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Input Power and Control Wiring
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 an appropriate voltmeter that all
capacitors have discharged.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06*-EN
NOTICE
Load Side Wiring!
Failure to route the wires through the cores could result
in bearing damage. 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.
1. Turn off, lock out, and tag the input power to the drive.
2. Load wires from the drive to the motor must be routed
through the common mode choke.
NOTICE
Equipment Failure!
Failure to follow instructions below could result in
damaged equipment. Do not cut holes in adaptive
frequency drive enclosure. Debris falling inside of
adaptive frequency drive could cause failure of
electronic components.
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.
7. Tighten connections to 30 ft·lb (40.7 N·m). Use only
copper conductors for the input power leads.
AFDG-SVU01L-EN
Input power wiring should be copper and should be
sized according to applicable codes to handle the
drive's continuous rated input current.
Refer to submittals for power lug sizes and location along
with control wiring specifics for the controller.
Important:
Power connections should be re-torqued
after the first three to six months of
operation and on an annual basis thereafter.
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.
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 left 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).
Wire Routing
Note: Wiring from the drive to the motor is required to be
routed through the magnetic cores (as illustrated in
Figure 8, p.
21).
19
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