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Installation Precautions Section 4-2
4-2 Installation Precautions
When installing the CQM1H in a control panel, observe the following points.
Ambient Temperature
The ambient temperature range in which the CQM1H can be used is 0 to
55
°C (0 to 45°C if a Programming Console is connected to the CPU Unit).
Use the CQM1H in a well-ventilated area.
Do not mount the CQM1H directly above heaters, transformers, large-capac-
ity resistors, or any other devices that radiate a large amount of heat energy.
If the ambient temperature is higher than 55
°C, install a fan or cooler as
shown in the above diagram so that the temperature is maintained at a maxi-
mum of 55
°C.
Maintenance Do not install the CQM1H close to high-voltage or power devices.
External Wiring Observe the following precautions for external wiring.
• When multi-conductor signal cable is being used, avoid combining I/O
wires and other control wires in the same cable.
• If wiring racks are parallel, allow at least 300 mm (12 inches) between the
racks.
• Run CQM1H power supply lines and power cables (400-V/10-A max. or
220-V/20-A max.) as shown in the following diagram.
Control panel
Fan
CQM1H
Louver
Low-current cables
Control cables
Power cables
300 mm min.
300 mm min.
Ground to 100 Ω or less
PC I/O wiring
PC power supply and
general control circuit wiring
Power lines
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