Series 90-30 Plc Equipment Grounding; Baseplate Safety Grounding - GE 90-30 PLC Series Installation And Hardware Manual

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Series 90-30 PLC Equipment Grounding

Equipment grounding recommendations and procedures are listed below. These grounding
procedures must be properly followed for safe, proper operation of your Series 90-30 PLC system.

Baseplate Safety Grounding

The following recommendations are offered, but applicable safety codes for your area or equipment
type should also be consulted. The baseplate's metal back must be grounded using a separate
conductor; the baseplate mounting screws are not considered to an acceptable ground connection
by themselves. Use a minimum AWG #12 (3.3 mm
washer under the head of one of the baseplate's two lower mounting holes. These two holes have
openings to the side to allow connecting a wire and ring terminal under the head of a mounting
screw. Connect the other end of this ground wire to a tapped hole in the panel that the baseplate is
mounted to, using a machine screw, star lock washer, and flat washer. Alternately, if your panel
has a ground stud, it is recommended you use a nut and star lock washer for each wire on the
ground stud to ensure adequate grounding. Where connections are made to a painted panel, the
paint should be removed so clean, bare metal is exposed at the connection point. Terminals and
hardware used should be rated to work with the aluminum baseplate material.
AWG #12 or
Larger Wire
Figure 2-11. Baseplate Grounding
2-12 Series 90-30 PLC Installation and Hardware Manual – August 2002
PROGRAMMABLE
CONTROLLER
BASE 5-SLOT
CAUTION
USER PROGRAM
AND REGISTER
VALUES MAY BE
LOST IF POWER
SUPPLY IS
REMOVED FOR
LONGER THAN
1 HOUR
POWER
SUPPLY
Screw, Star Lock washer,
Flat Washer, Ring Terminal,
installed in tapped hole.
Paint Removed
From Panel Here
All baseplates must be grounded to minimize electrical shock hazard.
Failure to do so can result in severe personal injury.
2
) wire with a ring terminal and star lock
NON-CPU SLOTS
I/O-2 I/O-3
CPU/1
Warning
E
X
P
A
N
S
I
O
N
I/O-4 I/O-5
Alternate location
for Ground connection
GFK-0356Q