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Wiring and Connections Section 4-7
DC Power Supply Unit
Wiring
The following diagram shows the proper connections to a DC power supply.
Use a 24-V DC power supply. Refer to 3-2-2 Selecting a Power Supply Unit for
details on Power Supply Unit capacity.
!Caution Be sure that the DC power supply voltage remains within the allowed fluctua-
tion range of 20 to 28 V DC.
Crimp Connectors Use M3.5 crimp connectors of the dimensions shown below for wiring DC
Power Supply Units.
Note Always use crimp connectors for wiring. Do not connect bare stranded wires
directly to terminals.
Terminal Block The following diagram shows the terminal block for the DC Power Supply Unit.
Note 1. The wire used should be at least 2 mm
2
.
2. Provide the grounding point as close to the CQM1H PC as possible.
3. Tighten the terminal screws to a torque of 0.8 N
⋅m.
4. LG ( ):
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.
5. 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.
6. To satisfy the EC directives (low-voltage directive), provide reinforced insu-
lation or double insulation for the power supply.
DC power supply
Use power lines of 2 mm
2
min.
Twist
Breaker
7 mm max.
7 mm max.
CQM1-PD026
DC
input
Provide a 24-V DC power supply.
NC
NC
Noise filter neutral terminal
(see note 4)
Protective earth terminal
(see note 5)
LG
GR
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