4-29
Adjusting Leveling and Final Stop
iControl AC
4
Ride Quality
If you are experiencing a ride sensation that is not exactly an oscillation, but might be described
as a rough texture:
•
• For a TORQMAX F5 Drive, consider the following:
• LC03 Kp Speed Accel
• LC04 Kp Speed Decel
•LC08 Ki Speed Accel
•LC09 Ki Speed Decel
•LC25 Kp Speed High
• LC41 System Inertia
• LC42 FFTC Filter
•LC43 FFTC Gain
•LC44 Torque Cmd Filter
• For a Magnetek drive, consider the following:
• A1 - Response
• A1 - Gain Reduce Mult
•A1 - Gain Chng Level
•C1 - Hi/Lo Gain Src
•A1 - Inertia
• D1 - Est Inertia
• The speed control loop gains may not be adjusted properly. Please refer to the Magnetek
Elevator Drive Technical Manual.
• Motor shaft encoder may not be mounted securely, causing bouncing or slight variation in
speed feedback once every revolution. On a geared machine, the coupling used between
the tach or encoder and the motor can also be a source of vibration. In both cases, the
problem is visible by looking at the AC-coupled encoder speed signal on iBox test point
STP2 (with the Virtual Oscilloscope Test point 2 set to Speed Feedback). You may see the
vibration frequency increase and decrease with car speed. This is absolute proof of a
mechanical problem with the speed transducer. Electrically induced oscillations will be
characterized by a frequency that is constant (does not change significantly with speed).
• If the above steps do not resolve the vibration, the motor may not have been trimmed to
the machine properly. Use a dial indicator to check alignment of motor and machine.
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