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WARNING LG ( or ):
Noise filter neutral terminal. Short-circuit the LG ( ) terminal and GR ( )
terminals using the attached short-circuit bar and ground them at a resistance of
less than 100 Ω to reduce noise and prevent electric shock.
WARNING GR ( ):
Protective earth terminal. Connect to a separate ground wire of at least 2 mm
2
to
ground the terminal at a resistance of less than 100 Ω to prevent electric shock.
Caution Avoid sharing the grounding wire with other equipment or attaching to the beam
of a building, otherwise it may cause an adverse effect.
CQM1
Other
equipment
CQM1
Other
equipment
Correct Incorrect
2-5-3 Wiring Precautions for Ground Wires
Wire the grounding wires according to the diagram shown below. The CQM1 PC
with the lot number jjZ5 manufactured in December 1995 and later is pro-
vided with the LG-GR short-circuit bar and the DIN-track cable.
In order to improve the electromagnetic compatibility (EMC), connect the LG (
or ) terminal to the screw on the end plate using the supplied DIN-track con-
necting cable.
DIN-track cable
(Supplied with
the CQM1 PC)
Short-circuit bar
(Supplied with the CQM1 PC)
Grounding wire
(Use a wire of at least 2 mm
2
to ground at a resistance of
less than 100 Ω.)
Note Definition of EMC:
The EMC refers to the capacity of equipment represented in terms of emission,
which indicates the degree to which electromagnetic waves produced by equip-
ment do not affect other communications equipment, and also in terms of immu-
nity, which indicates the degree of resistance against electromagnetic distur-
bance.
Wiring and Connections
Section 2-5
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