Shut Down Alarms - Conair 150 User Manual

When supplied for central
drying applications, these
shutdown alarms are not
available.
Problem
Process High Temperature –
If the process temperature
exceeds the process high tem-
perature setpoint, it shuts
down the dryer. Defaults are
set to 385°F {196°C} for
20 seconds.
Process Temperature Loop
Break – If the process tem-
perature is outside of the oper-
ator 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 3°F {3°C} over
20 seconds.
S h u t d o w n A l a r m s
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.
Possible cause
The process high temperature setpoint is
not at least 10°F {6°C} above the drying
setpoint.
One of the process solid state relays has
failed.
The air lines are restricted or loose.
The process setpoint is too low.
The process heater output on the control
board has failed.
Process RTD is loose or has fallen out.
The process heater has failed.
The air lines are restricted or loose.
The process blower is not running or is
running in the wrong direction.
The process heater output on the board
has failed or the output fuse has failed.
Process setpoint is too low.
Setback setpoint is too low.
Solution
Reset the process high temperature
setpoint at least 10°F {6°C} above the
drying setpoint.
Replace the solid state relay.
Straighten any crimps in the hoses.
Tighten any loose hoses.
Set the process setpoint higher or install
an optional precooler.
Replace the control board.
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.
Correct the cause of the non-running
blower (blown fuse, etc.) or reverse the
rotation of the blower.
Replace the board or the fuse for the
output.
Adjust the setpoint or add a precooler.
Adjust the setpoint or add a precooler.
Tr o u b l e s h o o t i n g l 6 - 5