Periodically, issues are encountered in the field when replacing control boards. Many of these problems are self-inflicted and can be prevented by following the simple precautions listed below.

This guidance was developed in conjunction with the PRIMUS control board supplier and addresses potential problems caused by electrostatic discharge (ESD) as well as other issues.

While largely germane to all control boards, this Blog specifically pertains to the PSS500 control board.

Electrostatic Discharge (ESD)

ESD is the sudden flow of electricity between two objects caused by contact or an electrical short. ESD is often caused by a buildup of static electricity.

ESD includes electric sparks, but also less dramatic forms which may be neither seen nor heard, but are large enough to cause damage to sensitive electronic devices. ESD can cause a range of harmful effects such as the failure of solid-state electronics components such as integrated circuits. These can suffer permanent damage when subjected to high voltages.

At our factories, PRIMUS has established electrostatic protective areas free of static in the control box assembly areas. This has been accomplished by implementing measures to remove static such as grounding electronics technicians, providing antistatic devices, and controlling humidity.

Installation Guidance

When ordering a new controller, make sure to provide the sterilizer Job Number and/or Serial Number to PRIMUS. This will help PRIMUS set the jumpers before the board is sent out.

When installing the board, the technician must be grounded before handling the board. Only handle the control board by the edges.

Carefully remove the Operation and Calibration chips from the old control board. A chip puller works best and should be a part of every service technician’s tool kit.

Following the Caution note below, install the chips on the new control board while making sure not to bend any pins. Also, ensure the chips are placed in the right orientation.

The chip has a notch on one end. The notch must align as shown on the chip
location diagram orientation on the control board. Failure to properly align the
chip before turning on the power to the control box will destroy the software on
the chip. If this happens, the chip will not be warranted by PRIMUS and a new
chip must be ordered.

Make sure the nylon washers are located on the standoffs before installing the new controller.

When tightening the nuts and lock washers on the control board, care must be taken not to damage the jumpers or any other components near the mounting holes. Make sure the power is turned off at the circuit breaker on the control box before making any connections to the board.

When installing RTDs and/or a pressure transducer, make sure only the wire is placed in the terminal. If the insulated part of the wire is under the terminal, it can cause a bad or intermittent connection. This will cause the controller to appear to be defective.

Calibrate the controller by following the instructions in the PRIMUS Operator Manual. Set up and run customer cycles to make sure the controller is operating properly.

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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