Precaution When Connecting The Uninterruptive Power Supply - Mitsubishi MELSEC- Q Q12PHCPU User Manual

5 POWER SUPPLY MODULE

5.1.3 Precaution when connecting the uninterruptive power supply

5 - 5
(b) Ideas for reducing voltage drops
The following methods are effective to reduce voltage drops at the extension
cables.
1) Changing the module loading positions
Load large current consumption modules on the main base unit.
Load small current consumption modules on the extension base unit.
2) Using short extension cables
The shorter the extension cable is, the smaller the resistance and voltage
drops are.
Use the shortest possible extension cables.
Be sure of the following terms when connecting the Process CPU system to the
uninterruptive power supply (abbreviated as UPS hereafter):
Use a UPS which employs the constant inverter power supply method with 5 % or less
voltage fluctuation.
Do not use a UPS with the constant commercial power supply method.
MELSEC-Q
5 - 5