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List of fault displays
8
Warning
Safety stop
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.
24V external power
supply operation
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.
Alarm
Fan alarm
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.
Fault
Overcurrent trip during
acceleration
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 trip during
constant speed
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 trip during
deceleration or stop
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.
Regenerative
overvoltage trip during
acceleration
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.
Regenerative
overvoltage trip during
constant speed
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 c
orrect
ly.
Regenerative
overvoltage trip during
deceleration or stop
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.
Function Name Description Corrective action Display