Check First When You Have A Trouble; Troubleshooting - Mitsubishi Electric FR-PU04 Instruction Manual

5

CHECK FIRST WHEN YOU HAVE A TROUBLE

5.1

Troubleshooting

If a fault occurs and the inverter fails to operate properly, locate the cause of the fault and take proper
corrective action by referring to the troubleshooting below. If the corresponding information is not found in
the table, the inverter has problem, or the component parts are damaged, contact your sales
representative.
Status
The LCD or backlight of the
parameter unit does not light.
The "MITSUBISHI" display
remains on and it will not
accept operation.
79
Possible Causes
Connection fault of the
parameter unit
The setting of Pr. 991 PU
contrast adjustment is changed
from the initial value.
The inverter is in the standby
status.
During inverter reset
Connection fault of a cable or
connector
Check Point
Check that the parameter unit
is connected properly.
Or check that the PU cable is
inserted far into the PU
connector.
Check the Pr. 991 setting.
Check whether the PU cable
is disconnected.
Check whether the RES
signal of the inverter is ON.
Check whether RES signal is
ON
Check that no cable damage
nor connection fault of a
connector is found.
Corrective Action
Check the connection of
the parameter unit and
the PU cable.
Return the Pr. 991 setting
to the initial value using
the operation panel.
Check the connection of
the PU cable.
Turn OFF the RES signal
of the inverter.
Turn OFF the RES signal.
Replacement of a cable
Check for a connector
connection