Fault Code: Be1-Rollback Fault; Fault Code: Be2-Torque Proving Fault - Magnetek Impulse G+ series 4 Instruction Manual

6. After corrective action has been taken and the fault no longer occurs then the load float time,
C08-10, can be set back to initial value.
Fault Code: BE1–Rollback Fault
Definition
The BE1 fault indicates that the drive has released the brake, but has not started to accelerate the
motor when it detects more than the expected encoder feedback. A BE1 fault will occur if the pulses
received during the BE1 detection time (C08-04) are greater than the expected number of pulses
(C08-05). This is typically caused by the drive/motor having insufficient torque to suspend the load.
Correction Action
1. Check the encoder cable for damage and proper grounding. Replace it if a problem is found.
1.1 Each of the encoder signals should be checked for excessive noise.
1.2 The shielded encoder cable should be properly grounded.
1.3 Visually inspect the cable for damage that may be causing intermittent problems.
2. Check the alignment of the encoder pulse wheel with the sensor head, or the encoder shaft
coupling (Depending on the type of encoder used). If the pulse wheel is misaligned or the shaft
coupling is loose the drive may get erratic pulse signals possibly causing a BE1 fault. Repairs to
the encoder wheel or shaft coupling should be made immediately before again attempting to
operate the hoist.
3. If none of the above steps has identified a valid problem(s), only then should the BE1 detection
parameters be adjusted.
NOTE:
4. Increase C08-05 to no more than 800 pulses.
Fault Code: BE2–Torque Proving Fault
Definition
The BE2 fault indicates that the drive was unable to develop sufficient torque before releasing the
brake. A BE2 fault occurs when the torque (U01-09) is less than the Initial Forward Brake Torque
(C08-16) during the current feedback timer (C08-02) at start. This typically indicates that the brake is
slipping while torque is building up in the motor before releasing the brake.
NOTE: This fault typically indicates a failed brake. Power should NOT be removed while this
alarm is active and the load should be moved to a safe location and lowered before
proceeding with any corrective action.
Corrective Action
1. Check the brake for proper operation and adjustment. If the brake does not set, is improperly
adjusted or is excessively worn, it may not be able to hold the load. This will allow the encoder
pulses received while torque is building up in the motor.
2. Check the encoder cable for damage and proper grounding. Replace it if a problem is found.
2.1 Each of the encoder signals should be checked for excessive noise.
2.2 The shielded encoder cable should be properly grounded.
2.3 Visually inspect the cable for damage that may be causing intermittent problems.
3. Check the alignment of the encoder pulse wheel with the sensor head, or the encoder shaft
IMPULSE®•G+ & VG+ Series 4 Instruction Manual – February 2017
6-18
It is desirable to have as fast a fault reaction time as possible without causing
nuisance trips.