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Wiring
Input Power, Input Starter to Drive Panel,
Drive to Motor, and Control Wiring
This section explains the required field wiring for each
chiller motor and drive.
Note: For Duplex™ chillers, this will be required for both
Circuit 1 and Circuit 2.
For AWG/MCM equivalents in mm
Table 4.
Wire sizing reference
2
AWG/MCM
mm
equivalent
22
0.32
21
0.35
20
0.5
18
0.75
17
1.0
16
1.5
14
2.5
12
4
10
6
8
10
6
16
4
25
2 or 1
35
1/0
50
2/0
70
2/0 or 3/0
95
4/0 or 250
120
300
150
350 or 400
185
450 or 500
240
Note: AWG = American Wire Gauge
Important:
Customers are responsible for all field
wiring in compliance with local, national,
and/or international codes.
42
2
, refer to
Table
4:
Installing Input Power Wiring
Standard Cabinet
Use the following steps to connect AC input power to the
cabinet:
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious injury.
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. For variable frequency drives
or other energy storing components provided by Trane
or others, refer to the appropriate manufacturer's
literature for allowable waiting periods for discharge of
capacitors. Verify with a CAT III or IV voltmeter rated
per NFPA 70E that all capacitors have discharged.
Important:
•
Before servicing, disconnect all power sources and
allow at least 20 minutes for capacitors to discharge.
•
All electrical enclosures-unit or remote-are IP2X.
•
Before working on equipment, check for the Status of
LED 6: 50Vdc indicator on each Power Cell. When ON,
the DC Bus inside the Power Cell has > 50Vdc.
•
1. Turn off, lock out, and tag the input power to the drive.
2. Remove the plate from the section of the drive
enclosure where the wires will enter.
NOTICE
Equipment Failure!
Debris falling inside of adaptive frequency drive could
cause failure of electronic components which could
result in damaged equipment.
Do not cut holes in adaptive frequency drive enclosure.
3. Once removed, drill the wire routing holes in the panel.
These wire routing holes are the only entry points for
input power wiring into the cabinet.
4. Install the appropriate conduit hubs.
5. Reinstall the cabinet's panel.
6. Connect the three-phase input power leads to circuit
breaker terminals L1, L2, and L3. Tighten these
connections to 30 ft·lb (40.7 N·m). Use only copper-
conductors for the input power leads Input power
wiring should be copper and should be sized according
to applicable codes to handle the drive's continuous
rated input current.
VFDB-SVX001A-EN
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Troubleshooting
