4-16 Manual # 42-02-2223
Final Adjustment
Controlling Initial Start of Car Motion
Some gearless machines may exhibit rollback at the start of car motion. Geared machines
rarely exhibit rollback. To control rollback at the start of car motion:
• Pre-torque implementation for systems with analog load weighers
• Adjust drive control parameters specifically designed for the start of motion
• Perform a sophisticated brake adjustment (iField Brake Module only)
Pre-torque Adjustments
For installations using an analog load weigher, load information can be used to provide “pre-
torquing” of the hoist motor as necessary to accommodate load changes at a floor and prevent
sagging or rollback.
Performing safety and buffer tests described later in this section will probably require that you repeat the
pre-torque adjustment described here.
Pre-torque adjustment includes:
• Load weigher sensor adjustment
• Balanced load determination
•Pre-torque gain control adjustments
Load Weigher Sensor Adjustment
Review the installation and adjustment instructions for the load weigher and verify that all
steps have been completed, including:
• Rope Tension Sensing Load Weigher - perform the procedures described in the EMCO
Load Weigher instruction.
• Crosshead Deflection Load Weigher - perform the procedures described in the “Adjust-
ments” section of the K-Weigh Instruction Manual.
• Isolated Platform Load Weigher - perform the adjustment procedures described in the
MCE Load Weigher instruction.
Next, verify that the iBox is receiving the load weigher signals properly.
1. On Independent service, move the car to the landing where the test weights are stored.
2. On the iView Virtual Oscilloscope screen, select Load Weigher (Raw) on Test point 1.
3. With the car empty, verify Test point 1 reading is at least 0.5 but not greater than 1.5.
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