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

External Load Weigher

Pre-torque gain

External Load Weigher
Pre-torque offset
External Load Weigher
Pre-torque direction
120
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:
Default setting:
Adjusted value:
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:
Default setting:
Adjusted value:
Note: Parameters LF.67-69 refer to pre-torque using an external
i
pre-torque device (load weigher), not the drive synthetic pre-
torque function. When using a load wither, LF.30 can be set to 3
to activate pre-torque.
Parameter Description
-
0.25 ... 2.00
1
depends on the required torque
%
– 100.0 % ... 100.0 %
0 %
depends on the counter weight
0 => +10V = positive torque
1 => -10v = positive torque
1
depends on the required torque direction
negative rated torque

0
 positive rated torque