Brake Set Speed; Pre-Torque Gain; Pre-Torque Offset - KEB COMBIVERT F5 Instruction Manual

Brake Set Speed

Pre-torque Gain

Pre-torque Offset

Parameter Description
In open loop it is not possible to produce holding torque at zero speed.
Therefore, it is necessary to drop the brake just before the motor
reached zero speed. This is parameter is only used when operating
in open loop mode LF.4 = 0, and will cause the DRO output
X2A.27...29 to drop when the motor goes below the adjusted speed.
This parameter is only visible in open loop mode (LF.4 = IOPEn).
Unit: feet per second
Value range: 0.0...2.0 ft/min
Factory setting: 1.0 ft/min
Adjustment value: 1.0 ft/min
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 cabin is empty
0 V → cabin weight + half load
= counterweight
10 V → the cabin 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
Factory 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:
Factory setting:
Adjusted value:
→ negative rated torque
→ 0
→ positive rated torque
%
– 100.0 % ... 100.0 %
0 %
depends on the counter weight
US
79