Nortel QUAA3 Maintenance Manual
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Nortel QUAA3 Maintenance Manual

Nortel QUAA3 Maintenance Manual

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Meridian 1
QCA144 1.5 MB/S Remote Peripheral
Equipment Cabinet Appendix A
Maintenance and equipment replacement
Document Number: 553-2601-500A
Document Release: Standard 2.0
Date: December 1994
Year Publish FCC TM
© 1987, 1994
All rights reserved
Printed in the United States of America
Information is subject to change without notice. Northern Telecom reserves the right to make changes in design
or components as progress in engineering and manufacturing may warrant. This equipment has been tested
and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC rules.
SL-1 and Meridian 1 are trademarks of Northern Telecom.
QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement

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  • Page 1 Meridian 1 QCA144 1.5 MB/S Remote Peripheral Equipment Cabinet Appendix A Maintenance and equipment replacement Document Number: 553-2601-500A Document Release: Standard 2.0 Date: December 1994 Year Publish FCC TM © 1987, 1994 All rights reserved Printed in the United States of America Information is subject to change without notice.
  • Page 2 Revision history February 2, 1988 Version 1.0. This appendix is reissued to remove references to rectifiers other than the QRF12 –48 rectifier supplied with the cabinets. Changes to the practice are indicated by a vertical bar in the margin next to the affected item. December 1994 Standard, release 2.0.

  • Page 3: Table Of Contents

    Contents General ........Fault detection and locating ....Overlay programs .
  • Page 4 List of figures Figure 1 Battery cell connections ........Figure 2 Expansion battery unit connections .
  • Page 5 List of tables Table 1 Alarm indications ......... Table 2 Fault indicators and possible causes .

  • Page 6: General

    Page 1 of 34 General This appendix describes maintenance and equipment replacement procedures for the QCA144 Remote Peripheral Equipment (RPE) cabinet and related equipment. Fault clearing for the RPE housed in the QCA144 cabinet is described in Remote Peripheral Equipment maintenance procedures (553-2601-500). QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement...

  • Page 7: Fault Detection And Locating

    Page 3 of 34 Fault detection and locating Overlay programs Overlay programs are used to detect most faults in the QCA144 cabinet. These programs are described in Remote Peripheral Equipment maintenance procedures (553-2601-500). Alarm indications RPE related alarms are described in Remote Peripheral Equipment maintenance procedures (553-2601-500).
  • Page 8 Page 4 of 34 Fault detection and locating Table 1 Alarm indications (Part 1 of 2) Trouble indicator Type of fault CE/PE1 PE 2-5 RECT CE LN ATT MJ PE 2-5 ALARM ALARM LN XFR LN XFR +5 V +12 V +10 V +6 V (Note)
  • Page 9 Fault detection and locating Page 5 of 34 Table 1 Alarm indications (Part 2 of 2) Trouble indicator Type of fault CE/PE1 PE 2-5 RECT CE LN ATT MJ PE 2-5 ALARM ALARM LN XFR LN XFR PE power from second and (Note) third tier PE...
  • Page 10 — Check LN XFR switch on faceplate of QUAA3 unit and ensure that it is set to 0. Wait 2 minutes for fault indication to clear. — Press –48 V CLR button on QUAA3 unit. If fault does not clear, replace the following items until fault clears: •...
  • Page 11 Fault detection and locating Pag e 7 of 34 Tab le 2 Fault indicato r s and possib le causes ( Par t 2 of 2) Fault indication Possi b le cause LED Extinguished on — Che c k for tripped brea k er on Q UX20 unit. QPC706 P ower —...
  • Page 12 Page 8 of 34 Fault detection and locating Procedure 1 CE/PE1 breaker on QUX19 unit trips Step Action Verification Reset breaker. If breaker does not trip, fault has cleared. If breaker trips, proceed with next step. Unseat the QPC659 buffer pack in the PE If breaker trips, replace power distribution shelf in the first tier (base) of the cabinet.
  • Page 13 — The –48 V rectifier — The batteries (if equipped) — The QBL24 battery box (if equipped) — The QUAA3 power unit — The QUX19 power unit — The QUX20 power unit (if equipped) Disconnect red and black wires from If breaker trips, replace defective –48 V...
  • Page 14 QUAA3 unit. Note: When not equipped with cooling units, the cable from the QUX19 unit should be connected to J7 on the QUAA3 unit. When cooling units are equipped, J7 is connected to the cabinet wiring leading to the cooling units.

  • Page 15: Equipment Replacement

    Battery replacement—Procedure 5 — Expansion QBL24 Battery Unit replacement—Procedure 6 — Main QBL24 Battery Unit replacement—Procedure 7 — QUAA3 Power Unit replacement—Procedure 8 — QUX19 Power Unit replacement—Procedure 9 — QUX20 Power Unit replacement—Procedure 10 — Power Distribution Cable replacement—Procedure 11 —...
  • Page 16 Page 12 of 34 Equipment replacement Procedure 5 Battery replacement CAUTION Service in the cabinet is interrupted when replacing the batteries. Set the AC BRKR breaker on the front of the –48 V rectifier and the CAB INP breaker on the front of the QUX19 unit to OFF. Set the DC BRKR breaker on the QBL24 battery units serving the cabinet to OFF.

  • Page 17: Figure 1

    Equipment replacement Page 13 of 34 Figure 1 Battery cell connections Battery packs Front of QBL24 unit Black interconnecting Black wire wires – – to QBL24 Unit – Red wire to QBL24 Unit Battery packs – and + connections on each battery pack Flexible conduit for power and control wiring...
  • Page 18 Page 14 of 34 Equipment replacement With three black jumper wires, connect the four battery packs in series (Figure 1). Connect the large lug on the black wire to the terminal of the first battery pack. Connect the small lug on the wire to the negative (–) terminal on the second battery pack.
  • Page 19 Equipment replacement Page 15 of 34 Remove the screws securing the cover on the main QBL24 battery unit and remove cover (Figure WARNING The battery cells are capable of delivering high currents when externally short-circuited. Caution must be used when working near the open terminals of the batteries to ensure that the terminals are not inadvertently short-circuited.

  • Page 20: Figure 2

    Page 16 of 34 Equipment replacement Figure 2 Expansion battery unit connections Black wire Green wire Shield Expansion QBL24 Battery Unit Red wire Inside View of Front Panel Main QBL24 Battery Unit BRKR QCAD301 Cable from Expansion QBL24 Unit – BRKR Remove plug QBL24...
  • Page 21 Equipment replacement Page 17 of 34 Procedure 7 Main QBL24 Battery Unit replacement CAUTION Service in the cabinet is interrupted when replacing the main QBL24 battery unit. Set the AC BRKR breaker on the front of the –48 V rectifier to OFF in the cabinet connected to the QBL24 battery unit being replaced.

  • Page 22: Figure 3

    Red and back DC ON Commercial long red and black wires from connection power connections battery unit (Note) Ground bar QUX19 QRF12 Rectifier QUAA3 (Note) • Line 1 Neutral 2 • Terminal Straps for BK R batteryless + OUT operation only...
  • Page 23 From the front of the cabinet, remove the two bolts securing the right bottom of the QUAA3 unit to the cabinet. Remove the two screws securing the left side of the QUAA3 unit to the cabinet and remove unit from cabinet.
  • Page 24 At the rear of the QUAA3 unit, reconnect connectors J1, J2, J3, J4, J5, J6, and J7. On TB4 at rear of QUAA3 unit, reconnect wires to terminals 1, 2, 3, 4, 5, and 6. If previously removed, reinstall EMI shield at rear of cabinet and secure with mounting screws.
  • Page 25 (Figure At the rear of the QUAA3 unit, disconnect cable connectors P1, P5, P6, and P7 and wiring from terminals 1, 2, 3, 4, 5, and 6 of TB4. At the rear of the QUX19 unit, tag and disconnect power wiring from TB1 and P10 wiring from TB2.
  • Page 26 Connect connector PE to connector J on backplanes. Connect power wiring harness containing three red wires, two blue wires, and a black wire to TB4 at the rear of the QUAA3 unit as follows: — The two 10 AWG red wires to terminals 1 and 2.

  • Page 27: Figure 4

    Equipment replacement Page 23 of 34 Figure 4 Cabinet top assembly Screws Louvered top assembly Two additional louvers Thermostat to accomodate cooling units Top panel Cooling units Optional Additional Shelf Optional Additional Shelf Base Cabinet Front V ie w of Ca bine t 553-1141 QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement...
  • Page 28 Page 24 of 34 Equipment replacement Procedure 10 QUX20 Power Unit replacement CAUTION Service in the cabinet is interrupted when replacing the main QUX20 power unit. Set the breakers on the faceplate of the QUX20 unit to OFF. Set the CAB INP breaker on the QUX19 unit to OFF. If equipped, remove the lower EMI shield from the rear of the cabinet.
  • Page 29 Perform this step only if the power cable serving the first tier is being replaced. — Disconnect connector P3 from the rear of the QUAA3 unit. — Disconnect red and blue wires from terminals 2 and 3 of TB5 at the rear of the QUX20 unit.
  • Page 30 Perform this step only if the power distribution cable for the third tier is being replaced. — Disconnect connector P4 and P7 from the rear of the QUAA3 unit. — Disconnect red and blue wires from terminals 4 and 5 of TB5 at the rear of the QUX20 unit.
  • Page 31 — Disconnect the QCAD278 cable from terminal 2 of TB2 on the QUX19 unit, connector P2 at the rear of the QUAA3 unit and from the lug on the ground bus. — Remove cable.
  • Page 32 Page 28 of 34 Equipment replacement Procedure 14 QPC706 Power Converter Circuit Pack replacement CAUTION The appropriate breaker must be OFF before attempting to replace a QPC706 converter pack. See Figure 5 for breaker assignments. See 553-2301-511 and load overlay 32 and disable loops on shelf containing the QPC706 converter.

  • Page 33: Figure 5

    RPE SHLF X-LP__SH_ PE SHLF Y-LP__SH_ Shelf position CE/PE1 breaker on QUX19 unit X-6/ X-7/ X-8/ X-9/ X-10/ QUX19 power distribution unit QUAA3 Rectifier power unit QUX20 power distribution unit 2 553-6107 QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement...
  • Page 34 Page 30 of 34 Equipment replacement Procedure 15 QUD24 Cooling Unit replacement Note: QUD24 cooling units are located in the cabinet top panel assembly. Connections given in this chart are typical and may vary from one installation to another. Cooling units are connected in series. Remove the six screws securing the cabinet top panel assembly and remove top (Figure...

  • Page 35: Figure 6

    Equipment replacement Page 31 of 34 Figure 6 Cooling unit connections CU1 connector at rear of cabinet Mounting Hole in Mounting QCAD303 Power Cable screws panel Cabinet top panel screws (Note) QUD24 Cooling Units Rear connectors QCAD304 Terminating Plug (Note) Front connectors 553-1142 Mounting...
  • Page 36 Page 32 of 34 Equipment replacement Procedure 16 QRF12 Rectifier replacement CAUTION Service in the cabinet is interrupted when replacing the rectifier unless battery backup is provided. Set AC BRKR breaker on the front of the rectifier to OFF. Disconnect rectifier commercial power line cord from its receptacle. If equipped, remove the bottom EMI shield.
  • Page 37 Equipment replacement Page 33 of 34 Procedure 17 Peripheral Equipment Shelf Backplane replacement Log in to the system and load overlay program 32 as described in 553-2301-511. Disable the PE shelf being replaced using command DISS 1 s, where 1 is the loop number and s is the shelf number. Note: If the loop is extended to a second PE shelf, that shelf must also be disabled.
  • Page 38 Page 34 of 34 Equipment replacement If previously removed, reinstall EMI shield and secure to cabinet with mounting screws. Reconnect all cables previously disconnected from connectors on shelf backplanes. Reinsert all circuit packs previously unseated. Reinsert PE1 fuse (if removed) on QUX19 unit or set PE breaker on QUX 20 unit for replaced backplane to ON.
  • Page 39 Family Product Manual Contacts Copyright FCC notice Trademarks Document number Product release Document release Date Publish Meridian 1 QCA144 1.5 MB/S Remote Peripheral Equipment Cabinet Appendix A Maintenance and equipment replacement © 1987,1994 Northern Telecom All rights reserved Information is subject to change without notice. Northern Telecom reserves the right to make changes in design or components as progress in engineering and manufacturing may warrant.
  • Page 40 Family Product Manual Contacts Copyright FCC notice Trademarks Document number Product release Document release Date Publish Copyright Statement © 1998 Northern Telecom All rights reserved Information is subject to change without notice. Northern Telecom reserves the right to make changes in design or components as progress in engineering and manufacturing may warrant.

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