Installation Manual

Troubleshooting 8-49
8.2 Troubleshooting the Servo Controller (PMAC)
To troubleshoot Programmable Multi-Axis Controller (PMAC) problems, refer to Table 8-18 for a
summary of the symptoms, probable causes, and fault isolation procedures. FmNT error messages
displayed on the Computer Monitor related to the PMAC are also discussed.
Table 8-18 Troubleshooting Summary – PMAC
Symptom Probable Cause Fault Isolation Procedure Subsection
PMAC fails to initialize Power Problem “Main Power and Initialization
Verification” in PMAC Initialization
Fault Isolation
8.2.1
FmNT Message 30796 “The
dispenser PMAC device
initialization has failed”
PMAC Watchdog
Error
“PMAC Watchdog Error
Verification” in PMAC Initialization
Fault Isolation
8.2.1
FmNT Message 30753 “The
motor failed to close”
XY Servo
Amplifier
XY Servo Amplifiers Fault Isolation 8.1.5
Following Error “PMAC Fatal Following Error
Verification” in PMAC Initialization
Fault Isolation
8.2.1
FmNT Message 30735 “The
motors have gone open
loop? Press OK to continue
and reinitialize the motion
controller” when clicking in
blue square in Jog Control
dialog box
Linear Encoder PMAC Linear Encoder Fault
Isolation
8.2.3
High vibration during X or Y-
axis movement
X or Y-axis
Rotary Encoder
“X-Axis Rotary Encoder
Verification” or “Y-Axis Rotary
Encoder Verification” in PMAC
Rotary Encoder Fault Isolation
8.2.2
High vibration during Z-axis
movement
Z-axis Rotary
Encoder
“Z-Axis Rotary Encoder
Verification” in PMAC Rotary
Encoder Fault Isolation
8.2.2
Fast movement in X or Y-axis
with no vibration before
Dispensing Head stop
Linear Encoder PMAC Linear Encoder Fault
Isolation
8.2.3
With power OFF, binding and
unusual noise when manually
moving the Dispensing Head
Mechanical
System
PMAC Mechanical Fault Isolation 8.2.4
Dispensing Head hits
mechanical hard stop during
homing process
Home Sensor PMAC Home Sensor Fault
Isolation
8.2.5
Problems resulting from environmental and applications abnormalities, spills, obstructions, and
workpiece irregularities that are not system related should be eliminated prior to undertaking more
advanced troubleshooting.
TIP To quickly identify problems, look for obvious signs such as burnt, discolored, missing,
damaged, or loose parts, obstructions, and foreign objects. Obvious uncharacteristic odor,
heat, noise, vibration, or movement can also be used to quickly isolate problems. If a
problem reoccurs frequently, there may be other root causes to the problem.