IMPULSE
®
•G+ & VG+ Series 4 Technical Manual
November 2020
Page 215
6.2.7 Alarm Code: BE8–Brake Slipping Alarm
6.2.7.1 Definition
The BE8 alarm indicates that the VFD has detected that the brake slipping after the brake is set. A BE8 alarm will
occur if the VFD detects that the load is moving greater than the brake Slip Detection Speed (C08-23) when the
brake is set. When this occurs, the VFD will go into load float while the brake is set.
NOTE: This alarm 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.
6.2.7.2 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 the
brake is set.
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 BE8 fault. Repairs to the encoder wheel or shaft coupling
should be made immediately before again attempting to operate the hoist.
4. If none of the above steps has identified a valid problem(s), the brake may need to be replaced.
NOTE: It is desirable to have as fast a fault reaction time as possible without causing nuisance trips.
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