Program features 151
Brake slip check
This function checks for any brake slips while torque proving is performed with the
brake closed. If the actual elevator speed (05.04 LIFT SPEED ACT) exceeds the
defined speed limit (parameter 35.85 SLIP SPEED LIM) during torque proving and
stays there for longer than defined with parameter 35.86 SLIP FAULT DELAY, the
drive trips on fault BRAKE SLIP.
Settings
Diagnostics
Brake open torque selection
The Brake open torque selection function ensures the right starting torque level after
brake opening and, thus, prevents the speed from dropping. The function is in
operation when torque proving is completed and the brake open command is
triggered.
With parameter 35.80 BRK OPEN TRQ SEL, you can select the following sources for
the brake open torque:
• 02.05 AI1 SCALED or 02.07 AI2 SCALED: brake open torque source as an AI-
scaled value. Used when a load sensor is available.
• 35.07 BRAKE OPEN TORQ: brake open torque source as a fixed value. Used
with counter weightless lift.
The starting torque can be ramped up and down by using a user defined ramp time.
• Parameter 35.10 TORQ RAMP UP – ramp time to build up the starting torque
against the closed brake.
• Parameter 35.11 TORQ RAMP DOWN – time to ramp down the torque to zero,
after brake is closed.
Parameters Additional information
35.85 SLIP SPEED LIM Defines the speed limit to be checked during torque proving.
35.86 SLIP FAULT DELAY Defines the time delay for generating fault BRAKE SLIP.
Signals Additional information
Actual signals
05.02 LIFT FW bit 2
(BRAKE SLIP)
Displays whether fault BRAKE SLIP has occurred or not.
Faults
BRAKE SLIP The brake slipped while a torque proving sequence was taking place.
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