Rockwell Automation 1560E SMC Flex Smart Motor Controller - Manual (Page 52)

2-4 Installation
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Installation Site (cont.) Grounding Practices
The purpose of grounding is to:
A. Provide safety for Personnel.
B. Limit dangerous voltages to ground on exposed parts.
C. Facilitate proper overcurrent device operation under ground fault
conditions.
D. Provide for electrical interference suppression.
Important: Generally, grounding should be in accordance with the
Canadian Electrical Code (CEC) or National Electrical Code (NEC) and
other local codes.
Each power feeder from the substation transformer to the controller must
be equipped with properly sized ground cables. Simply utilizing the
conduit or cable armour as a ground is not adequate. The conduit or cable
armour and ground wires should be bonded to ground at both ends. Each
enclosure and/or frame must be bonded to ground at a minimum of two
locations.
Each AC motor frame must be bonded to grounded building steel within 20
feet (6.1 m) of its location and tied to the controller’s ground bus by ground
wires within the power cables and/or conduit. The conduit or cable armour
should be bonded to ground at both ends.
Any instruments used for test or troubleshooting should
have their case connected to ground for safety. Failure
to do so may result in damage to equipment or personal
injury.
Recommended Torque Values When reinstalling components or when reassembling the cabinet, tighten
the following bolt sizes to the specified torque values:
1/4-in. hardware 6 ft-lb. (8 N-m)
5/16-in. hardware 12 ft-lb. (15 N-m)
3/8-in. hardware 20 ft-lb. (27 N-m)
1/2-in. hardware 48 ft-lb. (65 N-m)
NOTE: For 3/8 in. hardware in the 'T'-slots of aluminum heatsinks, the
recommended torque is 16 ft-lb (22 N-m). Do not overtorque these
connections as the slots will be damaged and the connection will be
compromised.
A T T E N T I O N A T T E N T I O N