Toshiba Q9 Plus ASD, Installation & Operation Manual

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E6581611
F-92
6
Power running torque limit and regenerative braking torque limit can be set with the parameters
f441
and
f443 .
[Parameter setting]
Title Function Adjustment range Default setting
f441 
Power running torque limit 1 level
0.0-249.9 (%),
250.0: Disabled
250.0
f443  Regenerative braking torque limit 1 level
0.0-249.9 (%),
250.0: Disabled
250.0
f454 
Constant output zone torque limit
selection 0: Constant output limit
1: Constant torque limit
0
Using parameters, two different torque limits can be set for each operating status: power running and
regenerative braking. Refer to Section 7.2.1 for the setting for switching from the terminal board.
Power running torque limit 1 :  Regenerative braking torque limit 1 : 
Power running torque limit 2 :

Regenerative braking torque limit 2 :

Note: If the value set with
f601
(stall prevention level) is smaller than the torque limit, then the value set with
f601 acts as the torque limit.
6.26.2 Torque limit mode selection at acceleration/deceleration
f451  : Acceleration/deceleration operation after torque limit
•
Function
Using this function in combination with the mechanical brake of the lifting gear (such as a crane or hoist)
makes it possible to minimize the delay before the brake starts working, and thus prevents the load from
falling due to torque decrease.
Moreover, it improves the motor’s response during inching operation and keeps the load from sliding down.
[Parameter setting]
Title Function Adjustment range Default setting
f451 
Acceleration/deceleration operation after
torque limit
0: In sync with acceleration /
deceleration
1: In sync with min. time
0
(1) f451 = 0 (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
reaching the specified speed is the sum of the delay in operation of the mechanical brake and the acceleration
time.