Magnetek IMPULSE VG+ Series 3, Instruction Manual

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IMPULSE•VG+ Series 3 Instruction Manual – 07/25/05
5-30
This condition indicates that the brake has failed and the drive / motor combination is
suspending the load. If, during this condition, the hoist is operated in the “Raise” direction, it
will only be allowed to run at a speed equal to or less than the “BE6 Up Speed” setting in
parameter C8-17 (C8-17 is 6Hz by default.) This is an additional indication that the brake has
failed open, or the load is slipping through the brake. It is recommended that the crane be
moved to a safe location and the load lowered to the ground. Corrective action should be taken
to repair the brake. The keypad will be displaying one of two alarms during this condition:
BE5 or BE6. Refer to “Troubleshooting the Drive” in Chapter 6 of this manual.
.
To enable BE6 detection, C8-12 must be greater than 0.
Parameter
Code
Display Function Range Initial Value
Access
Level
C8-01 Torque Comp Time Time for torque to build to
300% at start. 0.00–2.55 sec *1.0/1.5 Adv
C8-02 IFB OK Timer Sets the amount of time to
look for the current feedback
to be OK before posting a
BE2 fault. Setting this
parameter to 0 (Zero) will
disable torque proving at start
& eliminate BE2 detection
(Not recommended). 0.00–2.55 sec *1.0/1.5 Adv
C8-03 Min Brk Rel Torq Minimum brake release
torque. 0–300% 10 Adv
C8-04 Roll Back Timer Sets the amount of time for
the brake to release and for
brake feedback to be received
into the Brake Answer Back
Multi-Function input at start
before posting BE4 alarm. It is
also the time period during
which the amount of roll back
is checked. 0.00–2.55 sec 0.30 Adv
C8-05 Roll Back Count Detection counts for excessive
roll back. 0–16536 pulses 800 Adv
C8-06 BE3/Alt Torq Tim Time period during which C8-
07 is measured. Also see C8-
08. 0.00–2.55 sec 0.30 Adv
C8-07 BE3 Detect Count Detection count for Encoder/
Seized-Brake Fault (BE3). It
is the minimum encoder pulse
count, during the time period
of C8-06, below which the
BE3 alarm is triggered. 0–16536 pulses 25 Adv
WA R N I N G
DO NOT turn off power to the drive during a BE6 alarm. This may result in loss of control of
the load if the brake has failed in the open position or is unable to hold the load.
*Depends on drive size.