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Toshiba Tosvert VF-AS1 Instruction Manual Page 325

The new high-performance inverter.
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(Continued)
Error
Problem
code
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
 is being performed.
because of
continuous

operation at the
lower-limit
frequency
Momentary
•The deceleration stop function of
 (regenerative power
power failure
slowdown stop
ride-through control) is activated.

prohibition
function
activated.
•First and last data in the 
Display of
/
first/last data
group.

items
•Learning for brake sequence

During learning
operation or light-load high-speed
operation is currently in progress.
•Braking operation is not performed
normally.
Brake sequence

•The load is too heavy.
learning error
•There are some operation errors.
Light-load
•There are some errors in the
high-speed
operation for learning for light-load

learning
high-speed operation.
operation error
•Learning operation for light-load
Light-load
high-speed operation is performed
high-speed
while the load is lifted.

•Motor constants (, ,
learning
 to ) are not
overload error
entered correctly.
•This message appears if the
Key operation
ENTER key is pressed and held

permitted
down for 5 seconds or more when
temporarily
key operation is prohibited by
.
Note: In the case of DC injection breaking ON/OFF function is selected for an input terminal; if "" disappears as a
result of open-circuit between the terminal and CC, it is normal.
[Pre-alarm display]
Error
Description
code

Overcurrent pre-alarm

Overvoltage pre-alarm
Achieving PBR operation
level

Overload pre-alarm

Overheat pre-alarm

Communication error
If two or more problems arise simultaneously, one of the following alarms appears and blinks.
, , , , ......, 
The blinking alarms , , , , are displayed in this order from left to right.
Possible causes
•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 .
•Brake signal output (, ) is not assigned to
the control output terminal.
•The brake function mode selection parameter
() is not set.
• Learning is performed while the load is lifted
•Check whether the learning operation for light-load
high-speed operation is performed correctly.
 Refer to 6.16.
•Check the load.
•Check the motor constant setting.
•When this message is displayed, all the keys are
operational. To prohibit key operation again, turn
off the inverter and then turn it back on.
Possible causes
Same as  (Overcurrent)
Same as  (Overvoltage)
 blink while PBR is operating is not
an error.
Same as  and  (Overload)
Same as  (Overheat)
•Various transmission errors occur
when computer is linked up with
inverter system.
•Various transmission errors occur in
inverter to inverter communication
(slave side). Time-out or trip in master
side.
M-7
E6581442
Remedies
Remedies
Same as  (Overcurrent)
Same as  (Overvoltage)
 blink while PBR is operating is not
an error.
Same as  and  (Overload)
Same as  (Overheat)
•For measures to correct various kinds
of data transmission errors, refer to
the instruction manual for the
communications device used
specified in Section 6.42.
•Check the master inverter.
13

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