Table of Contents
Advertisement
Resistance Signal
Optional Item Number 5415 board needed.
The configuration and calibration procedures used
for measuring pure resistance are the same as are
used to configure and calibrate a two wire RTD sen-
sor. However, in the setting configuration mode, the
"U1" sensor type parameter must be set to "12". See
the "U1" instructions on page 11. The unit will then
measure pure resistance from 0-1000 ohms.
3 Wire RTD Sensor
Note: For a 1000 ohm sensor, the DIP switches
should be OFF, OFF, OFF. For 100 ohm, check that
the DIP switches are ON, OFF, OFF (see page 13).
RTD devices are precise resistors whose resistance
value varies with temperature. The DE20 control mea-
sures the RTD resistance and compares that mea-
surement with a "standard" set of values stored in the
control memory. To restore, update or verify that this
"standard" set of values is correct, do the following:
Equipment needed:
1.
Two precision resistors (tolerance +/- 0.1%
or better) with a fixed value equal to the
nominal value of the RTD (i.e. 1000 ohms or
100 ohms).
2.
A suitable jumper cable to facilitate
changing input resistance.
3.
A short piece of jumper wire (simulates third
wire).
!
WARNING!
Calibration procedures require the removal of the
rear cover of the control. It also requires that power
is ON, exposing the technician to potentially lethal
voltages. Exercise EXTREME CARE and wear tested
electrician's gloves whenever power is on.
Calibration procedure for the 3 Wire RTD:
Step 1: Turn OFF all power.
Step 2: Remove rear cover.
Step 3: Remove RTD sensor.
Step 4: Install the short piece of jumper wire from ter-
minal #1 to #3.
Step 5: Install the precision resistors in place of the
RTD sensor, as shown in terminals #2 and #3.
-7-
Step 6: Install the jumper cable between the loose
end of one of the resistors and the fixed end of the
other resistor to establish an input value of a single
resistor (i.e. 1000 ohms or 100 ohms), as shown.
Step 7: Carefully restore power to the controller, en-
suring that you do not come in contact with any ex-
posed voltage.
Step 8: Press the decrease " " key and increase " "
buttons simultaneously and hold for approximately 6
seconds. The display will indicate "AC.0". While the
"0" is flashing, use the increase key to change this to
"22". Press the "SET" key. The display will read "CAL1".
Step 9: Press and hold the "SET" key for one sec-
ond. The display will read "HoLd". Wait for the display
to change to "CAL2".
Step 10: Proceed with CAUTION to avoid SHOCK
hazard. Remove and relocate one end of the jumper
cable to the loose end of the second precision resis-
tor for the second resistance value (i.e. 2000 ohms or
200 ohms), as shown.
M-33-01-02 02/17/11
Step 11: Press and hold the "SET" key for one sec-
ond. The display will read "HoLd". Wait for the display
to reset. After it resets, the display should indicate the
approximate temperature value for the connected pre-
cision resistors (i.e. 511ºF or 266ºC).
Step 12: Turn OFF power to the controller and re-
move the precision resistors. Retain for future use.
Reinstall the RTD sensor and rear cover of controller.
Return the calibrated control to service.
Thermocouple
The DE20 can be equipped with an optional thermo-
couple sensor board (Item Number 5417). Installa-
tion requires configuration for the specific thermo-
couple used. The two wire thermocouple is polar-
ized, therefore it is necessary to connect the negative
lead wire of the thermocouple to the #1 terminal, and
the positive lead to the #2 terminal to maintain proper
polarity.
Equipment needed:
A precise, NIST traceable, thermocouple calibrator
with suitable extension leads to match the thermo-
couple type used.
!
WARNING!
Calibration procedures require the removal of the
rear cover of the control. It also requires that power
is ON, exposing the technician to potentially lethal
voltages. Exercise EXTREME CARE and wear tested
electrician's gloves whenever power is on.
M-33-01-02 02/17/11
NEGATIVE (-)
POSITIVE (+)
THERMOCOUPLE
Calibration procedure for a thermocouple:
Step 1: Turn OFF all power.
Step 2: Remove rear cover.
Step 3: Remove T/C sensor.
Step 4: Install the thermocouple calibrator to termi-
nal #1 and #2
Step 5: CAREFULLY restore power to the controller,
making sure that you do not come in contact with any
exposed voltage.
Step 6: Press the decrease " " key and increase
" " buttons simultaneously and hold for approximately
6 seconds. The display will indicate "AC.0". While
the "0" is flashing, use the increase key to change
this to "22". Press the "SET" key. The control display
will read "CAL1".
Step 7: Adjust the thermocouple calibrator to 0.0ºC
(32.0ºF).
Step 8: Press and hold the "SET" key for one sec-
ond. The display will read "HoLd". Wait for the display
to change to "CAL2".
Step 9: Adjust the thermocouple calibrator to 250.0ºC
(482.0ºF).
Step 10: Press and hold the "SET" key for one sec-
ond. The display will read "HoLd". Wait for the display
to reset and display 250.0ºC (482.0ºF).
Step 11: Turn OFF power to the control and remove the
thermocouple calibrator. Reinstall the thermocouple
sensor and the rear cover of the control. Return the
control to service.
Voltage Signal Calibration
The DE20 control measures DC voltage and com-
pares that measurement with a "standard" set of val-
ues in the control memory. To restore, update or
merely verify that this "standard" set of values is cor-
rect, do the following:
-8-
Hide quick links:
Advertisement
Table of Contents
