Toshiba VF-nC1 - Manual (Page 130)

E6581090
M-2
13
(Continued)
Error
code Alarm
code
Problem Possible causes Remedies
QR 000B Overvoltage during
deceleration • The deceleration time FGE is
too short. (Regenerative
energy is too large.)
• H (overvoltage limit
operation) is off.
• The input voltage fluctuates
abnormally.
① The power supply has a
capacity of 200kVA or more.
② A power factor improvement
capacitor is opened or closed.
③ A system using a thyristor is
connected to the same power
distribution line.
• Increase the deceleration time
FGE .
• Enable H (overvoltage
limit operation).
• Insert a suitable input reactor.
QR 000C Overvoltage during
constant-speed
operation • The input voltage fluctuates
abnormally.
① The power supply has a
capacity of 200kVA or more.
② A power factor improvement
capacitor is opened or closed.
③ A system using a thyristor is
connected to the same power
distribution line.
• The motor is in a regenerative
state because the load causes
the motor to run at a frequency
higher than the inverter output
frequency.
• Insert a suitable input reactor.
QN 000D Inverter overload • The acceleration time ACC is
too short.
• The DC braking amount is too
large.
• The V/F setting is improper.
• A restart signal is input to the
rotating motor after a
momentary stop, etc.
• The load is too large.
• Increase the acceleration time
CEE .
• Reduce the DC braking amount
H and the DC braking
time H.
• Check the V/F parameter
setting.
• Use H (auto-restart) and
H
(ride-through control).
• Use an inverter with a larger
rating.
QN 000E Motor overload • The V/F setting is improper.
• The motor is locked up.
• Low-speed operation is
performed continuously.
• An excessive load is applied to
the motor during operation.
• Check the V/F parameter
setting.
• Check the load (operated
machine).
• Adjust QNO to the overload
that the motor can withstand
during operation in a low speed
range.
*
GRJ 0009 Output phase failure • A phase failure occurred in the
output line of the main circuit.
• Check the main circuit output
line, motor, etc., for phase
failure.
• Enable H (Output phase
failure detection).
(Continued overleaf)