Electrical Control Panel Troubleshooting
311513D
11
Electrical Control Panel Troubleshooting
Problem
Cause
Solution
Disconnect is ON, but EasyKey on
Therm-O-Flow has communication
error.
The ground fault interrupt activated.
Reset ground fault interrupt, page 10.
One or more fuses is blown.
Replace the blown fuse(s).
Communication cable disconnected.
Connect cable.
Warnings
Cause
With optional light tower, the yellow light illuminates and green light remains on if in Run mode.
Temperature Warning - occurs when a zone temperature is above/below the se/- warning deviation speci-
fied in the Zone tab of the Setup screen.
Alarms
Cause
With optional light tower, the red light illuminates.
High Temperature - occurs when the zone temperature is above the setpoint plus alarm deviation specified in the
Zone tab of the Setup screen.
Low Temperature - occurs when the zone temperature is below the setpoint minus alarm deviation specified in the
Zone tab of the Setup screen while the unloader is in the Run state.
Sensor Error occurs in the following conditions:
•
When an enabled zone does not increase in temperature within 7 minutes while the system is in the Heat On
state. This is the short circuit state of an RTD sensor.
•
When a zone temperature exceeds 500°F (260°C). This is the open circuit state of an RTD sensor.
Heater Error - occurs if the contactor relay on a temperature board is not closed when a zone of the temperature
board is enabled and in a heat state for the active unloader.
Communication Error - there are two possibilities:
•
Start up - Occurs if the EasyKey display board cannot communicate with any board in the system.
•
Normal Operation - occurs if any board in the system, including expansion enclosure, cannot communicate with
the EasyKey Display board.
Events
Cause
Maintenance - occurs in advanced unit if user presses maintenance call button. See Maintenance Call Kit in
Therm-O-Flow manual for additional information.
With optional light tower the yellow light turns on.
See Electrical Schematics in Therm-O-Flow manual for additional information.
