Installation
3
Installation
This section contains:
• Equipment grounding
•AC connections
•Initial power up
• Field connections
Equipment Grounding
For good grounding, quality wiring materials and methods must be used. Grounding must con-
form to all applicable codes. Proper grounding is essential for system safety and helps to reduce
noise-induced problems. General grounding guidelines include:
• The grounding wire to the equipment cabinet should be the same gauge (diameter) or
larger than the primary AC power feeders for the controller and should be as short as pos-
sible.
• The grounding wire between equipment cabinets may follow a branching or daisy-chain
configuration, but the wire must terminate at the last controller and NOT loop back.
• You must provide a direct, solid ground to the controller and motor. An indirect ground,
such as the building structure or a water pipe, may not provide proper grounding and
could act as an antenna — radiating RFI noise and interfering with electronic equipment
in the building.
• The conduit containing the AC power feeders must not be used for grounding.
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 fuses at the bottom of the cabinet.
2. Measure the resistance between the cabinet ground and all field connection terminals
(connectors J1 through J4 and J6 through J9 on the EC-MCB board and J1 through J4
on the EC-SCB board).
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 where applica-
ble).
5. If no shorts to ground are discovered, re-engage the fuses. Refer to the job prints for fuse
location if necessary.
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