Toshiba TOSVERT VF-AS1 Instruction Manual page 308

[Alarm] The following are messages only. No trip is developed.
Error
Problem
code
ST signal OFF •ST terminal is in open-circuit.

•The control voltage between +SU
and CC terminals is too low.
•Control power is not supplied
Control power through +SU and CC terminals.
 backup •The parameter  is not set
undervoltage correctly.
•The supply voltage between R, S
Undervoltage in and T is under voltage.

main circuit •Trouble of rush current restraint
circuit or DC circuit fuse.
•The inverter is in the process of
retry.
 Retry
•A momentary stop occurred.
•The frequency setting signals at
Point setting
points 1 and 2 are set too close to

alarm
each other.
•This message is displayed when
pressing the STOP key while an
Clear enabling
 error code is displayed.
indication
• Input terminal RES signal is ON
during trip display.
Emergency stop •The operation panel is used to stop
enabling the operation in automatic control

indication or remote control mode.
Setting error •An error is found in a setting when
alarm data is reading or writing.
An error code
/ and data are
displayed
alternately twice
each.
•DC braking in process
DC braking

Shaft fixing in •Motor shaft fixing control is in

control process.
•The digit number of the item
displayed, e.g., frequency, is in

Panel indication excess of the specified digit

overflow number.

(Number of overflowing digits is
indicated.)
Parameters in •Parameters are being initialized to
 the process of default values.
initialization
•Auto-tuning 1 in process.
In auto-tuning 1

Auto-stop •The automatic stop function of
because of  is being performed.
continuous

operation at the
lower-limit
frequency
Momentary •The deceleration stop function of
power failure  (regenerative power ride-
slowdown stop through control) is activated.

prohibition
function
activated.
Display of •First and last data in the 
/
first/last data group.

items
•Learning for brake sequence
During learning operation or light-load high-speed

operation is currently in progress.
(Continued overleaf)
Possible causes
•Close ST-CC circuit.
•Check whether the voltage between +SU and CC
terminals is DC20V or more.
•Set  to  if a control power backup device
is not connected to +SU and CC terminals.
In the event of a  error, the inverter will not
be reset automatically even if the control voltage
between +SU and CC terminals returns to its
normal level. To reset the inverter, turn it off and
then back it on.
•Measure the main circuit supply voltage.
If the voltage is at a normal level, the inverter
requires repairing.
•Make a service call.
•The inverter is normal if it restarts after several
tens of seconds. The inverter restarts
automatically. Be careful of the machine because it
may suddenly restart.
•Set the frequency setting signals at points 1 and 2
apart from each other.
•Press the STOP key again to clear the trip.
•Turn off the input terminal RES signal.
•Press the STOP key for an emergency stop. To
cancel the emergency stop, press any other key.
•Check whether the setting is made correctly.
•The message goes off in several tens of seconds if
no problem occurs. [Note]
•If the message disappears by stop command (ST-
CC open), it is normal.
•For indication of frequency, set multiplying rate
() lower. (Parameter setting that results in
overflow is of course valid.)
•Normal if the message disappears after a while
(several seconds to several tens of seconds).
•Normal if it the message disappears after a few
seconds.
•This function is deactivated when the command
frequency becomes 0.2Hz or more higher than the
lower-limit frequency (LL) or when a command for
stopping operation is entered.
•To restart operation, reset the inverter or input an
operation signal again.
•To exit from the group, press the MODE key.
•To cancel learning, suspend it and set learning
parameters  to .
M-5
E6581445
Remedies
13