Справочник Пользователя для Mitsubishi Electronics FR-E720-0.1KSC to 15KSC

Safety stop function is activated (during output 
shutoff).



When not using the safety stop function, short across 
terminals S1 and PC and across S2 and PC with shorting wire 
for the inverter to run.



If 

 is indicated when across S1 and PC and across S2 

and PC are both shorted while using the safety stop function 
(drive enabled), internal failure might be the cause. Check the 
wiring of terminals S1, S2 and PC and contact your sales 
representative if the wiring has no fault.

The main circuit power supply is not supplied and 
the 24V external power is supplied while FR-E7DS 
is mounted. (The display flickers.)



Turn ON the power supply for the inverter (main circuit).



If 

 appears by turning ON the power supply of the inverter 

(main circuit) while the external 24V power is supplied, check 
the power supply (for the main circuit).



Check if the jumper is installed securely between terminal P/+ 
and P1.

The cooling fan is at a standstill although it is 
required to be operated. The cooling fan speed 
has decelerated. 

Check for fan failure. Please contact your sales representative.

Overcurrent has occurred during acceleration.



Set the acceleration time longer. (Shorten the downward 
acceleration time in vertical lift application.)



If "E.OC1" always appears at start, disconnect the motor once 
and restart the inverter. If "E.OC1" still appears, the inverter 
may be faulty. Contact your sales representative.



Check the wiring for output short circuit and ground fault.



When the rated motor frequency is 50Hz, set the Pr. 3 Base 
frequency to 50Hz.



Lower the stall prevention operation level.



Activate the stall prevention operation and the fast-response 
current limit operation. (Pr.156)



For the operation with frequent regenerative driving, set the 
base voltage (rated motor voltage, etc.) in Pr. 19 Base frequency 
voltage.



If the motor is coasting, stop the motor, then input a start 
command. Alternatively, use the automatic restart after 
instantaneous power failure/flying start function.

Overcurrent has occurred during constant speed 
operation.



Keep the load stable.



Check the wiring to avoid output short circuit or ground fault.



Lower the stall prevention operation level.



Activate the stall prevention operation and the fast-response 
current limit operation. (Pr.156)



If the motor is coasting, stop the motor, then input a start 
command. Alternatively, use the automatic restart after 
instantaneous power failure/flying start function.

Overcurrent has occurred during deceleration or 
at a stop.



Set the deceleration time longer.



Check the wiring to avoid output short circuit or ground fault.



Check if the mechanical brake is set to be activated too early.



Lower the stall prevention operation level.



Activate the stall prevention operation and the fast-response 
current limit operation. (Pr.156) 



If the motor is coasting, stop the motor, then input a start 
command. Alternatively, use the automatic restart after 
instantaneous power failure/flying start function.

Overvoltage has occurred during acceleration.



Set the acceleration time shorter.



Use the regeneration avoidance function (Pr. 882, Pr. 883, 
Pr.885, Pr.886)



Set the Pr. 22 Stall prevention operation level correctly.

Overvoltage has occurred during constant speed 
operation.



Keep the load stable.



Use the regeneration avoidance function (Pr. 882, Pr. 883, 
Pr.885, Pr.886).



Use the brake resistor, brake unit or power regeneration 
common converter (FR-CV) as required.



Set the Pr. 22 Stall prevention operation level correctly.

Overvoltage has occurred during deceleration or 
at a stop.



Set the deceleration time longer. (Set the deceleration time 
which matches the moment of inertia of the load.)



Make the brake cycle longer.



Use the regeneration avoidance function (Pr. 882, Pr. 883, 
Pr.885, Pr.886)



Use the brake resistor, brake unit or power regeneration 
common converter (FR-CV) as required.