Car And Counterweight Balance - Motion Control Engineering Motion 4000 Manual

Final Adjustments

Car and Counterweight Balance

Hoistway machine performance is specified to a particular load (car equipment and passengers)
and to a specified offset to the load through counterweighting. On modernizations, the weight
of the car is often changed but compensating adjustments to the counterweight are sometimes
overlooked. This adjustment is important to performance and ride characteristics.
1. Place a balanced load in the car (specified percentage of full load; typically 40% but
sometimes 45 or 50%).
2. On Machine Room Inspection, run the car to the middle of the hoistway to the position
learned by performing the counterweight learn procedure.
3. Turn controller power OFF.
4. Manually lift the brake.
5. Watch the car to see if it drifts. If not, the car and counterweight are balanced.
• If the car drifts up, remove weight from the counterweight or add weight to the car and
repeat the balancing procedure.
• If the car drifts down, add weight to the counterweight or remove weight from the car
and repeat the balancing procedure.
• For a drum machine, follow the manufacturer counterweighting recommendations
and test the drum machine limit switches.
6. When car and counterweight are balanced, record the actual weight in the car for future
reference. Balanced load = _____________lbs.
7. Restore controller power.
3-8 Manual # 42-02-2P24