IMPULSE
®
•G+ & VG+ Series 4 Technical Manual
November 2020
Page 214
6.2.6 Alarm Code: BE6–Brake Proving Alarm
6.2.6.1 Definition
The BE6 alarm indicates that the VFD has commanded the brake to set but it has detected more encoder pulse
feedback than expected. A BE6 alarm will occur if the number of pulses received during the BE6 detection time
(C08-12) is greater than the expected number of pulses (C08-13). The VFD will initiate Load Float for the duration
of the BE6 alarm.
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.
NOTE: The BE6-Brake Proving Alarm is re-verified during every brake set, including brake sets that occur after the
BE6 alarm is posted. The BE6 alarm will turn off if a successful brake check occurs after an initial
BE6 alarm condition is posted based on the setting of C08-19.
6.2.6.2 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 during the
detection time to exceed the set point.
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 BE6 alarm. 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), only then should the BE6 detection parameters be
adjusted.
NOTE: It is desirable to have as fast a fault reaction time as possible without causing nuisance trips.
5. Ensure that C08-11 is equal to the brake’s mechanical delay time.
6. Increase the value of C08-13.
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