Construction Mode
2-18 Manual # 42-02-7223
Verifying Main Line Power and Wiring the Controller
1. Consult the job prints. Check the line side of the main disconnect to see that all three
legs are at the correct voltage. Compare this voltage with the primary voltage on the data
plate for the drive isolation transformer (must be within 10% of this value).
Proper motor branch circuit protection in the form of a fused disconnect switch or circuit
breaker must be provided for each elevator according to applicable electrical code. Each discon-
nect or breaker must be clearly labeled with the elevator number. The electrical contractor must
determine the wire size for the main AC power supply and for the wiring from the disconnect or
breaker to the drive isolation transformer.
2. If the car is part of a group, the cars in the group must be wired to provide power to the
group cabinet. If this is the case, refer to the Group Supervisor Field Wiring print in the
job prints. Group power is provided by the car controllers as shown in drawing -2. The
main AC power supply wiring size must be determined by the electrical contractor.
2a. Check the phase-offset of the individual car ST2-bus lines before connecting them
to the Group cabinet. Use a voltmeter set to AC volts to measure between adjacent
car ST2-bus terminals in the Group cabinet. The meter must read less than
10VAC. If the reading is higher, reverse the power leads going to the car T1 trans-
former at L1 and L2 and measure again.
All 2 bus power from car to Group cabinets must be in phase. Connecting out-of-phase power
WILL cause damage.
2b. A separate conduit or wiring trough must be provided for the System (car-to-car)
Ethernet network. Wiring is fully detailed in the job prints. These details must be
followed exactly.
2c. If applicable, also wire according to the Group Interconnects to Individual Car
Cabinets print. Be sure to ground all cabinets according to instructions.
2d. Refer to the iCentral (Group Supervisor) Field Wiring Print for Group Controller
field wiring instructions.
3. Connect AC supply wiring to the isolation transformer, and wiring from the transformer
to the controller exactly as shown in the job prints.
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