Graco Therm-O-Flow 20 EasyKey Instructions Manual page 34

Alarm Troubleshooting
Cause
With optional light tower, the yellow light illuminates and green light remains on if in run mode.
High Temperature - occurs when a zone temperature is above the setpoint plus warning deviation specified in the
zone tab of the setup screen.
Low temperature - occurs when a zone temperature is below the setpoint minus warning deviation specified in the
zone tab of the setup screen,
Drum Low - occurs when the pail low proximity sensor is activated due to the ram position.
Cause
With optional light tower, the red light illuminates.
High Temperature - occurs when a 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
two minutes while the system is in the Heat On state. This is the short circuit state o f an RTD sensor. Or when a
zone temperature exceeds 500°F (260°C). This is the open circuit state of an RTD sensor
Heat Control Error - occurs if the conductor relay on a temperature board is not closed when a zone of the temper-
ature board is enabled and in a heat state for the active unloader,
Communication Error occurs in the following conditions:
• Error 201 - The EasyKey does not communicate with the first Temperature PCB (201 position).
• Error 246 - The EasyKey does not communicate with the Unloader PCB (246 position).
• Error 300 - The EasyKey and another PCB have incompatible software.
If any of the above error codes are generated, contact a Graco customer service representative.
Cause
Drum Empty - occurs when the pail empty proximity sensor is activated for the ram position.
With optional light tower the yellow light begins flashing and the green light turns off.
Maintenance Call - occurs in advanced unit if user presses maintenance call button. See "Maintenance Call Kit
(253548)" on page 63 for additional information.
With optional light tower the yellow light turns on.
See "Light Tower Kit (253547)" on page 53 for additional information.
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Table 8: Therm-O-Flow Alarms
Warnings
Alarms
Events
312094K