Parker PAC, Installation Manual, Page: 178 / 197

TROUBLESHOOTING
178 Parker Automation Controller Installation Guide
Troubleshooting Overview
The PAC Controller features LEDs on the front panel of the Controller and PACIO Modules which provide
quick identification of the device status. After installation, if your Controller does not function properly, use
the guidelines and procedures in this chapter to troubleshoot. These guidelines also apply to
troubleshooting a malfunction during normal operation of the Controller.
First Troubleshooting Steps
The first step in troubleshooting is to check the power-status LED on the front panel of the Controller.
The table below describes the normal operational states of the Power LED and troubleshooting actions.
Power LED What It Means
Off
The PAC detects no power source.

Verify that the power source meets the requirements.

Check for disconnected power cable, blown fuses, and so forth.
Green/Blue Normal operation
Red
24V is present, but an internal power rail has malfunctioned.

Contact Parker Hannifin Technical Assistance.
General Troubleshooting Procedures
Use the following list as a guideline for troubleshooting. The remaining sections of this chapter provide
procedures for each of the guidelines in the list.
1.
Check the status-indicator LEDs for power.
2.
Check the Run/Stop and Error LEDs to determine where the PAC is in the Boot/Runtime
sequence (see table below).
3.
Check the FAQs at www.parkermotion.com .
LED Status Indicators
General Status LEDs
General Troubleshooting
None of the LEDs are illuminated Check wiring, fuses, and input power.
Power LED does not turn blue Check wiring, fuses, and input power.
Power LED is Red Internal power supply is not functioning.
Error LED is Red
Refer to the Error LED information (information
below)
Program is not running Check the Run/Stop LED status (table below).
Power LED is Blue
End State Status: Run/stop is red, green or off, error
is off.
No end state is achieved
Check the LED sequence table to determine where it
stops.
Power LED does not illuminate Check wiring, fuses, and input power.