Central

When supplied for central drying applications, these shut down alarms are not available.

Shut Down Alarms

If the red Acknowledge Alarm LED is blinking, the alarm is a shutdown alarm. The dryer will shutdown automatically to prevent damage to the equipment or personnel. Note that once the Acknowledge Alarm button is pressed once, the blinking red LED becomes solid.

Problem

A1 Process High Temperature – If the process temperature exceeds the process high temperature set- point, it shuts down the dryer. Defaults are set to 385°F (196.1°C) for

20 sec.

A2 Process Temperature Loop Break – If the process temperature is outside of the operator entered deviation, alarm band (see Process High Temperature Deviation passive alarm) and the process tem- perature is not moving towards the setpoint at a rate greater than specified. It shuts down the dryer. Defaults are set at 37°F (3°C) over 10 sec.

A3 Process Heater High Temperature – The snap switch in the process heater tube opens due to excessive temperature.

Possible cause

The process high temperature setpoint is not at least 37°F (3°C) above the drying setpoint.

The RTD temperature probe is not installed correctly.

The air lines are restricted or loose.

Process RTD is loose or has fallen out.

The process heater has failed.

The air lines are restricted or loose.

There is an air flow blockage or loose hoses.

The isolation contactor failed in the closed position.

The heater solid state relays (SSRs) failed.

Solution

Reset the process high temperature set- point at least 37°F (3°C) above the dry- ing setpoint.

Make sure the RTD temperature probe tip is in the center of the hopper inlet tube.

Straighten any crimps in the hoses. Tighten any loose hoses.

Check the process RTD and tighten if needed.

Check the heater fuses, and resistance across each leg of the process heater.

Straighten any crimps in the hoses. Tighten any loose hoses.

Check that the bed plates are in the proper position (lined up with the hoses).

Tighten any loose hoses.

Replace the isolation contactor.

Replace the failed heater solid state relays (SSRs).

Troubleshooting

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Tr o u b l e s h o o t i n g l 6 - 5

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Conair 100, 25, 15, 50 specifications Shut Down Alarms, Problem, Possible cause, Solution
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50, 15, 100, 25 specifications

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