TCI KMG - Manual (Page 23)

23
Figure 4 – Typical Connection Diagram
Grounding
The MotorGuard panel equipment grounding lug must be connected to the ground of the premises
wiring system. The equipment grounding connection must conform to the requirements of the National
Electric Code (NEC) and/or any other codes that apply to the installation site. The ground connection
must be made using a wire conductor. Metallic conduit is not a suitable grounding conductor. The
integrity of all ground connections should be periodically checked.
Power Wiring
Connect the output of the VFD, terminals T1(U), T2(V), & T3(W), to the input of the MotorGuard,
terminals U, V, & W. Connect the motor to the output of the MotorGuard, terminals T1, T2, & T3.
Caution Use wire that is appropriate for the voltage and current rating of the motor.
For units rated less than 100 amps, use copper or aluminum wire with an insulation temperature rating
of 60 °C or higher.
For units rated 100 amps or more, use copper or aluminum wire with an insulation temperature rating
of 75 °C or higher.
The wire size and the voltage ratings must conform to the requirements of the National Electrical
Code and/or other applicable electrical codes.
Be sure to also follow the motor wiring instructions provided in the instruction manual for the VFD.
Control Wiring (for units with boards)
Connect control power to the MotorGuard. Be sure to provide fuses or other appropriate protection for
the control power wiring. Make sure that the voltage and VA capacity of the control power source
matches the MotorGuard's control power input ratings. Refer to the drawings shipped with the unit.
Connect the MotorGuard fault output relay contacts to the appropriate fault monitoring circuit. It may
be connected to the VFD or to some supervisory control or alarm annunciation equipment.
T1
T2
T3
G
Motor
U
V
W
G
T1
T2
T3
MotorGuard
6 7 8
Fault
Output
L1 L2
Control
Power
L1(R)
L2(S)
L3(T)
G
(U)T1
(V)T2
(W)T3
G
Ext Fault
Input
Variable
Frequency
Drive