Corrective Action
• Check switches, fuses, breakers, interlocks, limits, connectors,
etc. for energized condition and proper connection.
• Measure power upstream for required level. Check part number for input power required.
• Check wire size.
• Check for bad or incorrect connections.
• Check comms setup menu and set to correct address.
• Check comms setup menu and set to correct baud rate.
• Look for a break in the daisy chain.
• Verify correct connections and test wiring paths.
• Check converter box wiring and its documentation.
• Reconfigure computer's COM port setup and verify communications ok.
• Check the communication card documentation for setable variables and operational testing.
• Restart COMS software and check for settings agreement. Verify the COM bus is active.
• Verify operation with Watlow comms tool.
• Check sensor connections.
• Check sensor connections and sensor wiring.
• Change the Sensor Type parameter to match the sensor hardware.
• Measure power upstream for required level. Check part number for power requirements.
• Verify that the temperature surrounding the controller is 32 to 149°F (0 to 65°C).
•
Check sensor function. The Open Loop Detect parameter indicates it may be broken.
• Check the Calibration Offset parameter value; set it to a lower level.
• Configure output as an alarm.
• Check alarm set points.
• To clear the alarm, correct the alarm condition; check to see if the alarm is latched.
• Check the alarm sides setting.
• Check the alarm type setting.
• Check the alarm logic for compatibility with system peripherals and annunciators.
• Check the power limit setting.
• Check the operation mode.
• Check the alarm output function.
• Check the °C or°F setting.
• Check the calibration offset value; set it to a lower level.
• Cycle power to unit. If problem persists, return unit to factory.
• Cycle power to unit.
• Cycle power to unit. If problem persists, return unit to factory.
• Cycle power to unit. If problem persists, return unit to factory.
• Module defective, replace or verify module configuration.
• Return unit to factory.
• Cycle power to unit.
• Cycle power to unit.
• Recalibrate unit.
• Cycle power to unit. If problem persists, return unit to factory.
• Cycle power to unit. If problem persists, return unit to factory.
• Cycle power to unit. If problem persists, return unit to factory.
• Cycle power to unit. If problem persists, return unit to factory.
Watlow Series 97 Appendix ■ A.3
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