Mitsubishi Electric FR-V500 Series Instruction Manual page 80

Control Panel
Indication
Name Output side earth (ground) fault overcurrent
This function stops the inverter output if an earth (ground) fault overcurrent flows due to an earth
Description
(ground) fault that occurred in the inverter's output (load) side.
Check point
Check for an earth (ground) fault in the motor and connection cable.
Corrective action Remedy the earth (ground) fault portion.
Control Panel
Indication
Name External thermal relay operation
If the external thermal relay provided for motor overheat protection, or the internally mounted
Description
temperature relay in the motor, etc. 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.
Corrective action Reduce the load and operating duty.
Control Panel
Indication
Name
Motor overload
For V/F control, the stall prevention function is activated if the current flow in the motor exceeds
150% (factory setting) of the inverter rated current, an alarm stop is made if the status that the
output frequency is lowered at 0Hz persists for 3s.
Description For speed/position control, if the torque limit is activated under high load, the motor stalls to the
speed less than the low speed detection (Pr. 865) value, and an alarm stop is made if the status
that the output torque is more than the OLT level setting (Pr. 874) value persists for 3s.
This function is not activated for torque control.
• Check the motor for use under overload.
Check point
• Check that the low speed detection (Pr. 865) and OLT level setting (Pr. 874) values are correct.
• Reduce the load weight.
Corrective action
• Change the stall prevention operation level (Pr. 22), low speed detection (Pr. 865) and OLT level setting
Control Panel
Indication
Name Option alarm
Stops the inverter output when two or more communication options are mounted. (*5)
When the high power factor converter (FR-HC) or power regeneration common converter (FR-CV)
Description
is connected, this alarm appears if an AC power supply is connected to the R, S, T terminals
accidentally.
• Check that the number of communication options mounted is one.
• When the high power factor converter (FR-HC) or power regeneration common converter (FR-
Check point
• When the parameter set is for the option use, the option is not fitted nor connected securely.
• Mount only one communication option.
• Check the Pr. 30 setting and wiring.
• Check the Pr. 419 and Pr. 804 settings.
Corrective action
• When the high power factor converter (FR-HC) or power regeneration common converter (FR-
*5:The FR-A5NR (relay output/computer
link) allows one more communication option to be fitted. In this case, only relay output is usable and
exercised.)
computer link is unusable.
E.GF
E.OHT
E.OLT
(Check the stall prevention operation level (Pr. 22) setting if V/F control is exercised.)
(Pr. 874) values. (Check the stall prevention operation level (Pr. 22) setting if V/F control is exercised.)
E.OPT
CV) is connected, check that an AC power supply is not connected to the R, S, T terminals.
CV) is connected, connecting an AC power supply to the R, S, T terminals may damage the
inverter. Please contact your sales representative.
(Check the stall prevention operation level (Pr. 22) setting if V/F control is
FR-PU04V Ground Fault
FR-PU04V OH Fault
Stll Prev STP (OL shown during stall
FR-PU04V
prevention operation)
FR-PU04V Option Fault
77
Errors (Alarms)
6