WeP LQ540DX User Manual page 6

In case of your site condition not meeting the above limits, you must go for a
voltage stabilizing equipment, which will ensure regulated supply of voltage to
your printer.
You may install
i. Servo voltage stabilizer with high/low trip unit.
ii. CVT (Constant Voltage Transformer)/Line conditioner.
iii. UPS (Uninterrupted Power Supply).
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