General Wiring Guidelines
2-9
Ground Wiring
To obtain proper grounding, quality wiring materials and methods should be used.
All grounding in the elevator system must conform to all applicable codes. Proper grounding is
essential for system safety and helps to reduce noise-induced problems. The following are some
grounding guidelines:
• The grounding wire to the equipment cabinet should be as large as, or larger than, the pri-
mary AC power feeders for the controller and should be as short as possible.
• The grounding between equipment cabinets may be branching or a daisy chain, but the
wire must terminate at the last controller and NOT loop back (see Figure 2.1).
Figure 2.1 Ground Wiring to Controller Cabinets
• Direct solid grounding must be provided in the machine room to properly ground the con-
troller and the motor. Indirect grounding, such as the building structure or a water pipe,
may not provide proper grounding and could act as an antenna radiating RFI noise, thus,
disturbing sensitive equipment in the building. Improper grounding may also render an
RFI filter ineffective.
• The conduit containing the AC power feeders must not be used for grounding.
Main AC Power
Main AC power supply wiring size must be determined by the electrical contractor. Proper
motor branch circuit protection must be provided according to applicable electrical codes in the
form of a fused disconnect or circuit breaker. Each disconnect or breaker must be clearly
labeled with the elevator number.
Pump Motor Wiring
Connect the pump motor for the proper configuration shown on the wiring diagrams. Connect
the pump motor leads to the proper terminals on the controller.
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