Pre-Torque Gain; Pre-Torque Offset; Pre-Torque Direction - KEB COMBIVERT F5 Instruction Manual

Pre-torque gain
Pre-torque offset
Pre-torque direction
Parameter Description
A car weighing system can be used to provide an analog signal
to the elevator drive which is proportional to the load in the cabin.
When LF.30 is set to 3, this analog signal is used to generate an
exact counter torque to hold the car stationary when the brake is
released. This is important for gearless speed control applications.
- 10 V → the car is empty
0 V → car weight + half load
= counterweight
10 V → the car is full
If the rated torque is too small or too large , it can be increased or
decreased with LF.67.
Unit: -
Value range: 0.25 ... 2.00
Default setting: 1
Adjusted value: depends on the required torque
If the counter weight is not 50 % (cabin weight + 50% of max. load),
the pre-torque can be adjusted with LF.68.
Unit:
Value range:
Default setting:
Adjusted value:
This parameter can be used to invert the direction of the pretorque
being applied to the motor.
Unit: 1
Value range: 0
1
Default setting: 0
Adjusted value: depends on the required torque direction
→ negative rated torque
→
0
→ positive rated torque
%
– 100.0 % ... 100.0 %
0 %
depends on the counter weight
=> +10V = positive torque
=> -10v = positive torque
10