The 2 wire, 1000 ohm RTD sensor must be connected
across terminals #1 AND #2 of the terminal block.
Calibration Procedure for the 2 Wire RTD:
RTD devices are precision 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 (tol/- 0.1%
or better) with a fixed value equal to the
nominal value of the RTD (i.e. 1000 ohms).
2.
A suitable jumper cable to facilitate
changing input resistance.
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.
Step 1:
Turn
OFF
all power.
Step 2:
Remove rear cover.
Step 3:
Remove RTD sensor.
Step 4:
Install the precision resistors in place of the
RTD sensor, as shown.
-6-
2 Wire RTD Sensor Calibration
Step 5:
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), as shown.
Step 6:
Carefully restore power to the control, taking
precautions not to make contact with any exposed
voltage sources.
Step 7:
Press the decrease “
È
” key and increase
“
Ç
” 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 8:
Press and hold the “
SET
” key for 1 second.
The display will read “
HoLd
”. Wait for the display to
change to “
CAL2
”.
Step 9:
Proceed with caution to avoid SHOCK haz-
ard. Remove and relocate one end of the jumper cable
to the loose end of the second precision resistor for
the second resistance value (i.e. 2000 ohms), as
shown.
Step 10:
Press and hold the “
SET
” key for 1 second.
The display will read “
HoLd
”. WAIT for the display to
reset. After resetting, the display should indicate the
approximate temperature value for the connected pre-
cision resistors (i.e. 511ºF or 266ºC).
Step 11:
Turn OFF power and remove the precision
resistors. Reinstall the RTD sensor and the rear cover
of the controller. Return the calibrated control to service.
M-33-01-02 02/17/11
Make sure that the DIP switch settings are OFF, ON,
OFF (see page 13). The voltage signal must be con-
nected across terminals #1 and #2 of the Adder Board
(Item Number 5415). Terminal #1 is common (nega-
tive), and terminal #2 is the signal connection (positive).
Note: Polarity must be observed.
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 voltage signal:
Step 1:
Turn
OFF
all power.
Step 2:
Remove rear cover.
Step 3:
Remove sensor.
Step 4:
Install the voltage calibrator to terminal #1
and #2.
Step 5:
CAREFULLY restore power to the controller,
ensuring that you do not come in contact with any
exposed voltage.
Step 6:
Press the decrease “
È
” key and increase
“
Ç
” 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 power supply to 1.0 volts.
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 power supply to 10.0 volts.
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 10.0.
Step 11:
Turn OFF power to the control and remove
the power supply. Reinstall the voltage input and
the rear cover of the control. Return the calibrated
control to service.
The DE20 control measures the DC current 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:
Check that the DIP switches are set to OFF, OFF, ON
(see page 13).
-9-
Current Input Calibration
Equipment needed:
1.
A precision, NIST traceable, 0-20 mA DC
current calibrator, OR
2.
A precision, NIST traceable, digital
ammeter or DMM and:
a.
a regulated linear DC power
supply with an adjustable
0-10 volt or better output, and
b.
a 400 ohm, 0.1% or better tolerance,
precision resistor.
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 a current input:
Step 1:
Turn
OFF
all power.
Step 2:
Remove rear cover.
Step 3:
Remove input leads.
Step 4:
Install the 0-20 mA DC calibrator or the power
supply, resistor and ammeter in series with terminal
#1 and #2.
Step 5:
CAREFULLY restore power to the controller,
ensuring that you do not come in contact with any
exposed voltage.
Step 6:
Press the decrease “
È
” key and increase
“
Ç
” 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 calibrator or power supply to 5.0
mA.
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 power supply to 20.0 mA.
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 20.0.
Step 11:
Turn OFF power to the control and remove
the power supply. Reinstall the voltage input and the
rear cover of the control. Return the calibrated control
to service.
M-33-01-02 02/17/11
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