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CALIBRATION
Table 1: DRG-AR-TC Input Range Selector -Switch Settings
1. After configuring the DIP switches,
connect the input to a calibrated TC
source and apply power. Refer to the
terminal wiring (Figure 5).
NOTE: to maximize thermal stability, final
calibration should be performed in the
operation installation, allowing approxi-
mately 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 de-
sired trip thermocouple millivolt input
applied, adjust 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
thermocouple millivolt input until relay
trips. Readjust deadband to 5% (fully
clockwise). Set voltage/current input
to desired deadband position. Slowly
adjust deadband until relay untrips
DIMENSIONS
KEY:
= ON
RELAY PROTECTION AND
inductive loads, place a diode across
the load (PRV > DC supply, 1N4006
EMI SUPPRESSION
recommended) with (+) to cathode
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-
Relay
Contacts
tive loads, place a properly-rated
MOV across the load in parallel with
a series RC snubber. Use a 0.01 to
0.1 F pulse film capacitor (foil
(optional)
polypropylene recommended) of
sufficient voltage, and a 47 ,
Figure 2: DC Inductive Loads
1/2W carbon resistor.
For DC
Figure 4: Input Range/Function Selection (SW1)
Factory Default Settings
WARNING: Do not attempt to
change any switch settings
with power applied. Severe
damage may occur!
Figure 5: DRG-AR-TC Factory Calibration: J-Type,
0 to 350°C, A-HI/B-LO, non-failsafe
and (-) to anode (the RC snubber is an
optional enhancement).
Power
Power
+
-
Load
Load
Relay
Contacts
MOV
Diode
47 ohm
0.1uF
47 ohm
0.1uF
1/2W
Film
1/2W
Film
Figure 3: AC Inductive Loads
Figure 6: Wiring Diagram for DRG-AR-TC
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