Trip Causes/Warnings And Remedies - Toshiba TOSVERT VF-AS1 Instruction Manual

13. Before making a service call
13.1

Trip causes/warnings and remedies

When a problem arises, diagnose it in accordance with the following table.
If it is found that replacement of parts is required or the problem cannot be solved by any remedy described in the table,
contact your supplier.
[Trip information]
Error
Description
code
Overcurrent

during

acceleration
Overcurrent

during

deceleration
Overcurrent

during fixed

speed
[Note] , ,
 originate from
causes other than those
mentioned above.
Overcurrent
(loaded side

overcurrent at
start time)
U-phase arm

short-circuit
V-phase arm

short-circuit
W-phase arm

short-circuit
Input phase

failure
* Output phase
failure

Overvoltage
during

acceleration
Overvoltage
during

deceleration
*Presence or absence of parameter trip can be selected.
(Continued overleaf)
Possible causes
•The acceleration time  is too short.
•The V/f setting is improper.
•A restart signal is input to the
rotating motor after a momentary
stop, etc.
•A special motor (e.g. motor with a
small impedance) is used.
•Manual torque boost value () is large.
•The deceleration time  is too
short. (in deceleration)
•The load fluctuates abruptly.
•The load is in an abnormal
condition.
•A main circuit elements is defective.
•Overheat protection is activated.
•The insulation of the output main
circuit or motor is defective.
•The motor has too small
impedance.
•A main circuit elements is defective
(U-phase).
•A main circuit elements is defective
(V-phase).
•A main circuit elements is defective
(W-phase).
•A phase failure occurred in the
input line of the main circuit.
•A phase failure occurred in the
output line of the main circuit.
•The input voltage fluctuates abnormally.
(1)The power supply has a capacity
of 500kVA or more.
(2)A power factor improvement
capacitor is opened and closed.
(3)A system using a thyrister is
connected to the same power
distribution line.
•A restart signal is input to the
rotating motor after a momentary
stop, etc.
•The deceleration time  is too
short (regenerative energy is too
large).
•The dynamic braking resistor has a
considerably large resistance.
• (Dynamic braking resistor) is OFF.
Overvoltage limit operation 
is OFF.
•The input voltage fluctuates abnormally.
(1)The power supply has a capacity
of 500kVA or more.
(2)A power factor improvement
capacitor is opened and closed.
(3)A system using a thyrister is
connected to the same power
distribution line.
M-1
- Trip information and remedies
Remedies
•Increase the acceleration time .
•Check the V/f parameter setting.
•Use (Auto-restart) and  (Regenerative
power ride-though control).
•Increase the carrier frequency .
•Decrease  setting value.
•Increase the deceleration time .
•Reduce the load fluctuation.
•Check the load (operated machine).
•Make a service call.
•Check operation of cooling fan.
•Check cooling fan control mode parameter
.
•Check the cables and wires for defective
insulation.
•Selection of short circuit detection at starting
parameter .
•Make a service call.
•Make a service call.
•Make a service call.
•Check the main circuit input line for phase failure.
•Check the main circuit output line, motor, etc. for
phase failure.
•Select output phase failure detection parameter
.
•Insert a suitable input reactor.
•Use  (Auto-restart) and  (Regenerative
power ride-though control).
•Increase the deceleration time .
•Install a dynamic braking resistor.
•Decrease dynamic braking resistance. (Also reset
the .)
•Set dynamic braking mode parameter 
properly.
•Set overvoltage limit operation  properly.
•Insert a suitable input reactor.
E6581301
13