Elevator troubleshooting tips

02/09/2018

This list is intended to offer suggestions for steps to take to fix some common elevator drive problems. The parameters and setting that are suggested for change, vary between drive manufacturers.

If no performance change is observed after any one step, set any changed value back to the original value before proceeding onto the next step.

Stalling Attempting to Lift Load

If the motor stalls as it attempts to lift the load

1. Increase the Torque Boost Gain parameter

2. Adjust the Motor Stator Resistance parameter

3. Adjust the Motor Mid Voltage parameter

Note: Avoid increasing the MOTOR MID VOLTS parameter too high, since this effects stopping performance (i.e. coming into the floor too fast) or can create Overcurrent Faults

Rollback or Bump at Start

If rollback is observed or a bump is felt at the start:

1. Verify Mechanical Brake Timing

2. Increase DC Injection Start Level

Decreasing Take-off Time

The following can help to decrease take-off time:

1. Increase DC Injection Start Level

2. Increase the Accel S-curve parameters

3. Increase the Torque Boost Gain parameter

Note: When increasing the torque boost, watch for Overcurrent Faults or decreased ride quality. If these occur, set the gain back.

Overcurrent Fault

If an “OVERCURR FLT” occurs it can indicate the s-curve settings are too high (jerk, accel, decel rates) or too much motor voltage is generated:

1. Verify Mechanical Brake Timing

2. Verify Torque Limits

3. Decrease the S-curve parameters

4. Verify Motor Min/Mid Voltage parameters

5. Measure the Motor’s Stator Resistance

6. Decrease the Torque Boost

Spotting or Stalling Going into Leveling

If the motor stalls or spots as it transitions from deceleration to leveling speed:

1. Decrease Decel Jerk Out and Decel Rates

2. Increase the Torque Boost Gain parameter

3. Measure the Stator Resistance

4. Adjust the Motor Mid Volts parameter

Coming into Floor Too Fast

If the car is coming into the floor too fast:

1. Decrease Decel Jerk Out and Decel Rates

2. Decrease Motor Mid Voltage parameter

Leveling Times Different Up vs Down

If the elevator exhibits significantly different leveling speeds/times up vs down:

1. Verify the Slip Compensation parameters

2. Complete Motor RPM Adjustment Procedure

Leveling Oscillation

If the elevator exhibits a leveling speed oscillation:

1. Increase the Hunt Prevention Time Parameter

2. Decrease Distortion Loop Gain parameters

Bump at Stop

If a bump is felt at the stop:

1. Verify Mechanical Brake Timing

2. Decrease Decel Jerk Out Rate

3. Decrease DC Injection Stop Frequency

Undershooting Floor

If the car is undershooting the floor:

1. Verify Mechanical Brake Timing

2. Increase Leveling Speed

3. Decrease Decel Jerk Out and Decel Rates

Overshooting Floor

If the car is overshooting the floor:

1. Verify Mechanical Brake Timing

2. Decrease Leveling Speed

3. Increase Decel Jerk Out and Decel Rates

4. Decrease Motor Mid Voltage parameter

Rollback at Stop

If rollback is observed at the stop:

1. Verify Mechanical Brake Timing

2. Decrease Decel Jerk Out Rate

3. Increase DC Injection Stop Level

If these suggestions do not solve the issue you're having with your elevator drive, you may be in need of more extensive repairs. In this case, call on the elevator drive repair experts at Precision Electronic Services at 800-732-4695.

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