3.2.3 STEP ACTIVE LED Not On or Motor Doesnt Step - 5645 Does
Not Recognize Step Input or Defective Connection
Procedure
Follow this procedure if the step motor will not step or the STEP
LED will not light when an enable input and a motion command
is applied:
* Note: Be careful not to confuse the holding torque (due to
current in the windings and mechanical resistance) with the
detent torque (due to mechanical resistance only).
To feel the difference between the two, attempt to rotate the
shaft with power and enable applied. There should be high
resistance. Then, disable the drive or turn power Off and rotate
the motor shaft. There should be some resistance, but rotation
should occur.
Refer to section 3.2.2.
Is ENABLE LED On?
Refer to section 2.5.1 to check
wiring connection.
Internal failure. Contact
Pacific Scientific.
Is step rate below
maximum?
No
Yes
Yes
No
Reprogram valid step rate:
Step size Maximum
pulses/second:
full
40,000
1/2
80,000
1/5
100,000
1/25
500,000
1/125
500,000
No
Yes
Does motor have holding
torque?*
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5645 Installation and Hardware Manual
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