Section 4
Troubleshooting and Maintenance
Troubleshooting and Maintenance 4-1
MN1269
Overview
This troubleshooting section describes the symptoms of possible malfunctions along with
information needed to check and correct the causes of a fault. Using the four LED fault
indicators on the Servo Control Card and a VOM can identify most of the faults.
Unless the cause of a malfunction is obvious and readily correctable, replace the servo
control card with a new one. This will get the system running most quickly and reduce
equipment down time.
Under no circumstances should you modify or replace any components. This could
compound the problem as well as voiding the warranty.
If a problem develops in a system that was previously operating well, do not make any
adjustments without first diagnosing the cause or causes. To arbitrarily readjust the unit
will only compound the problem.
Work from the four LED indicators and from the troubleshooting table in this section.
Initial Checks
Begin your troubleshooting with a systematic and complete check of power lines and
input signals to the servo control.
WARNING: Do not touch any circuit board, power device or electrical
connection before you first ensure that power has been
disconnected and there is no high voltage present from this
equipment or other equipment to which it is connected. Electrical
shock can cause serious or fatal injury. Only qualified personnel
should attempt the start–up procedure or troubleshoot this
equipment.
WARNING: Do not remove cover for at least five (5) minutes after AC power is
disconnected to allow capacitors to discharge. Electrical shock can
cause serious or fatal injury.
1.
Check input speed command signals. Determine that they reach the servo
control input connector.
2.
Check the external limit switches if used to determine that they are functioning
properly.
3.
Check the 115 VAC power to determine that it is correct.
4.
Check for open fuses and circuit breakers.
5.
Check for correct jumper positions.
6.
Check for damaged control or equipment wiring.
7.
Check for loose or broken terminals.
8.
Check for abnormally hot components.
9.
Check for burned insulation or components.
Resetting the Servo Control To reset a servo control with a fault, the following procedure must be performed.
1.
Check over the servo control and wiring for obvious problems.
2.
Review the following troubleshooting table for a possible explanation of the
cause and corrective action to be taken.
3.
Reset the axis by either taking the reset line on the signal input connector and
touching it to common and releasing, or depressing the reset button.
Note: Remove incoming AC power before changing AC fuse. To gain access to
change fuse, press fuse holder cover to the side and lift up. Install new fuse
and press cover down securely to re–seat fuse cover, noting that it snaps
back in place. Re–apply incoming AC power.
Servo Systems Co. • 115 Main Road • P.O. Box 97 • Montville, NJ, 07045-0097
(973) 335-1007 • Toll Free: (800) 922-1103 • Fax: (973) 335-1661
www.servosystems.com
