Digital Temperature Controller Reference Manual

STEP 1:
INSTALLATION AND CALIBRATION
If the analog input (pin 18 of the rear connector) is in use, disconnect the wiring. If it is not
in use, connect the analog select input (pin 9) to digital 0 (pin 11). Switch off the line voltage
momentarily to make the analog input active.
STEP 2:
Short the analog select input (pin 18) to the analog 0 (pin 17).
STEP 3:
Program into zone A2 a temperature setpoint of 1100.0 oC. See DTC operating manual or
Touch Screen Display manual for programming instructions.
STEP 4:
Select Display of the paddle setpoint for zone A2.
STEP 5:
Place the probes of the Digital Voltmeter on the test points tp 1 and tp 2 of the board and
adjust R13 to give a reference voltage of 10.00V.
STEP 6:
Turn R12 (zero adjust) clockwise until the setpoint reading starts to decrease. Then turn R12
slowly counter-clockwise until the setpoint reading is 1100.0 oC.
STEP 7:
Remove the short circuit on the analog input and apply an input voltage of 5.000V to the
analog input (pin 18) with respect to analog 0 (pin 17). Adjust R11 (gain adjust) to give a
setpoint reading of 100.0 °C and repeat step 5.
STEP 8:
If the analog input is used, reconnect the analog input to the system. If the analog input is
not used, disconnect the short between the analog select input (pin 9) and digital 0 (pin 11)
and turn off the line voltage momentarily to make the analog input inactive.
4.2.3 Channel input board with cold junction board
The calibration of this board should not be attempted until the user is certain that the Analog
to Digital Converter board is correctly calibrated. See Figure 4-2 for the position of the
potentiometers.
STEP 1:
Display the three actual temperatures of the input board.
STEP 2:
On the Cold Junction Board short the inputs to the three thermocouple inputs.
STEP 3:
Adjust R26 (R25, R24 (zero adjust)) of the preamplifiers until they all show the same reading
on the display.
DIGITAL TEMPERATURE CONTROLLER REFERENCE MANUAL 4-3