Watlow PPC-2000 - Manual (Page 167)

Doc.# 30002-00 Rev 2.3 Watlow Anafaze 141
4
Troubleshooting
This chapter describes troubleshooting methods and fault
indicators that may be useful if you experience difficulties with
your PPC-2000 system. Appropriate remedial procedures are
detailed below.
General Description
The following LEDs light for status or diagnostic purposes:
• Green: Function operational, communications status (tx)
• Red: Fault
• Yellow: Communication status (rx)
• Orange: Processor reset due to low power condition or
watchdog timeout
PPC-2010 Processor
The processor provides a System OK circuit for monitoring
program and microcontroller integrity. The output of the
watchdog timer is available through the 50 pin I/O header on
the processor board. This is an open collector type output (up to
100mA) and will sink current to common when the processor is
operating properly. An open circuit indicates a processor
failure and remains open until proper operation is established.