Parker Hannifin
Troubleshooting Table
This section includes a table of common problems and their solutions.
For locations of the ACR90x0 controllers’ status LEDs, and for non-problem indications, see Chapter 2,
Specifications, in the ACR9000 Hardware Installation Guide. Table 1 in this chapter only lists problem LED
indications.
PROBLEM CAUSE / VERIFICATION SOLUTION
Power Status LED
Power status LED is
not on
There is no power to the controller. Check for disconnected power cable.
Check for blown fuse.
Verify the power source meets requirements outlined in
Chapter 2, Specifications, of the ACR9000 Hardware
Installation Guide.
Power status LED is
steady red
There is inadequate power to the controller. 1. Verify the power source meets requirements outlined in
Chapter 2, Specifications, of the ACR9000 Hardware
Installation Guide.
2. Remove all cables except power.
If the LED turns green after removing the cables, re-
attach the cables one at a time to determine which
cable or device is causing the problem.
If the LED does not turn green, contact Parker
Technical Assistance.
Power status LED is
alternating red/green
Controller encountered error during boot process. Contact Parker Technical Assistance.
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