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Table 3: Input Range switch settings (SW1-1 through 4)
CALIBRATION
1. After configuring the DIP switches,
connect the input to a calibrated RTD
source or a resistance decade box and
apply power. (Figure 6).
NOTE: To maximize thermal stability, final
calibration should be performed in the op-
erating installation, allowing approximately
1 to 2 hours for warm up and thermal
equilibrium of the system.
2. Setpoint: set deadband at its mini-
mum (fully counter clockwise) before
adjusting the setpoint. With the desired
trip RTD resistance input applied, ad-
just setpoint until the relay trips. For HI
trip calibration, start with the setpoint
above the desired trip (full clockwise).
For LO trip calibration, start below the
desired trip (full counter clockwise).
3. Deadband: Set deadband to its
minimum (fully counter clockwise).
Set the setpoint to desired trip. Adjust
RTD resistance input until relay trips.
Readjust deadband to 5% (fully clock-
wise). Set RTD resistance input to
desired deadband position. Slowly
adjust deadband until relay untrips
*Note: Resistance values for Pt 500( Ω ) and Pt 1000( Ω ) are 5 and 10 times the resistance
value of Pt100 ( Ω ), respectively.
Table 1: RTD Input Type switch
settings (SW2 - 1 through 6)
Table 2: Setpoint Function switch
settings (SW1 - 5 through 8)
Note1: All DRG Series modues are designed and tested to operate in ambient temperatures from 0 to 55
mounted on a horizontal DIN rail. When five or more modules are mounted on a vertical rail, circulating air or model
DRG-HS01 Heat Sink is recommended.
RELAY PROTECTION AND
EMI SUPPRESSION
When switching inductive loads,
maximum relay life and transient
EMI suppression is achieved using
external protection (see Figures 2
and 3). Place all protection devices
directly across the load and mini-
mize all lead lengths. For AC induc-
tive loads, place a properly-rated
MOV across the load in parallel with
a series RC snubber. Use a 0.01 to
0.1µF pulse film capacitor (foil
polypropylene recommended) of
sufficient voltage, and a 47Ω,
1/2W carbon resistor.
inductive loads, place a diode across
the load (PRV > DC supply, 1N4006
recommended) with (+) to cathode
and (-) to anode (the RC snubber is
an optional enhancement).
RTD Input (+)
RTD Input (-)
RTD Return
°
C, when
Figure 6: Wiring Diagram for DRG-AR-RTD
ON
1
2
3
4
5
6
7 8
"B" HI Trip
ON
"A" HI Trip
ON
Non-Failsafe
Input Range
See Table 1
"B" LO Trip
OFF
"A" LO Trip
OFF
Failsafe
Figure 4: DRG-AR-RTD Input Range/Function Selection (SW1)
Factory Default Settings
Power
+
-
Load
Relay
Contacts
Diode
(optional)
47 ohm
0.1uF
1/2W
Film
Figure 2: DC Inductive Loads
Power
Load
Relay
Contacts
For DC
MOV
47 ohm
0.1uF
1/2W
Film
Figure 3: AC Inductive Loads
Figure 7: Mechanical Dimensions for DRG-AR-RTD
ON
Not Used
ON
OFF
Not Used
OFF
Figure 5: DRG-AR-RTD Factory Calibration;
0-250°C (Pt 100), A-HI/B-LO, Non-Failsafe
Warning: Do not attempt
to change any switch
settings with power applied.
Severe damage may occur!
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