Alarm Code: Be6-Brake Proving Alarm; Alarm Code: Be8-Brake Slipping Alarm - Magnetek Impulse G+ series 4 Instruction Manual

Alarm Code: BE6–Brake Proving Alarm
Definition
The BE6 alarm indicates that the drive 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
drive 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.
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.
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
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 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:
5. Ensure that C08-11 is equal to the brake's mechanical delay time.
6. Increase the value of C08-13.
Alarm Code: BE8–Brake Slipping Alarm
Definition
The BE8 alarm indicates that the drive has detected that the brake slipping after the brake is set. A
BE8 alarm will occur if the drive detects that the load is moving greater than the brake Slip Detection
Speed (C08-23) when the brake is set. When this occurs, the drive 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.
IMPULSE®•G+ & VG+ Series 4 Instruction Manual – February 2017
6-20
It is desirable to have as fast a fault reaction time as possible without causing
nuisance trips.