Controlling Initial Start Of Car Motion; Pre-Torque Adjustments; Load Weigher Sensor Adjustment - MCi iControl User Manual

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.
Note
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 section of this manual.
• 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 section of this manual.
Next, verify that the iBox is receiving the load weigher signals properly.
1. Place the car on Independent service and move the car to the landing at which the test
weights are stored.
2. Open the iView Virtual Oscilloscope screen and select Load Weigher (Raw) on Test
point 1.
3. With the car empty, verify that the Test point 1 reading is at least 0.5 but not greater
than 1.5.
4-16 Manual # 42-02-2222
See "Calibration" on page
See "Adjust the Amplifier" on page 5-68
5-57.