IMPULSE® •Series 5 AC Variable Frequency Drives: BE Alarms Explained Part 1 | CMCO

Troubleshooting BE Alarms in VG+ Drives

1. Introduction
This SOP provides a step-by-step guide to understand the unique alarm condition sequence at the start and stop of each run command in Magnetek VG+ drives. These alarm conditions define issues with safety on a hoist motion.

2. Procedure

2.1 The Alarm Codes
All Magnetek VG+ drives have four standard alarm conditions in earlier versions (Series 2, Series 3, and Series 4 VG+ drives) and an optional alarm condition in later versions (Series 4 and Series 5 VG+ drives)

2.2 Alarm Conditions

BE2 Alarm (Torque Proving)
The BE2 alarm indicates that there’s not enough torque in a motor before the holding brake is released.
The expected torque level of C08-16 while in the time window of C08-02 wasn’t reached.

BE1 Alarm (Rollback Detection)
The BE1 alarm indicates that there is too much movement after the holding brake has been released.
The number of pulses received from the encoder within the time window of C08-04 was greater than the expected number of pulses in C08-05.

BE3 Alarm (Brake release NG)
The BE3 alarm indicates that the motor is not rotating after the brake has been released.
The amount of pulses the drive receives from the encoder within the time window of C08-06 is less than the expected number of pulses in C08-07.

BE6 Alarm (Brake Slipping)
The BE6 alarm indicates that the drive has seen movement after the run command has been released and the holding brake has set. The number of pulses the drive is receiving from the encoder while in the time of C08-12 (BE6 detection time) is greater than the expected number of pulses (C08-13)
If this alarm is active, do not turn power off to the crane.

BE8 Alarm (Brake Slipping)
The BE8 alarm. The last code that can be turned on in either the Series 4 or Series 5 drive is a BE8 alarm. The drive will do this after it times out of the BE6 alarm detection time.
The BE8 alarm indicates that the drive has detected encoder feedback greater than C08-23 while not running. The drive will remain in Load Float and the brake will remain closed.
If this alarm is active, do not turn power off to the crane.

3. Conclusion
This SOP provides a basic guide to understand the alarm code sequence in Magnetek VG+ drives. Always ensure to follow the steps and in the manual in order to prevent any complications.

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