GE VMIVME-PS250-000 Matrix switch module

This chapter is a general guide for isolating system problems. The guide assumes that the system wiring, soldering connections, switch and relay contacts and input and output connections are correct and function properly. Make the checks in sequence. Various system checks assume that the prior checks have been done correctly.

Control Start-up 

When the control is powered on, the CPU begins execution of a section of the software program known as the boot code. This code performs hardware diagnostics and checks that a valid application program has been installed. During this period all control outputs will remain disabled. The boot code takes approximately 30 seconds to execute. During this period the red status LED should be on.

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