IMPULSE
®
•G+ & VG+ Series 4 Technical Manual
November 2020
Page 213
5. 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 the Current Feedback Timer set as low as possible without causing nuisance trips.
6.2.5 Fault Code: BE3–Brake Release Fault
6.2.5.1 Definition
The BE3 fault indicates that the VFD has released the brake and commanded the VFD to run, but has not detected
the expected encoder feedback. A BE3 fault will occur if the pulses received during the BE3 detection time (C08-
06) are less than the expected number of pulses (C08-07).
NOTE: Depending on the condition of the crane and control system, the load may drift during the BE3 detection
time until the brake is again set. If giving a run command, the BE3 fault should be detected before a PGO
fault would be detected.
6.2.5.2 Corrective Action
1. Check the brake for proper operation. If the brake does not open the VFD will not see the proper number of
encoder pulses returned and will post this fault.
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 will get erratic pulse signals or no signals at all possibly causing a BE3 fault. Repairs to the encoder wheel
or shaft coupling should be made immediately before again attempting to operate the hoist.
3. If the encoder appears to have no mechanical problems, the encoder cable should be checked for damage and
replaced if a problem is found.
• Each of the encoder wires should be checked for continuity.
• The wires should be checked for shorts between any two wires.
• The wires should be checked for shorts to the shield or ground.
• Visually inspect the cable for damage that may be causing intermittent problems.
4. If none of the above steps has identified a valid problem(s), only then should the BE3 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 C08-04 is equal to the brake’s mechanical delay time.
6. Increase the value of C08-06 to no more than 1 second.
7. Decrease the value of C08-07 to no less than 10 pulses.
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