IMPULSE®•G+ & VG+ Series 4 Instruction Manual – February 2017
6-21
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.
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 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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