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AEC/Application Engineering
Figure 11
Process Temperature Control Error Messages
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Input temperature
''''
has nsen beyond the
OFF dunng reverse
4 mA dunng reverse
Issues alarm outputs
in
upper limrt of the
(heating) ad1on, ON
(heatmg) action,
20
accordance with the set
' ' ' '
temperature range
dunng normal coohng
mA during normal
alarm mode.
by more than 200C
adion.
(coolmg) action.
(68°F)
(D
Input temperature
has fallen below
the
ON during reverse
20 mA during reverse
Issues alarm outputs
1n
••••
lower limrt of the
(heating) action, OFF
(heabng) action, 4 mA
accordance wrth the set
temperature range
dunng normal (cooling)
dunng normal (coohng)
by more than 20'C
adion.
action.
alar.n mode.
(68°F)
Q)
The thennocouple
has burned out or
5.Err
the short circuit bar
Issues alarm outputs in
has been removed.
OFF
Approximately 1 mA
accordance with
the
set
The platinum RTD
alarm mode. Proportional
has burned out or A
alarm output is OFF
and B have been
short arcu1ted.
Memory failure
r
4 4 4
(E111) or analog to
digital converter
~
4 4 4
failure (E333) has
occurred
Temperature
OFF
Approximately 1 mA
OFF
'~3~
controller must
be
repaired
if
recovery
L~
~
lS not made by
(flashes)
turning power off
once and on again.
CD
When a type
J
thermocouple
1s
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).
Q)
When a platinum RTO sensor
1s
used, this message is displayed when
the
temperature has fallen to
-99.goc
(-147.82°F) .
TOH True Temp"' Series Hot Oil Temperature Control Units
Page 55
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