LEESON SCR Thyristor Motor Control - Manual (Page 55)

49 SPEEDMASTER™ OPERATION MANUAL
Warning
Dangerous voltages exist on the drive when it is powered.
When possible, disconnect the drive while troubleshooting.
High voltages can cause serious or fatal injury.
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Before troubleshooting
Perform the following steps before starting any procedure in this
section:
• Disconnect AC line voltage from the drive.
• Check the drive closely for damaged components.
• Check that no conductive or other foreign material has
become lodged on the printed circuit board.
• Verify that every connection is correct and in good
condition.
• Verify that there are no short circuits or grounded
connections.
• Check that the voltage switch settings match the AC line
and maximum armature output voltages.
• Check that the drive’s rated armature outputs are consistent
with the motor ratings.
Troubleshooting