Installation
1-60 Manual # 42-02-2P26
Speed Changes Felt Excessively in Car
During high speed, if the speed change from accel to high speed or from high speed to decel can
be felt excessively in the car:
• Check Jerk settings. See S-Curve on page 2-11. Lower values result in smoother transi-
tions.
• MAGNETEK: Consider Estimation of System Inertia, A0/A1 Response, A0/A1 Inner Loop
Xover, A0/A1 Gain Reduce Mult, and A1/A0 Gain Chng Level.
• TORQMAX: Consider Inertia Learn.
•
Car Overshoots or Motor Overload/Overvolt
• Refer to drive manual for error definition and troubleshooting instructions
• Check counterweighting is correct.
• Decrease Standard Acceleration, Standard Deceleration, Standard Roll Jerk, and Standard
Stop Jerk.
• Increase drive gains, Magnetek A0/A1 RESPONSE, TORQMAX LC03, LC04, LC08, LC09.
• Shut off power. Wait 1 minute to drain DC voltage from dynamic braking circuit. Verify no
DC voltage with voltmeter.
• Check value of braking resistance (RB resistors, approximately 3 times the measured
brake coil resistance is a good starting point). Check brake circuit connections and brake
resistor slip rings.
Car Oscillates at Contract Speed
• Verify all motor parameters correctly set and encoder mounted securely (no vibration).
• Magnetek: Verify Estimation of System Inertia, A0/A1 Inner Loop Xover, A0/A1 Gain
Reduce Mult, and A0/A1 Gain Chng Level. Verify A0/A1 Response is not set too high.
• TORQMAX: Verify LC03, LC04, LC08, and LC09 are not set too high.
Electrical Noise
If the motor makes excessive electrical noise or draws higher than normal current:
1. Check Encoder Polarity.
2. Check TORQMAX LE04 Encoder 1 Sample Rate (Home > Prog > Encoder). Try chang-
ing it from 4 to 8 or from 8 to 16.
3. Check TORQMAX LC44. Try changing to a value other than 0 (Home > Prog > Control
Settings).
4. Verify traction sheave diameter and correct entry in drive parameters.
5. Verify machine gear reduction ratio and correct entry in drive parameters.
6. Verify rated motor speed and correct entry in drive parameters.
7. Verify acceleration and deceleration integral and proportional gain drive settings.
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