Controlling Initial Start of Car Motion
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4
iControl DC
Controlling Initial Start of Car Motion
Some gearless machines may exhibit rollback at the start of car motion. . Rollback control
adjustments include:
• Pre-torque implementation for systems with analog load weighers
• Adjusting motor control parameters specific to start of motion
• Performing a thorough brake adjustment (iField Brake Module only)
Pre-torque Adjustments
When using an analog load weigher, load information may be used to provide hoist motor pre-
torque 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 section of this manual. See “Calibration” on page 5-56.
• 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. See “Adjust the Amplifier” on page 5-66.
Next, verify that the iBox is receiving the load weigher signals properly.
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