Installation
2-8 42-02-2M01 A1
• The chosen ground must conform to all applicable codes. Proper grounding is essential for
system safety and helps to reduce noise-induced problems.
• Direct, solid grounding must be provided in the machine room to properly ground the con-
troller and the motor.
Figure 2.2 Ground Wiring to Controller Cabinet
1. An uninterrupted ground wire should be run from each car controller cabinet chassis or
back plate to earth ground. The connection at the car controller must be free of paint so
connection is made to bare metal. There should be less than 1-ohm to ground with the
power off.
2. Ground straps, or short loops of ground wire, should be run from the controller ground
connection to the primary duct connections.
3. An uninterrupted ground wire should be run from the hoist motor frame to the control-
ler ground. The ground connection to the hoist motor must be free of paint.
4. An uninterrupted ground wire should be run from a termination point on the cab to the
controller ground.
5. An uninterrupted ground wire should be run from the cab enclosure to the ground ter-
minal on the cab to protect passengers from electrical shock.
6. An uninterrupted ground wire should be run from each car operating panel to the
ground terminal on the cab to protect passengers from electrical shock.
7. An uninterrupted ground wire should be run from the dispatch cabinet chassis or back
plate to earth ground. The connection must be to the bare metal of the enclosure.
Check for Shorts to Ground
Check for shorts to ground before powering up the system. Power must be OFF at the main
disconnect. If any shorts to ground are discovered, they must be corrected before proceeding.
A short to ground is defined as having a resistance of less than 20 ohms between ground and the
terminal being tested.
Be certain that power is OFF at the main disconnect before proceeding.
1. Disengage all 2 Bus fuses.
2. Measure the resistance between the 1 Bus (common) and all field connection terminals.
3. Check for shorts to ground on motor power terminals L1, L2, and L3.
4. Check for shorts to ground on brake terminals B1 and B2, EB1, and EB2 (as applicable).
5. If no shorts to ground are discovered, re-engage the fuses.
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