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Errors (Alarms)
*2. Functions only when any of Pr. 60 to Pr. 63 (input terminal function selection)
is set to OH.
Operation Panel
Indication
LF FR-PU04 E.LF
Name
Output phase failure protection
Description
This function stops the inverter output if one of the three phases
(U, V, W) on the inverter's output side (load side) opens at motor
start.
Check Point
• Check the wiring (Check that the motor is normal.).
• Check that a motor used is not smaller (two ranks or less) than
an inverter in capacity.
Corrective Action
• Wire the cables properly.
• Set "0" (without output phase failure protection) in H8 "Output
phase failure protection selection" when using a smaller motor
(two ranks or less) than an inverter in capacity.
Operation Panel Indication
OHT FR-PU04 OH Fault
Name
External thermal relay (*2)
Description
If the external thermal relay provided for motor overheat protection
or the internally mounted temperature relay in the motor switches
on (contacts open), the inverter output is stopped. Even if the relay
contacts are reset automatically, the inverter will not restart unless
it is reset.
Check point
• Check for motor overheating.
• Check that the value of 7 (OH signal) is set correctly in any of Pr.
60 to Pr. 63 (input terminal function selection).
Corrective action
Reduce the load and operating duty.
Operation Panel Indication
OLT FR-PU04 Stll Prev STP
Name Stall prevention (overload)
Description
The running frequency has fallen to 0 by stall prevention operation
activated. OL appears while stall prevention is being activated.
Check point
Check the motor for use under overload.
Corrective action
Reduce the load weight.
Operation Panel Indication
OPT FR-PU04 Option Fault
Name
Communication error
Description
Stops the inverter output if a setting error or connection
(connector) fault occurs during use of RS-485 communication
function.
Check point
Check that the connector is plugged securely.
Corrective action
Make connection securely.
Please contact your sales representative.