AEC WD 350 through WD3000 Dehumidifying Dryers - Manual (Page 47)

350-2100 cfm Dryers Chapter 6: Maintenance 46 of 58
Figure 8: Process Temperature Control Error Messages
Message Cause Control Output Alarm Output
With output unit
other than current
output unit
With current output unit
Input temperature
has risen beyond the
upper limit of the
temperature range
by more than 20
°C
[68 °F] c
OFF during
reverse (heating)
action, ON during
normal cooling
action. 4 mA during reverse
(heating) action, 20 mA
during normal (cooling)
action.
Issues alarm
outputs in
accordance with the
set alarm mode.
Input temperature
has fallen below the
lower limit of the
temperature range
by more than 20
°C
[68 °F] d
ON during reverse
(heating) action,
OFF during
normal (cooling)
action. 20 mA during reverse
(heating) action, 4 mA
during normal (cooling)
action.
Issues alarm
outputs in
accordance with the
set alarm mode.
The thermocouple
has burned out or
the short circuit bar
has been removed.
The platinum RTD
has burned out or A
and B have been
short circuited.
OFF Approximately 1 mA
Issues alarm
outputs in
accordance with the
set alarm mode.
Proportional alarm
output is OFF
[FLASHES]
Memory failure
(E111) or analog to
digital converter
failure (E333) has
occurred.
Temperature
controller must be
repaired if recovery
is not made by
turning power off
once and on again.
OFF Approximately 1 mA OFF
c
When a type J thermocouple is used, this error message is not displayed until the temperature has risen above the normal operating
temperature operating range by more than 70 °C [158°F].
d
When a platinum RTD sensor is used, this message is displayed when the temperature has fallen to -99.9 °C [-147.82°F].