Car and Counterweight Balance
42-02-2M01 A1 3-7
3
Motion 4000
Adjusting Floor Heights
Stored floor heights may be accessed through the F7 menu (first 64 parameters) and the height
of each floor individually adjusted at any time. F7 parameter 67 allows you to adjust the coun-
terweight height.
1. Enter the F7 menu (F7 up, all other switches down).
2. Press N to advance to the desired parameter.
3. Use “+” or “-” buttons to adjust the height of the floor (or counterweight).
4. Press S and then N to store the parameters.
5. Place F7 in the down position.
Door Zone Verification
Following the hoistway learn process, starting at the top floor, move the car down on inspection
and verify that the door zone indicators (e.g., LEDs, relays, diagnostic status, etc.) activate only
at the appropriate locations at the landings (i.e., +/- 75 mm or 3”) and nowhere else. Be sure to
check rear door zones as well, where applicable.
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.
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