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AEC/Appllcatlon Engineering
Auto-Tuning the Control
0 Once the process has reached the set point, apply the smallest load the True Temp™ unit is
required to heat or cool. For example, put the process in Idle or Standby mode.
0
Press the
AT
key. The
AT
LED flashes, indicating that the control is tuning itself.
li1'I When the
AT
LED light stops flashing, the controller is tuned and ready for operation.
5-10 Restoring the Control to Factory Setup
I WARNING I
THE PUMP CONTINUES TO RUN IF YOU REMOVE THE
SLIDE-OUT CHASSIS WHILE THE PUMP IS RUNNING.
If pre-set parameters on the microprocessor control have been tampered with and it will no
longer control fluid temperature,
try
restoring the factory setup:
I . Tum off the power switch on the graphic display and remove all electrical power to the
TrueTempn• TOH unit.
2. Press up the latch at the bottom of the front panel and slide out the control chassis.
3. The slide-type lockout switch labeled
SW101 (PROTECT)
on the left
circuit board should be
OFF.
OF•[
Jo•
ProtKt (SWtOt)
4. Make sure that the control outputs are installed on the right-hand circuit board. True-
Temp™ TOH units use two E53-S solid state relays (SSRs) mounted in the sockets marked
5201 (HEAT) and 5202 (COOL).
These relays switch the heater and cooling valve on and off.
5.
Set output selector switches
SW202 and SW204 to PUL
(pulse) on units with a
standard solenoid cooling valve. These slide
type
switches are near the
PIA.
.cu•
control output sockets.
6. Set the rotary-type alarm mode selector switch to position
5.
The
selector switch is marked
SW203 [ALM)
and is on the right-hand
circuit board. Seven other alarm functions are available and listed on
the following page.
TOH TrueTemp"' Serles Hot
011
Temperature Control Units
:~:
.~
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SW>m[•LllJ
Page 39
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