Magnetek IMPULSE VG+ Series 3, Instruction Manual

Page: 163 / 183

IMPULSE•VG+ Series 3 Instruction Manual – 07/25/05
6-14
6. After corrective action has been taken and the fault no longer occurs then the load float time, C8-
10, can be set back to initial value.
Fault Code: BE1–Torque Proving Fault
Definition
The BE1 fault indicates that the drive has released the brake, but has not started to accelerate the
motor when it detects more than the expected encoder feedback. A BE1 fault will occur if the pulses
received during the BE1 detection time (C8-04) are greater than the expected number of pulses (C8-
05). This is typically caused by the drive/motor have insufficient torque to suspend the load.
Correction Action
1. 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.
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 drive may get erratic pulse signals possibly causing a BE1 fault. Repairs to
the encoder wheel or shaft coupling should be made immediately before again attempting to
operate the hoist.
3. If none of the above steps has identified a valid problem(s), only then should the BE1 detection
parameters be adjusted.
NOTE: It is desirable to have as fast a fault reaction time as possible without causing
nuisance trips.
4. Increase C8-05 to no more than 800.
Fault Code: BE3–Brake Release Fault
Definition
The BE3 fault indicates that the drive has released the brake and commanded the drive to run, but
has not detected the expected encoder feedback. A BE3 fault will occur if the pulses received during
the BE3 detection time (C8-06) are less than the expected number of pulses (C8-07).
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.
Corrective Action
1. Check the brake for proper operation. If the brake does not open the drive 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 drive 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.