Toshiba TOSVERT VF-AS1 Instruction Manual page 165

(1) = (In sync with acceleration/deceleration)
The increase in operation frequency is inhibited by the activation of the torque limit function. In this control mode,
therefore, the actual speed is always kept in sync with the operation frequency. The operation frequency restarts
to increase when torque decreases as a result of the release of the mechanical brake, so the time required for the
specified speed to be reached is the sum of the delay in operation of the mechanical brake and the acceleration
time.
6
(2) =(In sync with min. time)
The operation frequency keeps increasing, even if the torque limit function is activated.
In this control mode, the actual speed is kept in sync with the operation frequency, while torque is held at a limit
level when it decreases as a result of the release of the mechanical brake. The use of this function prevents the
load from failing and improves the motor's response during inching operation.
Frequency [Hz]
If the torque limit function
is not activated
Torque [N·m]
Torque limit level
ON
Mechanical brake
Frequency [Hz]
Operation frequency
Torque [N·m]
Torque limit level
ON
Mechanical brake
Operation frequency
OFF
(released)
Actual speed
(Acceleration rates vary depending
on the torque limit level.)
Torque is held at a limit level even
after the mechanical brake is released.
OFF
(released)
F-44
E6581528
Actual speed
Time [s]
Time [s]
Time [s]
Time [s]
Time [s]
Time [s]