preventive maintenance plans and service contracts. For repair or maintenance service outside the 48 contiguous United States, contact Vertiv Services, if available in your area. For areas not covered by Vertiv Services, the authorized distributor is responsible for providing qualified, factory-authorized service.
  • Page 3 Positioning the 250A Only Liebert STS2/PDU Without Anchoring ....... . .
  • Page 4 INSTALLATION DRAWINGS ...........17 INTRODUCTION TO LIEBERT STS2/PDU OPERATION ......68 System Description .
  • Page 5 Configuring the Liebert STS2/PDU via the Terminal ........
  • Page 6 Outline drawing, 250A Liebert STS2/PDU with right side inline distribution.....19 Figure 10 Outline drawing, 250A Liebert STS2/PDU with left side I-Line distribution..... 20 Figure 11 Outline drawing, 250A Liebert STS2/PDU with left side Inline distribution .
  • Page 7 Figure 23 Electrical field connections, 250A Liebert STS2/PDU input/output with CB8....33 Figure 24 Electrical field connections, 250A Liebert STS2/PDU input with CB3 ......34 Figure 25 Electrical field connections, 250A Liebert STS2/PDU input with CB3 &...
  • Page 8 Figure 57 Liebert STS2/PDU touchscreen........
  • Page 9 Input contact isolator settings record ............148 Vertiv | Liebert STS2/PDU User Manual | Rev. 6 | 10/17...
  • Page 10 Vertiv | Liebert STS2/PDU User Manual | Rev. 6 | 10/17 viii...

  • Page 11: Important Safety Instructions

    NOTICE Risk of damage from improper installation. The input sources to the Liebert STS2/PDU must be grounded-wye sources. Input sources other than solidly grounded- wye sources may cause damage to the switch. Liebert neither recommends nor knowingly sells this product for use with life support or other FDA-designated “critical”...
  • Page 12 Operating this unit in a residential area may cause harmful interference that the user must correct at his own expense. Vertiv | Liebert® STS2/PDU ™...

  • Page 13: Unpacking And Inspections

    Locate the bag containing the keys for the front access door. The bag is attached to the cabinet. Compare the contents of the shipment with the bill of lading. Report any missing items to the carrier and to Vertiv Services immediately.

  • Page 14: Handling Considerations

    Verify that all items have been received. If spare parts were ordered, verify their arrival. After the Liebert STS2/PDU has been removed from the pallet, open the door and remove cabinet panels to check for shipping damage to internal components.

  • Page 15: Location Considerations

    2.0 LOCATION CONSIDERATIONS The Liebert STS2/PDU should be placed in a clean, cool and dry location. The 250A unit without an output cabinet requires only front access for installation and maintenance. Both front and side access are required for installation and maintenance of 400-800A units and 250A units with output cabinet. The output cabinet comes factory-installed or either the right or left side, depending on how it was ordered.

  • Page 16: Altitude

    104.0 (40) 102.2 (39) 100.4 (38) 98.6 (37) 96.8 (36) 95.0 (35) 93.2 (34) 94.1 (33) 89.6 (32) 87.8 (31) 86.0 (30) Altitude, Feet (M) Above Sea Level Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017 ™...

  • Page 17: Locating The Liebert Sts2/Pdu

    This section provides instructions for leveling the Liebert STS2/PDU and anchoring the unit to the floor, should that be required. Anchoring the Unit to the Floor The Liebert STS2/PDU can be anchored to the concrete floor to ensure stability for the unit in the event of seismic activity. Positioning the 250A Only Liebert STS2/PDU Without Anchoring The 250A Liebert STS2/PDU is furnished with casters and stabilizing feet.

  • Page 18: Power And Control Wiring

    Verify that all input power and control circuits are de-energized and locked out before making connections inside unit. The two input power feeds (sources) to the Liebert STS2/PDU should be from two independent sources to avoid a common source failure.

  • Page 19: Figure 3 Typical Liebert Sts2/Pdu, One-Line Diagram

    Source 2 Surge Field-Supplied Wiring Transformer 2 Suppression Optional PSP12006 Rev. 1 Figure 4 Typical Liebert STS2/PDU, one-line diagram, with dual static switch output circuit breakers (not available on 250A units) Source 1 Surge Transformer 1 Suppression Output Optional Breaker...

  • Page 20: Circuit Breakers

    Figure 5 Typical Liebert STS2/PDU, one-line diagram, with inline distribution, dual static switch output circuit breakers Source 1 Subfeed 1 Subfeed 2 Optional Optional Surge Transformer 1 Suppression CB13 Optional CB12 Neutral CB3A Ground CB10 CB11 Source 2 Surge Field-Supplied Wiring...

  • Page 21: System Grounding

    The Liebert STS2/PDU output power, ground and neutral busbars accommodate a wide range of wire sizes. The Liebert STS2/PDU busbars accommodate standard two-hole lugs. Table 3 Input/output conduit plate specifications Maximum Number Rating of Conduits Size, in. 2" 250A 2-1/2"...

  • Page 22: Remote Source Selection Wiring

    Remote Source Selection Wiring An optional Remote Source Selection board may be installed in your Liebert STS2/PDU. This board is installed in the same bay as the communications options. See Figures 47 and 48 for the location of these options. See Figure 55 for information on the control wiring for the Remote Source Selection option.

  • Page 23: Output Power Wiring

    5.0 OUTPUT POWER WIRING The Liebert STS2/PDU standard model is provided with a circuit breaker for connecting to the load or a remote distribution cabinet. Other distribution configurations are available. The three main types of distributions available for the Liebert STS2/PDU are: •...

  • Page 24: Options

    The programmable relay board (PRB) provides a means to trigger an external device when an event occurs in the Liebert STS2/PDU. Each PRB has 8 channels. Each channel has two sets of Form-C dry contacts, rated 1A @ 30VDC or 250mA @ 125VAC.

  • Page 25: Input Contact Isolator Board

    Input Contact Isolator Board The Input Contact Isolator Board (ICI) provides a Liebert STS2/PDU module interface for up to eight external user alarm or message inputs to be routed through the Liebert STS2/PDU’s alarm network. The eight contacts are normally open dry contacts. When a contact closes, an event is triggered.

  • Page 26: Remote Source Selection

    If both the input contacts are closed, the current selected preferred source shall be retained. If the unit’s preferred source selection and Remote Source Selection are active at the same time, the Liebert STS2/PDU follows the last request for a preferred source change, regardless of whether it was from the local or Remote Source Selection controls.

  • Page 27: Installation Drawings

    7.0 INSTALLATION DRAWINGS Figure 7 Outline drawing, 250A Liebert STS2/PDU 60.9 (1547mm) 32.3" (820mm) 77.6" (1971mm) FRONT RIGHT SIDE Air Intake Area Do not block air filter, typical 1.1" Hinged Access Panel (27.9mm) To Input Breakers 2.8" (71.1mm) Top Power Conduit Entry Area 24.4"...

  • Page 28: Figure 8 Outline Drawing, 250A Liebert Sts2/Pdu With Right Side I-Line Distribution

    Figure 8 Outline drawing, 250A Liebert STS2/PDU with right side I-Line distribution 76.8 (1950mm) 32.3" (820mm) 77.6 (1970mm) RIGHT SIDE FRONT Air Intake Area Do not block air Top Output 1.1" filter, typical Conduit Entry Area 1.8" (46mm) (27.9mm) (2) 13.1" x 7.9"...

  • Page 29: Figure 9 Outline Drawing, 250A Liebert Sts2/Pdu With Right Side Inline Distribution

    Figure 9 Outline drawing, 250A Liebert STS2/PDU with right side inline distribution 76.8 (1950mm) 32.3" (820mm) 12.5" 77.6 (318mm) (1970mm) 8.1" (206mm) 0.88" Diameter Typically 42 Places Detail B 2.75" FRONT RIGHT SIDE Air Intake Area (69.8mm) Do not block air 2.1"...

  • Page 30: Figure 10 Outline Drawing, 250A Liebert Sts2/Pdu With Left Side I-Line Distribution

    Figure 10 Outline drawing, 250A Liebert STS2/PDU with left side I-Line distribution 76.8 (1950mm) 32.3" (820mm) 77.6 (1970mm) Air Intake Area LEFT SIDE FRONT Do not block air filter, typical 2.75" Top Output (69.8mm) 12mm Diameter Conduit Entry Areas Typical Threaded Mounting (2) 13.1"...

  • Page 31: Figure 11 Outline Drawing, 250A Liebert Sts2/Pdu With Left Side Inline Distribution

    Figure 11 Outline drawing, 250A Liebert STS2/PDU with left side Inline distribution 76.8 (1950mm) 32.3" (820mm) 77.6 (1970mm) 2.75" (69.8mm) FRONT LEFT SIDE Air Intake Area 12mm Diameter Typical Do not block air Threaded Mounting filter, typical Hole; 4 typically See Note 9 1.7"...

  • Page 32: Figure 12 Outline Drawing,400-600A Liebert Sts2/Pdu With Right Side Inline Distribution

    Figure 12 Outline drawing,400-600A Liebert STS2/PDU with right side inline distribution 49.4" (1255mm) 23.9" 73.3" (1861mm) (606mm) 77.4" (1966mm) Air Intake Area FRONT RIGHT SIDE Do not block air filter Top Input Power 1. Approximate weight: 400A - 4608 lb. (2095kg) Conduit Entry Area 600A - 5692 lb.

  • Page 33: Distribution

    Figure 13 Outline drawing, 400-600A Liebert STS2/PDU with right side output breaker or I-Line distribution 49.4" 73.3" (1861mm) 23.9" (1255mm) (606mm) 77.4" (1966mm) RIGHT SIDE Air Intake Area FRONT Do not block air filter. Top Input Power 1.8' Conduit Entry Area 17.2"...

  • Page 34: Figure 14 Outline Drawing, 400-600A Liebert Sts2/Pdu With Left Side Inline Distribution

    Figure 14 Outline drawing, 400-600A Liebert STS2/PDU with left side inline distribution 49.4" 23.9" (1255mm) 73.3" (1861mm) (606mm) 1. Approximate weight: 400A - 4608 lb. (2095kg) 600A - 5692 lb. (2587kg). 2. 18" (457mm) clearance above unit required for air exhaust.

  • Page 35: Distribution

    Figure 15 Outline drawing, 400-600A Liebert STS2/PDU with left side output breaker or I-Line distribution 49.4" 23.9" (1255mm) 73.3" (1861mm) (606mm) 77.4" (1966mm) Air Intake Area FRONT LEFT SIDE Do not block air filter Top Control Conduit Box Entry Top Input Power Conduit 1.

  • Page 36: Distribution

    Figure 16 Outline drawing, 800A Liebert STS2/PDU with right side output breaker or I-Line distribution 96.9" (2461mm) 49.4" 39.9" (1013mm) 57" (1448mm) (1255mm) Shipping Split Shipping Split 77.4" (1966mm) Air Intake Area RIGHT SIDE FRONT Do not block air filter.

  • Page 37: Figure 17 Outline Drawing, 800A Liebert Sts2/Pdu With Right Side Inline Distribution

    Figure 17 Outline drawing, 800A Liebert STS2/PDU with right side inline distribution 96.9" (2461mm) 49.4" 39.9" (1013mm) 57" (1448mm) (1255mm) Shipping Split Shipping Split 77.4" (1966mm) RIGHT SIDE Air Intake Area FRONT Do not block air filter. Typical Bottom Input Power Conduit 54"...

  • Page 38: Distribution

    Figure 18 Outline drawing, 800A Liebert STS2/PDU with left side output breaker or I-Line distribution 96.9" (2461mm) 49.4" 57" (1448mm) 39.9" (1013mm) (1255mm) Shipping Split Shipping Split 77.4" (1966mm) FRONT Air Intake Area LEFT SIDE 1. Approximate weight: 8618 lb. (3917kg) Do not block air filter.

  • Page 39: Figure 19 Outline Drawing, 800A Liebert Sts2/Pdu With Left Side Inline Distribution

    Figure 19 Outline drawing, 800A Liebert STS2/PDU with left side inline distribution 96.9" (2461mm) 49.4" 57" (1448mm) 39.9" (1013mm) (1255mm) Shipping Split Shipping Split 77.4" (1966mm) Air Intake Area FRONT LEFT SIDE 13.6" Do not block air filter. (345mm) Typical Bottom Input 7"...

  • Page 40: Figure 20 Outline Drawing, 250A Liebert Sts2/Pdu With Key Lockout Switch Option

    Figure 20 Outline drawing, 250A Liebert STS2/PDU with key lockout switch option 80.9" (1547mm) 32.3" (820mm) Lockout Switch 77.6" (1970mm) 2.75" RIGHT SIDE Air Intake Area FRONT (69.8mm) Do not block air 12mm Diameter Typical filter. Typical Threaded Mounting 1.1" (27.9mm) Hole;...

  • Page 41: Lockout Switch Option

    Figure 21 Outline drawing, 400-600A Liebert STS2/PDU, inline distribution, right side with key lockout switch option 49.4" (1255mm) 23.9" 73.3" (1861mm) (606mm) Lockout Switch 77.4" (1966mm) FRONT Air Intake Area RIGHT SIDE Do not block air filter. Top Input Power Conduit 1.

  • Page 42: Switch Option

    Figure 22 Outline drawing, 800A Liebert STS2/PDU, inline distribution, right side with key lockout switch option 96.9" (2461mm) 49.4" 39.9" (1013mm) 57" (1448mm) (1255mm) Shipping Split Shipping Split Lockout Switch 77.4" (1966mm) FRONT RIGHT SIDE Air Intake Area Do not block air filter.

  • Page 43: Figure 23 Electrical Field Connections, 250A Liebert Sts2/Pdu Input/Output With Cb8

    Figure 23 Electrical field connections, 250A Liebert STS2/PDU input/output with CB8 1.75" See Source, (44mm) Typical Neutral, and Source 1 Busbar Output Busbar Approx. 7.5 X 3.2 Detail A (191 x 81mm) Source 1 1/2"-13 PEM Nut Typ. 4 Places...

  • Page 44: Figure 24 Electrical Field Connections, 250A Liebert Sts2/Pdu Input With Cb3

    Figure 24 Electrical field connections, 250A Liebert STS2/PDU input with CB3 1.75" See Source (44mm) Busbar Typical Source 1 Busbar Detail A Approx. 7.5 x 3.2 (191 x 81mm) 1/2"-13 PEM Nut Typ. 4 Places Source 1 No Customer Connections...

  • Page 45: Figure 25 Electrical Field Connections, 250A Liebert Sts2/Pdu Input With Cb3 & Cb3A

    Figure 25 Electrical field connections, 250A Liebert STS2/PDU input with CB3 & CB3A 1.75" (44mm) Typical Source 1 Busbar Approx. 7.5 x 3.2 (191 x 81mm) See Source 1/2"-13 PEM Nut Busbar Typ. 4 Places Detail A No Customer Connections...

  • Page 46: Figure 26 Electrical Field Connections, 400-600A Liebert Sts2/Pdu Input With Cb3

    Figure 26 Electrical field connections, 400-600A Liebert STS2/PDU input with CB3 Source 1 Input Ø A Source 1 Input Ø B Source 1 Input Ø C Source 2 Input Ø A Source 2 Input Ø B Source 2 Input Ø C Ground .56"...

  • Page 47: Figure 27 Electrical Field Connections, 400-600A Liebert Sts2/Pdu Input With Cb3 And Cb3A

    Figure 27 Electrical field connections, 400-600A Liebert STS2/PDU input with CB3 and CB3A Source 1 Input Ø A CB3A Source 1 Input Ø B Source 1 Input Ø C Source 2 Input Ø A Source 2 Input Ø B Source 2 Input Ø C Ground .56"...

  • Page 48: Figure 28 Electrical Field Connections, 800A Liebert Sts2/Pdu Input With Cb3

    Figure 28 Electrical field connections, 800A Liebert STS2/PDU input with CB3 Source #2 Source #1 See Input 0.63" .41" DIA. .56" DIA. Busbar Detail (15.9mm) (10.3mm) (14.3mm) Typ. 8 Places Typ. 6 Places Ground busbar A B C (not shown) is 3"...

  • Page 49: Figure 29 Electrical Field Connections, 800A Liebert Sts2/Pdu Input With Cb3 And Cb3A

    Figure 29 Electrical field connections, 800A Liebert STS2/PDU input with CB3 and CB3A Source #2 Source #1 See Input 0.63" .41" DIA. .56" DIA. (15.9mm) Busbar Detail (10.3mm) (14.3mm) Typ. 8 Places Typ. 6 Places Ground busbar (not shown) is 3"...

  • Page 50: Figure 30 Electrical Field Connections, 250A Liebert Sts2/Pdu Output With Inline Panelboards

    Figure 30 Electrical field connections, 250A Liebert STS2/PDU output with inline panelboards Panelboard Main Breaker and (CB9) Subfeed Breaker Subfeed Breaker (CB10) (Optional) CB11, Optional 42 Pole Distribution Panelboards Subfeed Breaker NEUTRAL CONNECTIONS CB10 Output Distribution Cables Connection Neutral(s) connected...

  • Page 51: Figure 31 Electrical Field Connections, 400-800A Liebert Sts2/Pdu Output With Inline Panelboards

    Figure 31 Electrical field connections, 400-800A Liebert STS2/PDU output with inline panelboards Subfeed Breaker Subfeed Breaker CB13, Optional CB12, Optional Panelboard Main Panelboard Breaker Main Breaker CB11 and CB9 and CB10 42 Pole Distribution Panelboards Neutral Connections Subfeed Breaker Distribution Cables...

  • Page 52: Figure 32 Electrical Field Connections, Liebert Sts2/Pdu Output With I-Line Panelboard

    Figure 32 Electrical field connections, Liebert STS2/PDU output with I-Line panelboard 28.4" (721mm) 1.75" 2.06" (52.3mm) Typ. (44mm) 4" (102 mm) 3.1" 3.28" (78.7mm) 3.28" (83.3mm) .56" DIA. (83.3mm) (14.2mm) DETAIL A Typ. 20 Places Output Neutral Busbar Approx. 1/2" Thick 27.7"...

  • Page 53: Figure 33 Electrical Field Connections, 400-600A Liebert Sts2/Pdu With Right Side Output Breaker

    Figure 33 Electrical field connections, 400-600A Liebert STS2/PDU with right side output breaker 1" 10.3" (262mm) Output (25.4mm) Breaker 1.75" (44.5mm) 2" (51mm) 4" (102mm) Phase A .56" DIA. 0.75" (14.2mm) (19mm) Phase B Typ. 4 Places BUSBAR DETAIL Phase C 1.

  • Page 54: Figure 34 Electrical Field Connections, 400-600A Liebert Sts2/Pdu With Left Side Output Breaker

    Figure 34 Electrical field connections, 400-600A Liebert STS2/PDU with left side output breaker 1" 10.3" (262mm) (25.4mm) 1.75" (44.5mm) Output Breaker 2" (51mm) 4" (102mm) .56" DIA. 0.75" (14.2mm) (19mm) Typ. 4 Places BUSBAR DETAIL Phase A 1. Phase and ground busbars are 1/4" thick.

  • Page 55: Figure 35 Electrical Field Connections, 800A Liebert Sts2/Pdu With Right Side Output Breaker

    Figure 35 Electrical field connections, 800A Liebert STS2/PDU with right side output breaker 1" 10.3" (262mm) (25.4mm) 1.75" (44.5mm) Output Breaker 4" 2" (51mm) (102mm) 0.56" (14.2mm) 0.75" (19mm) Typical, 4 Places BUSBAR DETAIL Phase A Phase B Phase C...

  • Page 56: Figure 36 Electrical Field Connections, 8600A Liebert Sts2/Pdu With Left Side Output Breaker

    Figure 36 Electrical field connections, 8600A Liebert STS2/PDU with left side output breaker 10.3" (262mm) 1" (25.4mm) 1.75" (44.5mm) Output Breaker 4" 2" (51mm) (102mm) 0.56" (14.2mm) 0.75" (19mm) Typical, 4 Places BUSBAR DETAIL Phase A Phase B Phase C...

  • Page 57: Figure 37 Electrical Field Connections, 800A Liebert Sts2/Pdu Interconnect Wiring

    Figure 37 Electrical field connections, 800A Liebert STS2/PDU interconnect wiring Breaker Section Section Front See Section A-A Drawing PSP11019 Ground Busbar See Ground Busbar Detail Neutral Busbar See Neutral See Section C-C See Section B-B Busbar Detail Drawing PSP11019 Drawing PSP11019...

  • Page 58: Figure 38 Electrical Field Connections, 800A Liebert Sts2/Pdu Interconnect Wiring, Breaker Section

    Figure 38 Electrical field connections, 800A Liebert STS2/PDU interconnect wiring, breaker section TB2 and TB3 See Enlarged Ground Busbar Detail Below See Ground SECTION A - A Busbar Details in Neutral Busbar See Enlarged Drawing PSP11018 Breaker Section See Drawing...

  • Page 59: Figure 39 Electrical Field Connections, 800A Liebert Sts2/Pdu Interconnect Wiring, Sts Section

    Figure 39 Electrical field connections, 800A Liebert STS2/PDU interconnect wiring, STS section Source 2 Phase B W25,A,B,C & D W29A,B,C, & D to Output Phase B W23A,B,C, & D to Output Phase C Output Phase A W28A,B,C & D Source 1 Phase C W26A,B,C, &...

  • Page 60: Distribution Cabinet

    Figure 40 Electrical field connections, 800A Liebert STS2/PDU interconnect wiring, left side distribution cabinet NOTES 1. The neutral is factory-wired. 2. Interconnection wiring from breaker busbars A, B and C to SECTION A - A Distribution Section are attached to breaker busbars and shipped in See Details Below the breaker section.

  • Page 61: Figure 41 Electrical Field Connections, 800A Liebert Sts2/Pdu Interconnect Wiring, Left Side One-Line

    Figure 41 Electrical field connections, 800A Liebert STS2/PDU interconnect wiring, left side one-line Distribution Breaker Section Section Section Busbar A Busbar B Busbar C Area See Drawing See Drawing PSP11020 Busbar A PSP11021 Section E - E For Details Busbar B...

  • Page 62: With Cb3A

    Figure 42 Electrical field connections, 800A Liebert STS2/PDU interconnect wiring, left side one-line with CB3A Breaker Distribution Section Section Section Busbar A Busbar B Busbar C AREA See Drawing PSP11020 Busbar A Drawing Section E - E PSP11021 Busbar B...

  • Page 63: One-Line

    Figure 43 Electrical field connections, 800A Liebert STS2/PDU interconnect wiring, right side one-line Breaker Distribution Section Section Section Area See Drawing PSP11020 Section E - E See Drawing PSP11020 Section D - D X1 X2 X3 X0 Drawing H1 H2 H3...

  • Page 64: One-Line With Cb3A

    Figure 44 Electrical field connections, 800A Liebert STS2/PDU interconnect wiring, right side one-line with CB3A Breaker Distribution Section Section Section Area See Drawing PSP11020 Section E - E CB3A See Drawing PSP11020 Section D - D Drawing X1 X2 X3 X0...

  • Page 65: Figure 45 Control Wiring, 800A Liebert Sts2/Pdu, Left Side Distribution

    Figure 45 Control wiring, 800A Liebert STS2/PDU, left side distribution Distribution Breaker Section Section Section Fan Assembly CN35 CN35 (Cap) (Plug) Display CN31 CN31 (Plug) (Cap) Breaker Area CN33 CN33 (Cap) (Plug) CN25 CN25 AREA (Cap) (Plug) CN15 CN15 (Plug)

  • Page 66: Figure 46 Control Wiring, 800A Liebert Sts2/Pdu, Right Side Distribution

    Figure 46 Control wiring, 800A Liebert STS2/PDU, right side distribution Distribution Breaker Section Section Section Fan Assembly CN35 CN35 (Cap) (Plug) Display CN31 CN31 (Plug) (Cap) Breaker Area CN25 CN25 AREA (Cap) (Plug) CN15 CN15 (Plug) (Cap) Board P999 CN34...

  • Page 67: Figure 47 Control Connection Location, 250A Liebert Sts2/Pdu

    Figure 47 Control connection location, 250A Liebert STS2/PDU See Option Location Detail Remote Source Select (Option) Programmable Relay Board (Option) See Note 2 Programmable Relay Board (Option) See Note 2 Input Contact Isolator Board (Option) or Programmable Relay Board (Option) See Note 2...

  • Page 68: Figure 48 Control Connection Location, 400-800A Liebert Sts2/Pdu

    Figure 48 Control connection location, 400-800A Liebert STS2/PDU Remote Source Select (Option) Programmable Relay Board (Option) See Note 2 Programmable Relay Board (Option) See Note 2 Input Contact Isolator Board (Option) or Programmable Relay See Option Board (Option) See Note 2...

  • Page 69: Figure 49 Control Location Drawing Conduit Box, Top Entry, 400-600A Liebert Sts2/Pdu

    Figure 49 Control location drawing conduit box, top entry, 400-600A Liebert STS2/PDU Control Conduit Box See Detail A and Notes. DETAIL A Remove side cover to install conduit and cables. Then replace side cover. Control Conduit Box UNIT WITH CONDUIT...

  • Page 70: Figure 50 Control Wiring For The Programmable Relay Board Option

    4 - 6 7 - 9 10 - 12 13 - 15 PS213001 1 - 3 Rev. 2 NOTE: Pin 16 not used on J71, J72 and J73 Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017 ™...

  • Page 71: Figure 51 Control Wiring For The Input Contact Isolator Board Option

    6. Signal voltage: 100mA @ 12VDC. 7. Maximum cable length 500 ft. (152 meters) with #16 AWG flexible, stranded cable. 8. All wiring must be in accordance with national and local electrical codes. Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017...

  • Page 72: Figure 52 Control Wiring For Comms Board

    3. Refer to control connection location diagram of static transfer switch for location of Comms Board. 4. All wiring must be in accordance with national PS213003 and local electrical codes. Rev. 4 Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017 ™...
  • Page 73 5. Refer to control connection location diagram of static transfer switch for location of Liebert IntelliSlot Web/485 card option. PS213008 6. All wiring must be in accordance with national and local electrical codes. Rev. 3 Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017 ™...

  • Page 74: Figure 54 Control Wiring For The Rs-232 Port

    2. Connector accessible with front door opened. connector must be removed before closing door. FRONT VIEW PS213006 Upper Half of Unit Rev. 1 With Door Open Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017 ™...

  • Page 75: Figure 55 Control Wiring For Remote Source Selection Option

    5. All wiring must be in accordance with national and local electrical codes. TB50 PS213007 Rev. 2 Remote Source Selection Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017 ™...

  • Page 76: Figure 56 Color Lcd Touchscreen

    Figure 56 Color LCD touchscreen Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017 ™...

  • Page 77: Table 10 Input Circuit Breaker Schedule, 250-800A

    GERIN 600A 208V Square D 600A 208-240V 800A 208V Square D 800A 208-240V Table 12 Non-automatic breaker schedule, 250-800A Circuit Breakers Liebert STS2/PDU (See One-Line Withstand Rating Diagrams) Vendor Type Ampacity Voltage Current 208-240V 125K CB1, CB2, CB3 250A Square D...

  • Page 78: Introduction To Liebert Sts2/Pdu Operation

    Redundant circuits and components are used to eliminate single points of failure. Since the Liebert STS2/PDU has two input sources, no single component failure can cause a loss of power to the load. Redundant power supplies are provided which feed a DC dual-bus used throughout the unit to prevent any single-point power supply failure modes.

  • Page 79: Reliability And Agency Requirements

    8.1.2 Reliability and Agency Requirements The Liebert STS2/PDU is designed for high reliability and high availability with a critical bus Mean Time Between Failure (MTBF) exceeding 1,000,000 hours. The Liebert STS2/PDU and all its options are designed, tested and certified, where applicable, to meet agency requirements as follows: •...

  • Page 80: Transfer

    8.2.4 Bypass The Liebert STS2/PDU can be manually bypassed to allow the power from a source to directly flow to the output load. This bypass allows the unit’s electronics to be serviced without dangerous voltages being present. The Liebert STS2/PDU includes key-interlocked maintenance bypass breakers that allow either input source’s electronics to be bypassed for maintenance without interruption of power to the load.

  • Page 81: Theory Of Operation

    9.0 THEORY OF OPERATION General Description The Liebert STS2/PDU contains all the equipment necessary to prevent an interruption in power flow to the AC load, should your primary source fail. 9.1.1 Liebert Static Transfer Switch 2/Power Distribution Unit The Liebert STS2/PDU is a combination automatic static transfer switch and power distribution unit. The Liebert...

  • Page 82: Emergency Transfer

    Load Current Transfer Inhibit The Liebert STS2/PDU senses the load current. If the load current exceeds the preset level deemed to represent a load inrush or fault condition, the unit’s logic disables manual and automatic transfers, even if the selected source’s input voltage is outside the acceptable limits.

  • Page 83: Circuit Breakers And Non-Automatic Circuit Breakers

    Hardware • The Liebert STS2/PDU operator interface in the Color Graphical Display unit is designed to provide all of the information required to configure and monitor the unit’s operation. • The control logic performs automatic operations with minimal operator interface.

  • Page 84: Audible Alarm

    RS-232 Port An RS-232 serial port is provided to allow an external terminal to be connected as another user interface. See 12.1 - Using the RS-232 Port for more information. Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017...

  • Page 85: Operating Instructions

    Before unit is placed into service for the first time, after equipment relocation or after the equipment has been de-energized for an extended period, a thorough equipment inspection and supervised startup by qualified personnel are strongly recommended. Contact your local Liebert representative or Vertiv Services at 800-543-2378 to arrange for equipment inspection and startup.

  • Page 86: Normal System Turn-On

    Verify that Source 2 voltages are nominal and that CB2 breaker status is correctly indicated on the Mimic screen. Verify that boxes for the preferred source and corresponding Liebert STS2/PDU are highlighted on the Mimic screen, indicating which side of the Liebert STS2/PDU is on.

  • Page 87: Manual Transfer / Preferred Source Selection

    Source Setpoints. See User Settings on page 101. NOTE If one source will be de-energized for an extended period (hours or days), set the Liebert STS2/PDU to bypass mode for the remaining source. Without using bypass, if a failure occurs in the switch components for the remaining source, the Liebert STS2/PDU does not have a second source to switch to and the load would not receive power.

  • Page 88: Enabling Remote Source Selection

    Select YES for the REMOTE SOURCE SELECT choice. 10.4 Maintenance Bypass The Liebert STS2/PDU is equipped with two key-interlocked, bypass breakers, CB4 and CB5, to allow manual bypass of the switch electronics for either input source in the event of switch failure or for maintenance of the switch.

  • Page 89: Bypass Procedures For Source 1

    10. Rotate the CB1 interlock key and remove it to lockout the breaker. 11. Secure the key, per your site’s lockout/tagout procedure. 12. Open output breakers CB3 and CB3A (if supplied) to remove power and isolate the static switch from the load. Vertiv | Liebert® STS2/PDU ™...

  • Page 90: Bypass Procedures For Source 2

    10. Rotate the interlock key and remove it to lockout the breaker. 11. Secure the key, per your site’s lockout/tagout procedure. 12. Open output breakers CB3 and CB3A (if supplied) to remove power and isolate the static switch from the load. Vertiv | Liebert® STS2/PDU ™...

  • Page 91: Normal System Shutdown

    See Figure 60. 10.5 Normal System Shutdown The Liebert STS2/PDU can be shut down from either the static switch mode or the bypass mode. 10.5.1 Shutdown in Static Transfer Switch Mode When the Liebert STS2/PDU is operating on static transfer switch mode (not maintenance bypass mode): Turn off the load equipment per manufacturer’s recommendations.

  • Page 92: Alarms And Faults

    Event actions can be triggered by the settings configured from the Event Masks. See 11.1 - Event Mask for more information. Faults — A fault indicates that a component of the Liebert STS2/PDU has failed or has been damaged. In the Event Display, faults are indicated in red.

  • Page 93: Event And History Logs

    The History Log should not be reset until the fault condition that caused the buffer to freeze is reviewed and investigated by a qualified service technician. After the alarm condition has been corrected, the History Log can be cleared. Vertiv | Liebert® STS2/PDU ™...

  • Page 94: Alarm Notes

    Replay Rate — indicates how long it takes for the replay to play. Use the UP and DOWN buttons to set the time. • Status — the status of the Liebert STS2/PDU at the point of the current frame in the replay. The History log has three statuses: Frozen, Not Frozen and Retrieving Data, please stand by.
  • Page 95 Output circuit breaker (CB3A) is open. A, E S1 PHASE ROT ERROR Source 1 phase rotation error. A, E S2 PHASE ROT ERROR Source 2 phase rotation error. A, E Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017 ™...
  • Page 96 The event log has been erased. HIST LOGS CLEARED Both History Logs have been erased. XFER COUNT CLEARED Transfer counter reset to 0 KWH COUNT CLEARED KW-Hrs counter reset to 0 Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017 ™...

  • Page 97: Communication Interfaces

    See Figure 51 for wiring details. • Programmable relay board (PRB) (optional) — up to two PRBs can be installed in the Liebert STS2/PDU to route Liebert STS2/PDU events to external devices. See Configuring the Programmable Relay Board Settings on page 109 for default settings and instructions for reconfiguring the relays.

  • Page 98: Using The Rs-232 Port

    Connecting and Using a Terminal An RS-232 connection can be used to connect the Liebert STS2/PDU to either a terminal or a PC running terminal emulation software. If unsure of the cable pin out, see 14.2.10 - Terminal Port Connections.

  • Page 99: Configuring The Liebert Sts2/Pdu Via The Terminal

    12.1.2 Configuring the Liebert STS2/PDU via the Terminal The SPT command is used to configure the systems setpoints. The SVT syntax for the setpoints consists for four parameters: SPT [group] [item] [value] where the parameters are: • SPT — is the terminal command that is used to configure setpoints.

  • Page 100: Table 15 Value Types

    0 = 2400, 1 = 9600, & 2 = 19200 bps Modem LGS Check - Day Bitpacked Modem LGS Check - Time Bitpacked Comms Options 1 Bitpacked See section 12.1.3. Comms Options 2 Bitpacked See section 12.1.3. Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017 ™...
  • Page 101 1 to 63 Event Mask settings for faults Event Mask See section 12.1.3. Event Mask 64 to 143 Event Mask settings for alarms Event Mask See section 12.1.3. Settings Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017 ™...

  • Page 102: Setting Bitpacked Options With The Terminal

    — OCDO2Assignment (0=User Defined, 1=Standard Set or 2=AS400) bit6 through bit15 — not used (set to 0) Critical Option Enabling • bit0—EnableManual_IPeakReset • bit1—EnableAutoRestart • bit2 through bit15 - not used (set to 0) Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017 ™...

  • Page 103: Table 17 Binary-Hexadecimal Conversions

    Convert the binary value each group into its hex equivalent. Enter the hex values for each group, in order, into the command for the value parameter. The following example explains how the conversion is completed. Vertiv | Liebert® STS2/PDU ™...

  • Page 104: Setting Event Masks With The Terminal

    Unlike the System and User Settings, mask values are set by designated letters, not hex values. However, as with other RS-232 interface settings, four parameters are passed. See 12.1.2 - Configuring the Liebert STS2/PDU via the Terminal for more details about the parameters. The syntax for configuring event masks is: SPT 4 ID ±D±L±S±E±A...
  • Page 105 120 — item parameter. In this command, that is the event ID. • -D-L-S-E-A — value parameter. In this case, the minus sign (-) disables all masks for the INPUT CONTACT #1 event. Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017...

  • Page 106: Touchscreen Display

    The LCD provides a color, back-lit touchscreen as a user interface. In addition to the Mimic and the system parameters, the screen provides a series of menus to allow you to configure the Liebert STS2/PDU, including the control of the preferred source, auto/manual retransfer selection, alarm notification and other system setpoints.

  • Page 107: Menu Overview

    Use the back arrow button (<-) to delete unwanted characters. This button functions like a backspace key on a keyboard. Figure 63 Keyboard and keypad displays Backspace Backspace Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017 ™...

  • Page 108: Security

    An optional key lockout switch for the Liebert STS2/PDU enables or disables the ability to make changes on the Liebert STS2/PDU. The key lockout switch is located on the front of the unit next to the display; it is behind the front door but can be operated without opening the front door.

  • Page 109: Mimic Display

    13.3 Mimic Display The Mimic display provides a color diagram of the operation of the Liebert STS2/PDU. This display imitates the power flow through the Liebert STS2/PDU and indicates source status, breaker status, switch status, source voltage and current readings, output power measurements and active alarm messages. See Figure 61.

  • Page 110: Figure 65 Event Mask Dialog Box

    Event Masks The Liebert STS2/PDU gathers, processes and reports faults and alarms, collectively referred to below as events. The Event Mask dialog box allows you to set the system’s response for specific alarms and faults that are generated. See 11.0 - Alarms and Faults for more information on events and 11.1 - Event Mask for the definitions of the Event Mask types.

  • Page 111: Figure 66 User Settings Dialog Box

    The User Settings dialog box is displayed. See Figure 66. The top six buttons access a series of secondary dialog boxes to configure the various settings. Figure 66 User settings dialog box Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017...

  • Page 112: Figure 67 Source Setpoints

    OV refers to over voltage or the amount of voltage over the nominal voltage. • Fast UV Setting (%) — if the voltage drops below this set percentage of the nominal voltage, the Liebert STS2/PDU transfers from the current source to the opposite source. •...

  • Page 113: Table 18 Setpoint Parameters

    • Select YES to enable the automatic restart. • Select NO to disable the automatic restart. This settings requires a manual restart of the Liebert STS2/PDU. Vertiv | Liebert® STS2/PDU ™...

  • Page 114: Figure 68 Pdu Setpoints

    • Select AUTO to configure the Liebert STS2/PDU to automatically reset when a fault clears and the voltage and current are normal. • Select MAN to require a manual reset of the Liebert STS2/PDU when fault clears and the voltage and current are normal.

  • Page 115: Figure 69 Comm Options Dialog Box

    Select CONFIG from the menu bar. Select SYSTEM SETTINGS from the Config menu. Comm Options The Comm Options dialog box allows you to configure the communications settings for the Liebert STS2/PDU. • Select COMM OPTIONS from the System Settings Menu.

  • Page 116: Figure 70 Modem Dialog Box

    Configuring the Modem The Modem dialog box allows configuring an external modem connected to the Liebert STS2/PDU. The dialog box contains a series of choices that access either a keypad or a secondary dialog to configure settings. Auto dial can also be configured for the modem to be triggered by events, as set up in the Event Mask choices.
  • Page 117 Select YES in the Modem dialog box to activate the Modem Health Check. If you select NO, the Modem Health Check is not run. 12. Configure AUTO DIAL IN. Auto Dial In allows a user to dial into the Liebert STS2/PDU through the modem to check status and access the system via a hyperterminal connection.

  • Page 118: Figure 71 Input Contact Isolator Dialog Box

    10. Enter the settings in Table 33 - Input contact isolator settings record. This information is not saved if control power is removed. 11. Select OK in the Comm Options dialog box to activate the settings. Vertiv | Liebert® STS2/PDU ™...

  • Page 119: Table 20 Standard Settings For Programmable Relays

    The Liebert STS2/PDU can contain up to two programmable relay boards (PRB) that can trigger an external device when an event occurs in the Liebert STS2/PDU. For example, if Source 1 fails, an external light flashes. See 6.1 - Programmable Relay Board for more information on the PRBs.

  • Page 120: Figure 72 Programmable Relay Board Dialog Box

    Configuring the Liebert IntelliSlot Web/485 Card With Adapter A Liebert IntelliSlot Web/485 Card With Adapter (IS-WEB485ADPT) can be installed in the Liebert STS2/PDU to provide Ethernet connectivity via an RJ-45 port. Ethernet cabling is the responsibility of the customer. Category 5 cabling is required.

  • Page 121: Figure 73 System Options

    SiteScan is Liebert’s system-monitoring software that allows you to utilize a PC to monitor the Liebert STS2/PDU’s status and check alarms. See 6.3 - Comms Board for more information on this board. If the Liebert STS2/PDU will be connected to Liebert SiteScan: •...

  • Page 122: Figure 74 Pdu Options Button

    PDU transformer is configured as a Wye or Delta changes the firing sequence of the SCRs. If the Liebert STS2/PDU is connected to a PDU configured as a Wye: • Select YES for the Wye Output Transformer choice in the System Options dialog box.

  • Page 123: Logs

    13.7.1 Logs Two types of logs are kept by the Liebert STS2/PDU: Event Log and History Log. Event Log The Event Log tracks the alarms and faults of the Liebert STS2/PDU. See 11.0 - Alarms and Faults for more information on these events and see 11.2.1 - Event Log for more information on the Event Log and definitions of the fields displayed in the Event Log screen.

  • Page 124: Source Transfers

    The Source Transfer choice (SOURCE XFERS) allows you to manually select a preferred source. To switch the primary source, refer to 10.2 - Manual Transfer / Preferred Source Selection. 13.7.3 Startup Procedure You can access instructions for starting the Liebert STS2/PDU from the menu bar. • From the menu bar, select STARTUP PROC.

  • Page 125: Specifications

    14.1.1 Frequency The Liebert STS2/PDU accepts input frequencies of 50 Hz or 60 Hz, depending on the model ordered. The frequency shall be within +/- 0.5 Hz of the nominal frequency. 14.1.2 Input Voltage The Liebert STS2/PDU models are available to handle various voltages.

  • Page 126: Grounding

    14.1.8 Response Time A dual level fast/slow transfer threshold is used for under voltage detection to allow the Liebert STS2/PDU to be compatible with UPS's and generators. The voltage thresholds and the slow transfer delay time is user- adjustable.

  • Page 127: System Components

    14.2.1 Frame and Enclosure The complete Liebert STS2/PDU is housed in a freestanding enclosure. The cabinet is a NEMA type 1 enclosure. The cabinet is structurally designed to handle lifting from the base. The frame is designed to accommodate floor stands.

  • Page 128: Access

    14.2.4 Access The Liebert STS2/PDU is designed so repairs and maintenance can be done from the front, side or top of the unit. All components that may need repair or replacement during routine field maintenance are safely accessed with the units in bypass without removing power from the unit. These components include: •...

  • Page 129: Color Graphical Display

    ISO_RXD Isolated service terminal transmit output ISO_TXD Isolated service terminal receive input No Connection ISO_GND Isolated service terminal ground No Connection No Connection No Connection No Connection Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017 ™...

  • Page 130: Rs-232 Interface Parameters

    Local Echo 14.2.12 Maintenance Bypass The Liebert STS2/PDU is configured to allow the unit’s electronics to be bypassed to either input source for maintenance without interruption of power to the load. The Liebert STS2/PDU is furnished with key-interlocked maintenance bypass breakers to configure the bypass.

  • Page 131: Event Message Help Text

    Liebert authorized distributor can provide technical support. Press SILENCE on the touchscreen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2/PDU system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 132 PRIMARY FAN FAIL Primary Fan Failure One of the primary cooling fans for the Liebert STS2/PDU has failed. The alternate fans are now running. The alternate fans are not monitored. Contact technical support; in the United States, call 800-543-2378. Outside the 48 contiguous United States contact Vertiv Services, if available in your area.
  • Page 133 Vertiv-authorized distributor can provide technical support. Press SILENCE on the touchscreen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2/PDU system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 134 Vertiv-authorized distributor can provide technical support. Press SILENCE on the touchscreen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2/PDU system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 135 The alarm has triggered a message to be sent to the modem, if so configured. If configured to be a latching alarm, press RESET on the display. If you are accessing the Liebert STS2/PDU system from a terminal, type CA and press RETURN on your keyboard.
  • Page 136 The alarm has triggered a message to be sent to the modem, if so configured. If configured to be a latching alarm, press RESET on the display. If you are accessing the Liebert STS2/PDU system from a terminal, type CA and press RETURN on your keyboard.
  • Page 137 The alarm has triggered a message to be sent to the modem, if so configured. If configured to be a latching alarm, press RESET on the display. If you are accessing the Liebert STS2/PDU system from a terminal, type CA and press RETURN on your keyboard.
  • Page 138 Circuit Breaker 1 failed to trip open when the control issued a command for the circuit breaker to trip. Press SILENCE on the touchscreen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2/PDU system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 139 Vertiv-authorized distributor can provide technical support. Press SILENCE on the touchscreen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2/PDU system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 140 The load of the Liebert STS2/PDU has been transferred to Source 2. Press SILENCE on the touchscreen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2/PDU system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 141 Point under User Settings. An S1 Fail alarm was also issued and source transfer has been inhibited. Press SILENCE on the touchscreen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2/PDU system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 142 The load of the Liebert STS2/PDU has been transferred to Source 1. Press SILENCE on the touchscreen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2/PDU system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 143 S1 OVERCURRENT Source 1 Overcurrent Liebert STS2/PDU is running on Source 1 and an overload condition has occurred on one or more phases. Note: The overload setpoint is a single fixed number—101%. An overload condition is detected when the measured load current is equal to or greater than the setpoint.
  • Page 144 Transferring to Source 1 has been inhibited. Press SILENCE on the touchscreen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2/PDU system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 145 LOAD ON ALT SOURCE Liebert STS2/PDU load on the alternate source. The Liebert STS2/PDU is running on the alternate power source. Check the Event Log to determine the reason for the transfer from the preferred source. Another event has caused the system to transfer to the alternate source. The system returns the load to the preferred source either automatically or manually, depending on how the system is configured.
  • Page 146 Check that the Circuit Breaker 2 switch is in the desired position. Press SILENCE on the touchscreen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2/PDU system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 147 Liebert STS2/PDU. Press SILENCE on the touchscreen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2/PDU system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 148 This event was also written to the Event Log, if so configured. Press SILENCE on the touchscreen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2/PDU system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 149 Vertiv-authorized distributor can provide technical support. Press SILENCE on the touchscreen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2/PDU system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 150 Vertiv-authorized distributor can provide technical support. Press SILENCE on the touchscreen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2/PDU system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 151 Vertiv-authorized distributor can provide technical support. Press SILENCE on the touchscreen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2/PDU system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 152 Digital Input option board. Press SILENCE on the touchscreen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2/PDU system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 153 Digital Input option board. Press SILENCE on the touchscreen to turn off the audible alarm, if so configured. If you are accessing the Liebert STS2/PDU system from a terminal, type SH and press RETURN on your keyboard to turn off the audible alarm.
  • Page 154 Transfer counter reset to 0 Contact technical support; in the United States, call 800-543-2378. Outside the 48 contiguous United States contact Vertiv Services, if available in your area. For international areas not covered by Vertiv Services, the Vertiv-authorized distributor can provide technical support.

  • Page 155: Maintenance

    The unit is supplied by multiple AC power sources. Disconnect and lock out all power sources before working inside unit. Minimal periodic maintenance of the Liebert STS2/PDU is required. As with all electrical distribution components, the system should be regularly inspected for electrical connection integrity, signs of excessive temperatures, dirt accumulation and proper system operation.

  • Page 156: Customer Settings

    (10) events can be programmed to each channel. See 6.1 - Programmable Relay Board for more information on the PRB. If your Liebert STS2/PDU has the PRB option installed, list the settings below for future reference. If control power is lost in the Liebert STS2/PDU, the settings are not saved.
  • Page 157 Table 32 Programmable relay board settings record (continued) Channel 7 Channel 8 Channel 9 Channel 10 PRB Notes Vertiv | Liebert® STS2/PDU ™ User Manual | Rev. 6 | 10/2017 ™...

  • Page 158: Input Contact Isolator Settings

    Liebert STS2/PDU’s alarm network. See 6.2 - Input Contact Isolator Board for more information on the ICI. If your Liebert STS2/PDU has the ICI option installed, list the settings below for future reference. If control power is lost in the Liebert STS2/PDU, the settings are not saved.
  • Page 159 TECHNICAL SUPPORT / SERVICE Web Site www.vertivco.com Monitoring liebert.monitoring@vertivco.com 800-222-5877 Outside North America: +00800 1155 4499 Three-Phase UPS & Power Systems 800-543-2378 Outside North America: 614-841-6598 LOCATIONS United States 1050 Dearborn Drive P.O. Box 29186 Columbus, OH 43229 Europe Via Leonardo Da Vinci 8 Zona Industriale Tognana 35028 Piove Di Sacco (PD) Italy +39 049 9719 111...
  • Page 160 VertivCo.com | Vertiv Headquarters 1050 Dearborn Drive, Columbus, OH, 43085, USA Vertiv and the Vertiv logo are trademarks or registered trademarks of Vertiv Co. All other names and logos referred to are trade names, trademarks or registered trademarks of their respective owners.

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