38
XYZ Machine Tools
ProTURN SLX 1630 ProtoTRAK SLX CNC Safety, Installation, Service & Parts List Manual
4.4.3 Encoder Counts to Pendant
Before replacing the motor due to a bad motor encoder it is a good idea to check the
cables that take those signals back to the pendant. If these signals are not getting
back to the pendant then the axis will fault. Check the following cable connections.
Umbilical #1 and #2 at the cable breakout box
Umbilical #1 and #2 at the pendant
Umbilical #1 carries the X-axis signals and Umbilical #2 carries the Z-axis signal.
4.4.4 Moving Problem from One Axis to Another
Another way to troubleshoot a problem with a particular axis is to swap parts from 1
axis to another to see if the problem moves. If the problem moves then that
component is faulty. See the example below.
Symptom – X Axis will not move and faults
This particular problem can happen because of any of following reasons: bad motor,
servo driver, power cable, or computer module. In some cases it is not always
obvious which component is causing the problem. This example will help us pinpoint
the problem through a trial and error process.
Let’s assume we have narrowed it down to the servo or electrical systems and the X-
axis has no problems. Lets also assume it is not an obvious problem like a loose
connection. This particular example was done on a machine with motor encoders
only.
Swap these components
Results
Physically switch the X and Z
motors
Has problem moved to Z-axis? If yes, replace motor. If no,
the motor is not the problem.
4.5 Servo Drivers
The two (2) servo drivers are located in the electrical cabinet.
Indications:
Problems moving just one axis. The axis faults out on the screen.
Servo Types:
X is a light duty driver
Z is a heavy duty driver
Objective:
Isolate the problem to the particular Servo Driver
Steps:
1.
Turn off and unplug the system.
2.
Physically swap the servo module from the axis that is not working to one that is.
WARNING!
Do not work with the Servo Driver unless the power is disconnected from the machine. There is
possibility of death by electrocution!
