Magnetek IMPULSE G+ 4 Series User Manual

IMPULSE
®
•G+ & VG+ Series 4 Technical Manual
November 2020
Page 212
6.2.3 Fault Code: BE1–Rollback Fault
6.2.3.1 Definition
The BE1 fault indicates that the VFD 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
VFD/motor having insufficient torque to suspend the load.
6.2.3.2 Correction Action
1. Check the encoder cable for damage and proper grounding. Replace it if a problem is found.
• Each of the encoder signals should be checked for excessive noise.
• The shielded encoder cable should be properly grounded.
• 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
VFD 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: It is desirable to have as fast a fault reaction time as possible without causing nuisance trips.
4. Increase C08-05 to no more than 800 pulses.
6.2.4 Fault Code: BE2–Torque Proving Fault
6.2.4.1 Definition
The BE2 fault indicates that the VFD 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.
6.2.4.2 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.
• Each of the encoder signals should be checked for excessive noise.
• The shielded encoder cable should be properly grounded.
• 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 coupling
(depending on the type of encoder used). If the pulse wheel is misaligned or the shaft coupling is loose the
VFD may get erratic pulse signals possibly causing a BE2 fault. Repairs to the encoder wheel or shaft coupling
should be made immediately before again attempting to operate the hoist.
4. Perform a Brake Torque test to verify the braking torque compared to the brake specifications before
proceeding.

Magnetek IMPULSE G+ 4 Series Specifications

General

Brand	Magnetek
Model	IMPULSE G+ 4 Series
Category	DC Drives
Language	English