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Brake Torque Check Function
The brake torque check function checks the holding torque of the motor brake.
The drive receives the MFDI signal set for Brake Trq Req (H1-xx = 5D) and Up/Down command from the PLC.
When the Up/Down command is turned ON (closed) while the MFDI signal set for Brake Trq Req is ON (closed)
during zero-speed detection, the drive starts the brake torque check.
Do the brake torque check with 0% load and the brake closed. If the elevator moves during the check, the drive
judges that the brake has deteriorated, detects a brA [Brake Deterioration] fault, and then stops.
Note:
• You can use this function only when A1-02 = 3 or 7 [Control Method Selection = CLV or CLV/PM].
• The drive will not detect the PGo [Encoder (PG) Feedback Loss] fault, SE2 [Starting Current Error] fault, or SE4 [Brake Response
Error] fault during the brake torque check.
• The drive disables this function during Rescue Operation or Inspection Operation.
Operation Conditions to Use the Brake Torque Check Function
• Before you begin, set S5-32 [Applying Motor Torque During BTC] as the brake torque check reference value.
• Do not add weight to the elevator car.
• Use the Up command to operate the drive.
• Position the elevator car on a middle floor to decrease the effect of weight on the cable.
Setting Value of S5-32
Subtract the torque that is pulled by the counterweight in upward operation with 0% load from the required brake
torque. Use this difference as the value for S5-32.
• (Example) When required brake torque is 150% and the torque pulled by the counterweight is 100%:
150% - 100% = 50%
S5-32 = 50%
1. When you use a drive monitor to check the torque pulled by the counterweight to set S5-32:
Do Position Lock (upward operation) with the brake open and at 0% load, and check the value of U1-09
[Torque Reference].
2. When you calculate the brake torque to set S5-32:
Since the motor outputs the torque in the same direction as the load torque TL in upward operation with 0%
load, when the motor is stopped, brake torque Tb = load torque TL × η.
The brake torque to stop the motor (to stop the elevator) is:
Tb = motor torque Tm + TL × η
Therefore, S5-32 (%) = (Tb - TL × η) / motor rated torque Tm
Note:
• TL: Load torque (torque pulled by the counterweight) for upward operation with 0% load
• η: Machine efficiency
• Tb: Brake torque
• Tm: Motor torque
• Tm
: Motor rated torque
100
• (Example) When the elevator rated load is 600 kg, speed is 45 m/min, required brake torque is 31 N∙m, machine
efficiency is 0.6, rated motor speed is 1750 min
Required power P (kW) = 600 kg / 2 × 45 m/min / (6120 × η0.6) = 3.676 kW
Load torque TL (N∙m) = (60 × 3.676 kW) / (2π × 1750min
S5-32 = (31 N∙m - 20.06 N∙m × 0.6) / 20.19 N∙m × 100 = 147.4%
YASKAWA TOMPYEULA7002A LA700 Series Installation and Operation Instruction
× 100
100
-1
, and motor rated torque is 20.19 N∙m:
-1
) × 103 = 20.06 N∙m
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