Toshiba TOSVERT VF-AS1 Instruction Manual page 307

(Continued)
Error
code



 Sequence error
 Encoder error




 V/f control error •An internal control error occurs.
 CPU1 fault

 Option 1 error
 Option 2 error

 CPU2 fault

13

Note: Please contact us if you find any trips other than the above.
Description Possible causes
Some items indicated on the motor
nameplate are not entered correctly.
•Base frequency 
Motor constant
•Base frequency voltage 1 
setting error
•Motor rated capacity 
•Motor rated current 
•Motor rated speed 
•Is circuit board (or main
Inverter type
circuit/drive circuit board)
error
replaced?
Analog input •Overrated voltage is applied to
terminal analog input.
overvoltage
•The signal from system is not
inputted into input terminals.
•The input terminal function (,
) is not set up.
•A value other than 0.0 is specified
for , although the brake
answer function is not used.
•Disconnection of encoder circuit.
•The encoder is not connected
correctly.
Speed error •Encoder error (inverter error)
(Over speed)
Key failure •The same key is input continuously
alarm more than 20 seconds.
•Braking down of a wire for VI/II
input signal.
Terminal input
•Terminal circuit board comes off
error
and falls
•P24 overcurrent
Abnormal •An error arises during CPU2
CPU2 communication.
communication
•A software error occurs in the
control CPU.
Abnormal logic •An abnormal voltage is applied to
input voltage the control logic input terminal.
•Expansion I/O card 1 is defective.
•Expansion I/O card 2 is defective.
•A deviation error occurs during stop
position retaining control.
Stop position •The stop position adjustment range
retaining error specified with  is too
narrow.
•Creeping speed is too fast.
•Motor control CPU is defective.
•The drive circuit board in the
inverter was damaged.
•The control voltage between +SU
Control power and CC terminals is too low.
backup •Control power is not supplied
undervoltage through +SU and CC terminals.
error •The parameter  is not set
correctly.
Step-out (for •The motor shaft is locked.
PM motors •One output phase is open.
only) •An impact load is applied.
•Make sure that all items on the motor nameplate
are entered correctly.
•When board has been replaced, input  for .
•Apply voltage within the rated voltage.
•Please check if the sequence is normal or not.
•Please set  or  as the input terminal to
use.
•Please set up 0.0, when you do not use system-
supporting sequence.
•Check connection of encoder.
Connect encoder correctly.
•Check whether the setting of  matches the
phase-A and phase-B connections of the encoder.
•Check connection of encoder.
Connect encoder correctly.
•Check the operation panel.
•Check VI/II input signal.
•Install the control terminal board to the inverter.
•Check P24 terminal short circuit to CC or CCA.
•Make a service call.
•Make a service call.
•Make a service call.
•Check the signal given to the logic connected with
the input terminal.
•Make a service call.
•Make a service call.
•Check connection of encoder.
•Adjust the proportional P gain .
•Increase .
•Lower the creeping speed.
•Make a service call.
•Check whether the voltage between +SU and CC
terminals is DC20V or more.
•Set  to 0 if a control power backup device
is not connected to +SU and CC terminals.
To reset the inverter that has been tripped because
of this error, turn it off and then back on.
•Unlock the motor shaft.
•Check the interconnect cables between the
inverter and the motor.
M-4
E6581445
Remedies