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Toshiba Tosvert VF-AS1 Instruction Manual Page 146

The new high-performance inverter.
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 Starting procedure
At the run command, the inverter makes the motor produce the torque specified with parameter . As soon
as a torque output command is issued, a brake release request signal is put out through the brake output terminal.
Upon expiration of the brake release time set with , the motor starts to accelerate.
 Stopping procedure
At the stop command, the operation frequency is decreased to the creep frequency set with parameter ,
and put out the braking request after the creep time 1 set with . And then, the creep frequency is
maintained for the creep time set with . While the creep frequency is maintained, the brake release signal is
put out through the braking signal output terminal to apply the brake.
Output frequency
Starting frequency
Torque 
Braking signal
Braking operation
RUN command
Ex.) When using the OUT1 terminal as the brake signal output terminal
 Learning function []
Using this function, rough settings can be made automatically and also parameters , and 
can be set automatically.
After the learning function is set,  will be set automatically to  and  to . If necessary, fine
adjust the parameter setting manually.
[Learning operation]
Set parameter  to  and enter an operation command to start learning. (The frequency and "" are
displayed alternately.)
Parameter  (torque) is set, the brake release timing is calculated, and parameter  (release time) is
set based on the calculation result.  is set automatically according to the motor constant calculated. At the
stop of operation,  (creep time) are set.
Note1: Learning should be performed under light-load conditions.
Note2: For the braking functions, the pre-excitation time is automatically determined by the inverter from
motor-related constants.
When the VFAS1-2037PL is used in combination with a Toshiba 4P-3.7kW-60Hz-200V standard motor, the
preliminary excitation time is approximately 0.1 to 0.2 seconds.
Depending on the motor used, the preliminary excitation time may be prolonged.
Note3: When using braking functions, set parameter  (automatic torque boost) to  (voltage vector control +
auto-tuning 1) or set motor-related parameters  to .
Note 4: If a counterweight is provided, a learning error may occur. If so, make an adjustment manually.
Note 5: Brake learning (=) should be carried out for normal rotation if  is set to  (forward
winding), or for reverse rotation if  is set to  (reverse winding).
Torque control
Speed control
Issue of torque command
Brake release request
Output terminal function selection 1 (OUT1)
Braking request
Adjustment range
Creepinjg frequency
Time [s]
Setting value


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