There are several different LEDs located on the PSS8 TRINITY control board that show controller component status and can also be used to help troubleshoot problems.

  • An AMBER LED next to the reset switch (L71)
  • A GREEN Power LED (L2)
  • A Touch Screen RED Receive LED (L61)
  • A Touch Screen GREEN Transmit LED (L60)
  • Four status LEDs (GREEN, RED, YELLOW, and ORANGE) (L64-L67)
  • Several small RED status LEDs for OPTO-22 board to PSS8 controller communications. (L39-L50) (L3-L26)

The printed labels on the control board identifying the LEDs are shown in parenthesis.

LEDs On During Normal Operation

Under normal operations, the following LEDs are lit on the Trinity board:

  1. Power LED – small green LED, normally On
  2. Status LED – small green blinking LED
  3. Touch Screen Transmit LED – small green blinking LED
  4. Touch Screen Receive LED – small red blinking LED
  5. Opto-22 Activity LEDs – two (or more) small red LEDs
  6. Reset Switch LED – large amber LED, normally On

If one or more LEDs are not lit as described above, then a problem or potential problem exists.

As an obvious example, if the Power LED is not On, then there is a problem with the connection or the power supply.

Other than power, the next area to evaluate for indications of controller problems is the four status LEDs.

Four Status LEDs

The four status LEDs (L64-L67) provide a simple way to gain useful information about the state of the control board. Table 1 shows the various states the LEDs may indicate.

The four status LEDs on the Trinity board are located immediately to the left of the large flat square CPU chip. Refer to Photo 1 to see the location of the LEDs.

Normally, the top LED (L64) will be blinking green, indicating normal operation. The next three LEDs in descending order are: Yellow, Orange, and then Red.

These other three LEDs may be On if an abnormal condition occurs. The table below indicates possible reasons the other LEDs may be lit.

Table 1: LED Status Conditions

XNormal Mode
XXIdle Mode
XXMaintenance Mode
XXXCycle Mode
XXException Mode
XXProgram has errors
XSoftware has stopped
NOLEDsClock is not correct

X = LED is on.

  • Normal mode – Everything is operating as expected
  • Idle mode – The touch screen is being used, but no other operations are happening
  • Cycle mode – The control board is running a cycle
  • Exception mode – Some error has occurred such as an alarm or E-stop
  • Program has errors – One or more values are out of range in the program
  • Software has stopped – A fatal error has been encountered during program operation
  • Clock is not correct – the clock needs to be set via the maintenance screen

ADD PHOTOS Photo 1 – Status LEDs – Main Board

Troubleshooting Using the LEDs

Green Status LED (L64) On and Steady, No Other Status LEDs On

If the green status LED (L64) is On and steady, then the control board has come to a halt or an error state. Usually, just pressing the small reset button on the control board (the amber LED will go out while the reset button is held down) for 2-3 seconds and releasing it will clear the problem. On rare occasions, the control box will have to be powered off for 30 seconds using the yellow toggle power switch to allow the CPU to clear its registers.

Green Status LED (L64) On and Steady, Other Status LEDs On

If there are other status LEDs lit, and a reset does not clear them, then there is a problem with the controller program chip or the board configuration. At this point, it is recommended to contact PRIMUS to discuss possible replacement of the controller chip

Green Status LED (L64) Blinking Steadily But Touch Screen Not Responsive

If the green status LED (L64) is blinking steadily, but the touch screen is not responding, the first thing to check is the green and red LEDs (L60 and L61) next to the touch screen connector (TS1). Refer to Photo 2 for the location of the two LEDs.

Photo 2 – Touch Screen Status LEDs – Main Board

  • Red blinking receive LED (L61) indicates the touch screen is trying to communicate with the control board.
  • A green blinking transmit LED (L60) indicates the control board is communicating with the touch screen.
  • If the green transmit LED (L60) is not On, the control board and touch screen are out of sync. Simply press the reset button, hold for 2-3 seconds, and release. The board should now synch with the touch screen and the green transmit LED (L61) next to the TS1 connector will start blinking.

Opto-22 Status LEDs L36 and L50 Not On

If the two LEDs, L36 and L50 are not On, then there is a problem communicating with the Opto-22 board or the ribbon cable is defective or loose. L36 and L50 are the E-stop relay LEDs and should normally be lit unless the E-stop has been pressed.

Power LED On, No Other LEDs Lit

If the Power LED is On, but no other LEDs are lit, then there is a problem with the control board and PRIMUS should be contacted for assistance.

Have a question or having difficulties? Talk to Dave Schall, our PRIMUS sterilizer expert who is here to assist you anytime at 877.679.7800 extension 1212 or email at dschall@spire-is.com.

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