IMPULSE•G+/VG+ Series 4 Technical Manual
November 2022
Page 112
5.2.27 Index Control
Index Control is an IMPULSE•VG+ Series 4 feature that allows for precise movement of the motor each time a run
command is applied and the Index function is enabled by a digital input (H01-xx = 60).
The total distance (Pulses) the motor will index is determined by the following equation:
When Index is turned ON, it can be programmed to repeat as long as the Run command is enabled and by setting
the Index Repeat Delay (C13-06) greater than 0.00 seconds. The Index will repeat after the Index Repeat Delay
(C13-06) time has expired. Once the motor completes the Index, the brake will either set or remain in Load Float
depending on the braking sequence described below.
When an Index is complete, a digital output (H02-xx = 34) will turn ON until one of the following is true:
•
another directional run input is received,
•
the repeat delay time has expired and the movement is repeating, or
•
the Index Function is disabled.
When Applied in Traverse (A01-03 = 0)
When Index is turned ON, Index Brake Control (C13-12) controls the action of the brake. The following describes
the brake control for each setting:
Open on Index Command (C13-12 = 0)
When Index is turned ON, the brake will release and hold the position in Load Float until a run command is applied.
The brake will set and resume normal operation when the Index input is turned OFF.
Open on Each Run (C13-12 = 1)
When Index is turned ON, the brake will release after each run command is applied, then Index the motor. The
brake will set after the Index or Index Repeat is complete, or the run command is removed.
Latch Open on Run (C13-12 = 2)
When Index is turned ON, the brake will release when a run command is applied, and the VFD will Index the motor
and will hold position in Load Float after Index is complete. It will remain in Load Float until the next run command
or the Index input is turned OFF. The brake will set and resume normal operation when the Index input is turned
OFF.
NOTE:
For best performance, enable Index after brake release. Not recommended for double A4 applications.
When Applied in NLB Hoist (A01-03 = 2)
When Index Brake Control C13-12 = 2, the action of the brake is controlled by the No-Load Brake sequence. The
Index function can be enabled at any time during operation.
At Stop
If Index is turned ON while the crane is stopped, the brake will release when a run command is applied. The VFD
will Index the motor and will hold position in Load Float after Index is complete. It will remain in Load Float until the
next run command or the Index input is turned OFF. When Index is turned OFF, the brake will set according to the
No-Load Brake stop sequence.
During Run
If the motor is in motion when Index is turned ON, the VFD will decelerate to zero and hold the position in Load
Float. After a Run command is applied, the VFD will Index the load and hold the position in Load Float after the
Index is complete. The brake is set according to the No-Load Brake stop sequence when Index is turned OFF.
NOTE:
For best performance, enable Index after brake release. Not recommended for double A4 applications.
Total distance
(Pulses) = [
F01-01
(
Pulse
/
Rev
) *
C13-04
(Revs)] +
C13-05
(Pulses)
