Difference between revisions of "Motion fault limit paremeter"

Revision as of 23:33, 16 July 2012

The parameter called "motion fault limit" controls a safety faulting mechanism of GD servo drives.

Usage

Motion fault tries to detect incorrect motor behavior and sets drive in fault state if motion fault threshold exceeded. The motion fault will help to detect following fault scenarios:

• DC motor runaway when feedback is lost
• Motion blocked by obstacle and axis stops (can react faster than following/tracking error fault)
• Detect stall of stepping motor

How it works

Motion fault monitors three variables to determine fault:

• Actual velocity
• Time
• Output torque/current

Drive activates fault if output current is greater than set threshold value for over 0.2 second period and simultaneously velocity stays below a fixed threshold.

Parameters

Motion fault has only one changeable parameter: threshold. The threshold value controls the current level which must be exceeded to activate 0.2 second timer and velocity monitor.

Finding correct value

Correct value can be found by experimenting.

1. Set threshold to low starting value such as 500
2. Try settings

• Once you have threshold that sometimes triggers, sometimes not, increase threshold by 30-50% to sta

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