DESCRIPTION
The DRG-AR-DC is a DIN rail mount,
DC voltage or current input limit alarm
with dual setpoints and two contact
closure outputs. The field configurable
input and alarm functions offer flexible
setpoint capability. Input voltage spans
from 10mV to 200V and input current
spans from 1mA to 100mA can be field
configured. Bipolar inputs are also
accepted.
The DRG-AR-DC is configurable as a
single or dual setpoint alarm, with HI or
LO trips and failsafe or non-failsafe
operation. Also included are adjust-
able deadbands (0.25 to 5% of full
scale input) for each setpoint, a 24VDC
voltage source (isolated from line
power) for transducer excitation, and
a flexible DC power supply which ac-
cepts any voltage between 9 and
30VDC.
DIAGNOSTIC LEDS
The DRG-AR-DC is equipped with
three front panel LEDs. The green
LED is a dual function LED labeled
INPUT. This LED indicates line power
and input signal status. Active DC
power is indicated by an illuminated
LED. If this LED is off, check DC
power and wiring connection. If the
input signal is more than 110% of the
full scale range, the LED will flash at 8
Hz. Below 0%, the flash rate is 4 Hz.
Two red LEDs indicate the relay state
for each setpoint. An illuminated red
LED indicates the tripped condition.
OUTPUT
The DRG-AR-DC is equipped with two
SPDT (form C) relays, rated at 120VAC
or 28VDC at 5 amperes. Each of these
relays is independently controlled by
the field configurable setpoint and
deadband.
OPERATION
The field configurable DRG-AR-DC
limit alarm setpoints can be configured
for HI or LO, failsafe or non-failsafe
operation. Each of the setpoints has
a respective HI or LO deadband. In a
tripped condition, the setpoint is ex-
ceeded and the appropriate red LED
will illuminate. The trip will reset only
when the process falls below the HI
deadband or rises above the low
deadband (see Figure 1). For proper
deadband operation, the HI setpoint
must always be set above the LO
setpoint. In failsafe operation, the
relay is energized when the process is
below the HI setpoint or above the LO
setpoint (opposite for non-failsafe). In
the failsafe mode, a power failure
results in an alarm state output.
DYNAMIC DEADBAND
LSI circuitry in the DRG-AR-DC pre-
vents false trips by repeatedly sam-
pling the input. The input must remain
beyond the setpoint for 100 millisec-
onds, uninterrupted, to qualify as a
valid trip condition. Likewise, the input
must fall outside the deadband and
remain there for 100 milliseconds to
return the alarm to an untripped con-
dition. This effectively results in a
“dynamic deadband” —based on
time— in addition to the normal
deadband.
Figure 1: Limit alarm operation
and effect of deadband(s).
CONFIGURATION
Unless otherwise specified, the
factory presets the Model
DRG-AR-DC as follows:
Input:
Current
Range:
0-20mA
Output:
Dual, SPDT
Trip:
A:HI, B:LO
Failsafe:
No
Deadband: A, B: 0.25%
The DC power input accepts any DC
source between 9 and 30V, typically a
12V or 24VDC source is used.
For other I/O ranges, refer to Table 1
and Figure 4. Reconfigure switche
SW1 for the desired input type, range
and function.
1. With DC power off, set positions 9
and 10 of switch “SW1” for current or
voltage.
2. Set position 1 through position 4 of
input range switch “SW1” for the de-
sired input range (see Table 1).
3. Set position 5 of input range switch
“SW1” to ON for unipolar (e.g. zero
based, 0-20mA) range or OFF for
bipolar (e.g. -100% offset,
-20 to 20mA) range (see Figure 4).
4. Set position 6 and 7 of input
range switch “SW1” to ON for a HI trip
setpoint or OFF for a LO trip setpoint
(see Figure 4).
5. Set position 8 of input range
switch “SW1” to ON for non-failsafe
operation or OFF for failsafe
operation (e.g. alarm trips upon
power failure).
WARNING:
Do not attempt to
change any switch settings with power
applied. Severe damage will result!
50
100
Pr
oc
es
s
(%
o
f
S
pan)
Time
Relay Trips
(LED Red)
Relay Trips
(LED Red)
Relay returns to its
untripped condition
(LED Off)
Relay returns to its
untripped condition
(LED off)
} 10% Deadband
} 10% Deadband
Setpoint
Illustrating HI Setpoint
Illustrating LO Setpoint
DRG-AR-DC
DC Input, Field Configurable Limit Alarm
Instruction Sheet M2399/0796
Inputs
Voltage Input
Range: 10mV to +200V
Impedance: >100K
Ω
Overvoltage: 200V rms, max.
Current Input
Range: 1mA to +100mA
Impedance: 20
Ω
, typical
Overcurrent: 170mA rms, max.
Overvoltage: 60VDC
(protected by self resetting fuse)
Common Mode (Input to Ground):
1800VDC, max.
LED Indicators
Input Range (Green)
>110% input: 8Hz flash
<0% input: 4Hz flash
Setpoint (Red)
Tripped: Solid red
Safe: Off
Limit Differentials (Deadbands)
>50mV/5mA: 0.25% to 5% of span
<50mV/5mA: 1% to 5% of span
Response Time
Dynamic Deadband: Relay status
will change when proper
setpoint/process condition exists
for 100msec.
Normal Mode (analog filtering):
<250mSec, (10-90%)
Setpoints
Effectivity: Setpoints are adjustable
over 100% of the selected input
span.
Repeatability (constant temp.):
>50mV/5mA: 0.1% of full scale
<50mV/5mA: 0.2% of full scale
Stability
Temperature: +0.05% of full
scale/°C, max.
Excitation Voltage
24VDC, 20mA, maximum
Common Mode Rejection
DC to 60Hz: 120dB
Isolation
1800VDC between contacts, input
and power
EMC Compliance (CE Mark)
Emmissions: EN50081-1
Immunity: EN50082-2
Safety: EN50178
Humidity (Non-Condensing)
Operating: 15 to 95% (@45°C)
Soak: 90% for 24hours (@65°C)
Temperature Range
1
Operating: 0 to 55°C (32 to 131°F)
Storage: -25 to 70°C (-13 to 158°F)
Power
Consumption: 1.5W typical,
2.5W max.
Supply Range: 9 to 30VDC,
inverter isolated
In-rush Current: 300mA, max.
Relay Contacts
2 SPDT (2 form C) Relays
1 Relay per setpoint
Current Rating (resistive)
120VAC: 5A
240VAC: 2A
28VDC: 5A
Material: Silver-Cadmium Oxide
Electrical Life:10
5
operations
at rated load
Note: External relay contact
protection is required for use
with inductive loads (see
Figures 2 & 3).
Mechanical Life: 10
7
operations
Wire Terminations
Screw terminations for 12-22 AWG
Agency Approvals
CSA certified per standard C22.2, No.
0-M91 and 142-M198 (File
No.LR42272) UL recognized per stan-
dard per standard UL508 (File
No.E99775). CE conformance per
EMC directive 89/336/EEC and Low
Voltage 73/23/EEC (Input<75VDC,
only).
Mounting
32mm and 35mm DIN Rail
PIN CONNECTIONS
11
N.O. Relay B
12
Com. Relay B
13
N.C. Relay B
21
DC Power (+)
22
DC Power (-)
23
No Connection
41
Analog Input (+)
42
Analog Input (-)
43
(+) 24VDC Excitation
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WARRANTY/DISCLAIMER
RETURN REQUEST/ INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER
MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA'S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING
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1.
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2.
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3.
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OMEGA ENGINEERING, INC. warrants this unit to be free of manufacturing defects for the life of the product.
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ã Copyright 1996 OMEGA ENGINEERING, INC. All rights reserved. This documentation may not be copied, photocopied, reproduced, translated, or reduced to any
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721−0607−00Β 11/97
