Parameters; Cause Of Trip, Warning Indication (In Detail And Countermeasures) - Toshiba TOSVERT VF-A7 Instruction Manual

12. Prior to service call

12. 1 Cause of trip, warning indication (in detail and countermeasures)

If there is something abnormal in the inverter or system, troubleshoot referring to the following table
before calling service. If the inverter needs to replace some part or the cause of the trouble cannot be
removed by the measures mentioned in the table, consult the dealer of the inverter about the trouble.
[Trip information]
Indication
Overcurrent
during

 acceleration
(DC current)
Overcurrent
during

 deceleration
(DC current)
Overcurrent
during

fixed speed

(DC current)
Note: ,,
 originate
from causes other
than those
mentioned above.
Overcurrent
(loaded side

over-current at
start time)




(*1)



(*1): Presence or absence of parameter trip can be selected.
(Continued on the following page)
Contents Expected causes
Acceleration time #1  is too short.
V/f parameter is improperly set.
Running motor is started during
momentary power failure.
Special motor (low impedance) is
used, isn't it?
Manual torque boost value() is large.
Deceleration time #1  is too
short (in deceleration).
Load rapidly varied.
Load is abnormal.
A device of main circuit is faulty.
Overheat protection is activated.
(5.5 to 15 kW, 30 kW)
Control voltage drop prevention function is
activated. (5.5 to 15 kW, 30 kW types)
Failure in wiring of main output
circuit or motor insulation.
Motor impedance is too low.
U-phase arm Something abnormal in some
short-circuit device of main circuit (U-phase).
V-phase arm Something abnormal in some
short-circuit device of main circuit (V-phase).
W-phase arm Something abnormal in some
short-circuit device of main circuit (W-phase).
Phase failure Phase lacking in input side of
(input side) main circuit.
Phase lacking in output side of
main circuit.
Phase failure
(output side)
Input voltage abnormally varied.
1: Power-factor improving capacitor was
turned on/off.
Overvoltage
2: Some unit using thyrister is connected
during
with the same power supply line.
acceleration
Running motor is started during
momentary power failure status.
Deceleration time #1  is too short
(too much regenerated energy).
PBR resistance is too high.
Dynamic braking mode  is disabled.
Over-voltage stall protection  is
Overvoltage
disabled.
during
Input voltage abnormally varied.
deceleration
1 Power capacity is 500 kVA or more.
2 Power-factor improving capacitor was
turned on/off.
3 Some unit using thyrister is connected
with the same power supply line.
Trip information and countermeasures
Extend acceleration time #1 .
Check V/f parameter.
Use  (Auto-restart) or 
(Regenerative power ride-through control).
Raise carrier frequency .
Decrease setting value.
Extend deceleration time #1 .
Reduce load variation.
Check loading unit.
Make a service call.
Check operation of cooling fan.
Check cooling fan control mode
parameter .
Check the wiring and motor
insulation.
Properly set output short-circuit detection
parameter  and .
Make a service call.
Make a service call.
Make a service call.
Check connection of main input
circuit for phase lacking in input side.
Check connection of main output circuit
and motor for phase lacking in output
side.
Select output phase failure detection
parameter  for checking.
Try to insert input reactor.
Use  (Auto-restart) and
 (Regenerative power ride-
through control).
Extend deceleration time #1 .
Install dynamic braking resistor.
Decrease dynamic braking resistance.
(Also reset the .)
Set dynamic braking mode parameter
 properly.
Set over-voltage stall protection 
properly.
Try to insert input reactor.
L-1
Countermeasures