Prepare for Final Adjustments
3-29
3
iControl DC
Counterweight Balancing
On modernizations, the weight of the car is often changed but compensating adjustments to the
counterweight are sometimes overlooked. This adjustment is important for achieving desired
performance and ride characteristics. The following are two ways in which the car / counter-
weight balance can be verified:
Option 1 (preferred method)
1. Place a balanced load in the car (specified percentage of full load; typically 40%).
2. On Inspection, run the car to the middle of the hoistway to the position learned by per-
forming the Counterweight Learn Procedure (See “Counterweight Learn Procedure” on
page 28.). Verify the position using the Actual Position displayed on the Operational
Status tab.
3. Turn controller power OFF.
4. Use a portable supply to inject sufficient DC voltage at controller terminals B1 and B2 to
lift the brake. (Or, 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.
Option 2
1. Place a balanced load in the car (specified percentage of full load; typically 40%).
2. On Inspection, run the car to the middle of the hoistway to the position learned by per-
forming the Counterweight Learn Procedure (See “Counterweight Learn Procedure” on
page 28.). Verify the position using the Actual Position displayed on the Operational
Status tab.
3. On the iView Virtual Oscilloscope, set Test point 1 to Armature Current signal. You can
view the value displayed on the Virtual Oscilloscope, or connect a multi-meter to test
points STP1 and GND on the right side of the iBox.
4. Starting from the middle of the hoistway each time, run the car up and then down and
note the current amplitude. If the currents are equal, the counterweight is close to the
correct value.
• If more current is required to run the car up, add weight to the counterweight or
remove weight from the car and repeat the balancing procedure.
• If more current is required to run the car down, remove weight from the counterweight
or add weight to the car and repeat the balancing procedure.
• For a drum machine, follow the manufacturer counterweighting recommendations
and test the drum machine limit switches.
5. When the car and counterweight are balanced, record the actual weight in the car for
future reference. Balanced load = _____________lbs.
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