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AFDK-SVU01C-EN
Input Power and Control Wiring
Wire Sizing
Care should be taken to see that all interconnection wiring
and ground wiring is sized and installed in conformance
with the National Electrical Code (NEC), the National Fire
Protection Association (NFPA), or the Canadian Electrical
Code (CEC) as applicable, and other appropriate local
codes. Refer to controller and motor nameplates for
electrical data. Refer to
for the cable ranges
of the input power circuit breaker and
for
cable rages of the remote-mounted drive’s output wiring.
Cabinet Wire Routing
All wiring should be installed in conformance with the
applicable local, national, and international codes (for
example, NEC/CEC). Control wiring enters the cabinet
through the right side and terminates at the control panel’s
terminal block. Tighten the control wire connections to
7.1 to 8.9 in·lb (0.8 to 1.0 N·m).
Torquing Electrical Power Connections
Use a torque wrench to tighten power connections. A
torque wrench eliminates the human element and
provides proper hardware tightening.
Proper torque for connections depends on both the
bolting materials and the metals being connected. Strand
migration will occur when the copper is under prolonged
pressure.
Electrical power terminations should be rechecked for
tightness when the apparatus is first installed and
periodically afterwards. The conductor could flow under
prolonged pressure. Thermal cycling will be greater
during the first few months in operation.
Most hardware used for making a bolted electrical joint
will be low carbon steel. The hardware does not carry
electrical current but holds the two conducting surfaces
together under pressure. When properly torqued, the
slight elongation of the bolt or screw acts to maintain
pressure on the electrical joint. The thermal expansion of
steel is less than that of the conducting metals, which is
usually copper.
The pressure at the electrical joint will vary slightly during
thermal cycling and reduces somewhat when there is cold
flow in the conducting metals. Re-torquing will re-
establish the surface pressure, which is essential to
keeping a low resistance drop between the two
conducting surfaces and avoiding eventual failure.
NOTICE
Equipment Damage!
When tightening connections at the drive terminals,
take care not stress the IGBTs. The IGBTs are
connected to the other end of the terminal bar, and
stressing them could cause equipment damage.
Installing Input Power Wiring Standard
Cabinet
Use the following steps to connect ac input power to the
cabinet:
WARNING
Hazardous Voltage w/Capacitors!
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 an appropriate voltmeter that all
capacitors have discharged. Failure to disconnect
power and discharge capacitors before servicing could
result in death or serious injury.
For additional information regarding the safe discharge of
capacitors, see PROD-SVB06A-EN
NOTICE
Line Side Wiring!
The electrical wiring from the drive output to the motor
must be routed through the magnetic cores. The cores
are used to protect the motor bearings. Failure to route
the wires through the cores could result in bearing
damage.
1. Turn off, lock out, and tag the input power to the drive.
2. Remove the input wiring access panel from the top left
of the drive enclosure. Refer to
,
, and
the exact location and dimensions of the input wiring
access panels.
NOTICE
Equipment Failure!
Do not cut holes in Adaptive Frequency™ Drive
enclosure. Debris falling inside of Adaptive Frequency
Drive could cause failure of electronic components.
Failure to follow this precaution could result in
damaged equipment.
Table 15. Torque value for AFDK output to motor
Bolt Size
Torque Value
3/8 in.
30 ft·lb (40.7 N·m)
