IMPULSE•G+/VG+ Series 4 Technical Manual
November 2022
Page 96
5.2.15 Anti-Shock
Anti-Shock is a hoist feature on the IMPULSE•VG+ Series 4 VFD. The torque output of the hoist is continuously
monitored, and when it increases above a threshold (C07-15 and C07-16), the hoist automatically decelerates and
waits for the torque to stabilize before smoothly re-accelerating (C07-17 and C07-18). Anti-Shock is designed to
reduce crane structure fatigue.
Initial Setup and Adjustment
1. Choose an option to enable/disable Anti-Shock:
a. C07-12 = 0 (Disabled) ensures Anti-Shock does not function.
b. C07-12 = 1 (Enabled) allows Anti-Shock to run always.
c. C07-12 = 2 (Enbl, Not In MSpd) will block Anti-Shock when Micro-Speed is enabled.
d. H01-xx = 4B (Anti-Shock OFF), when enabled, will block Anti-Shock. This allows Anti-Shock to be enabled
or disabled by a digital input.
2. Run the hoist, unloaded, in the UP direction. Note the value of U01-09 and enter that value into C07-23.
To make Anti-Shock less sensitive to light loads and more sensitive to heavy loads:
1. Increasing C07-15 (Torque Delta) to a higher percentage increases the torque spike magnitude that is required
to trigger Anti-Shock.
2. Increasing C07-16 (Detection Time) to a higher time widens the window that a torque spike is looked for.
To make Anti-Shock more sensitive to light loads:
1. Decreasing C07-15 (Torque Delta) to a lower percentage lowers the torque increase magnitude that is required
to trigger Anti-Shock.
2. Increasing C07-16 (Detection Time) to a higher time widens the window that a torque spike is looked for.
Troubleshooting
Anti-Shock is triggered when the load is already in the air:
Cause:
This is caused by a torque increase due to acceleration, which falls within the parameter settings for
triggering Anti-Shock.
Corrective Action:
1. Increasing C07-14 (Re-Accel Delay) to a higher time delay.
2. Increasing C07-15 (Torque Delta) and decreasing C07-16 (Detection Time) will require a higher torque spike to
occur in a shorter amount of time.
When Anti-Shock is triggered, the VFD faults with an OV (Overvoltage) or OC (Overcurrent):
Cause:
By default, Anti-Shock is configured to decelerate very quickly when a torque spike is detected. The
deceleration rate may cause a rapid increase in voltage or current, which may fault the VFD.
Corrective Action:
Increasing C07-18 (Smoothing Decel) will increase the time it takes for the motor to decelerate directly after the
torque spike is detected. Resulting spikes in voltage and/or current will be reduced.
Содержание Impulse G+ series 4
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