Mitsubishi Electric FR-F700 Series, Инструкция по эксплуатации

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Causes and corrective actions
*4 Functions only when any of Pr. 178 to Pr. 189 (input terminal function selection) is set to OH.
Operation Panel
Indication
E.OLT FR-PU04
Still Prev STP ( OL shown during stall
prevention operation)
Name Stall prevention
Description
If the frequency has fallen to 0.5Hz by stall prevention operation and remains for 3s, an alarm
(E.OLT) appears to shutoff the inverter output. OL appears while stall prevention is being activated.
Check point · Check the motor for use under overload. (Refer to the Instruction Manual (applied).)
Corrective action · Reduce the load weight.
Operation Panel
Indication
E.GF FR-PU04 Ground Fault
Name
Output side ground fault overcurrent protection
Description
This function stops the inverter output if a ground fault overcurrent flows due to an ground fault that
occurred on the inverter's output (load) side.
Check point Check for a ground fault in the motor and connection cable.
Corrective action Remedy the ground fault portion.
Operation Panel
Indication
E.LF FR-PU04

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.
Check point
· Check the wiring (Check that the motor is normal.)
· Check that the capacity of the motor used is not smaller than that of the inverter.
Corrective action
· Wire the cables properly.
· Check the
Pr. 251 Output phase failure protection selection setting.
Operation Panel
Indication
E.OHT FR-PU04 OH Fault
Name
External thermal relay operation
*4
Description
If the external thermal relay provided for motor overheat protection, or the internally mounted
temperature relay in the motor, etc. switches on (contacts open), the inverter output is stopped.
Check point
· Check for motor overheating.
· Check that the value of 7 (OH signal) is set correctly in any of
Pr. 178 to Pr. 189 (input terminal
function selection)
.
Corrective action
· Reduce the load and operating duty.
· Even if the relay contacts are reset automatically, the inverter will not restart unless it is reset.
Operation Panel
Indication
E.PTC FR-PU04 Fault 14
Name
PTC thermistor operation
Description
Appears when the motor overheat status is detected for 10s or more by the external PTC
thermistor input connected to the terminal AU.
Check point
· Check the connection between the PTC thermistor switch and thermal protector.
· Check the motor for operation under overload.
· Is valid setting (=63) selected in
Pr. 184 AU terminal function selection
?
(Refer to the Instruction
Manual (applied).)
Corrective action
Reduce the load weight.
Operation Panel
Indication
E.OPT FR-PU04 Option Fault
Name Option alarm
Description
Appears when the AC power supply is connected to the terminal R/L1, S/L2, T/L3 accidentally
when a high power factor converter is connected.
Check point
· Check that the AC power supply is not connected to the terminal R/L1, S/L2, T/L3 when a high power
factor converter (FR-HC, MT-HC) or power regenerative common converter (FR-CV) is connected.
Corrective action
· Check the parameter (
Pr. 30
) setting and wiring.
· The inverter may be damaged if the AC power supply is connected to the terminal R/L1, S/L2, T/
L3 when a high power factor converter is connected. Please contact your sales representative.