If the 7–segment LED, LEDM1, is not lit when the 24–V power is turned
on, check LEDM2, the red LED on the front of the controller.
When LEDM2 is lit, the fuse for the Power Mate is blown.
(1) FUS1 (fuse in the controller) has blown.
(a) Input power voltage is too high.
(b)External 24DCV power supply is faulty.
(c) 24–V power line short–circuit (line–to–line or line–to–ground)
(2)Input voltage is low
Make sure that the voltage across the 0 V and 24 V pins of connector
CP2 is 24 VDC ±10% as measured using a volt–ohm–millimeter. (See
If it is not normal, check machine side magnetics circuit.
(3)Power supply unit in controller is faulty.
If LEDM1 does not light even when the input voltage measured in step
(2) is normal (24 V), it is likely that the base printed–circuit board in
the controller is defective.
(4)Power leakage from other units
Disconnect all cables other than the power cable of the Power Mate,
then retry. When no defective condition is encountered, connect the
cables one by one to determine which one causes a failure.
Then, remove the failure (such as short between +5–V lines).
POWER CANNOT BE
Causes and Remedies