!
!
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26
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
2-5-2 DC Power Supply Unit Wiring
The following diagram shows the proper connection to a DC power supply. Refer
to 2-2-3 Selecting a Power Supply Unit for details on Power Supply Unit capacity.
Remove the seal from the top of the Power Supply Unit only after wiring is com-
pleted. This seal must be removed before operating the Unit to prevent over-
heating.
DC power supply
Use power lines of 2 mm min.
Twist
Breaker
Caution Be sure that the DC power supply voltage remains within the allowed fluctuation
range of 20 to 28 VDC.
Terminal Block The following diagram shows the terminal blocks for the DC Power Supply Unit.
CQM1-PD026
DC
input
Provide a 24-VDC
power supply.
NC
NC
Noise filter neutral terminal
Protective earth terminal
The wire used should be at least 2 mm
2
. Provide the grounding point as close to
the CQM1 PC as possible.
Note To satisfy the EC directives (low-voltage directive), provide reinforced insulation
or double insulation for the power supply.
Wiring and Connections
Section 2-5
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