Omega Products DRG-AR-DC Installation Manual

50

100

Process (% of Span)

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

Inputs

Voltage Input

Range: 10mV to +200V
Impedance: >100KΩ
Overvoltage: 200V rms, max.

Current Input

Range: 1mA to +100mA
Impedance: 20Ω, 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.):

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>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: 107 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 stan­dard 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

OMEGA ENGINEERING, INC. warrants this unit to be free of manufacturing defects for the life of the product.
If the unit should malfunction, it must be returned to the factory for evaluation. OMEGA's Customer Service Department will issue an Authorized Return
(AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective it will be repaired or replaced at
no charge. OMEGA's WARRANTY does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper
interfacing, operation outside of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having
been tampered with or shows evidence of being damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specifica­tion; misapplication; misuse or other operating conditions outside of OMEGA's control. Components which wear are not warranted, including but not
limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA neither assumes responsibility
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installation or activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic WAR­RANTY/DISCLAIMER language, and additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever
arising out of the use of the Product(s) in such a manner.

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER
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The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.

FOR WARRANTY RETURNS, please have the following information
available BEFORE contacting OMEGA:

1. P.O. number under which the product was PURCHASED,

2. Model and serial number of the product under warranty, and

3. Repair instructions and/or specific problems relative to the product

OMEGA's policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in technology and
engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
ã Copyright 1996 OMEGA ENGINEERING, INC. All rights reserved. This documentation may not be copied, photocopied, reproduced, translated, or reduced to any
electronic medium or machine-readable form, in whole or in part, without prior written consent of OMEGA ENGINEERING, INC.

It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to the European
New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.
The information contained in this document is believed to be correct but OMEGA Engineering, Inc. accepts no liability for any errors it contains, and reserves the right to alter
specifications without notice.
WARNING: These product are not designed for use in, and should not be used for, patient connected applications.

WARRANTY/DISCLAIMER

RETURN REQUEST/ INQUIRIES

FOR NON-WARRANTY REPAIRS, consult OMEGA for current repair
charges. Have the following information available BEFORE contacting OMEGA:

1. P.O. number to cover the COST of the repair,

2. Model and serial number of product, and

3. Repair instructions and/or specific problems relative to the product.

721−0607−00Β 11/97

DRG-AR-DC
DC Input, Field Configurable Limit Alarm

Instruction Sheet M2399/0796

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 adjust­able 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 ac­cepts 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 ex­ceeded 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.

Figure 1: Limit alarm operation
and effect of deadband(s).

DYNAMIC DEADBAND

LSI circuitry in the DRG-AR-DC pre­vents false trips by repeatedly sam­pling the input. The input must remain
beyond the setpoint for 100 millisec­onds, 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 con­dition. This effectively results in a
“dynamic deadband” —based on
time— in addition to the normal
deadband.

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: N o
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.

WARNING:

change any switch settings with power
applied. Severe damage will result!

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 de­sired 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).

Do not attempt to

SPECIFICATIONS

Note1: All DRG Series modues are designed and tested to operate in ambient temperatures from 0 to
55°C, when 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.

Figure 4: DRG-AR-DC Input Range/Function

Selection (SW1) Factory Default Settings

CALIBRATION

1. After configuring the DIP switches,
connect the input to a calibrated DC
source and apply power. Refer to the
terminal wiring (Figure 7).

Note: To maximize thermal stability, final
calibration should be performed in the op­erating installation, allowing approximately
1 to 2 hours for warm up and thermal
equilibrium of the system.

2. Setpoint: set deadband at its mini­mum (fully counter clockwise) before
adjusting the setpoint. With the de­sired trip voltage or current 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
voltage/current input until relay trips.
Readjust deadband to 5% (fully clock­wise). Set voltage/current input signal
to desired deadband position. Slowly
adjust deadband until relay untrips.

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 minimize
all lead lengths. For AC inductive
loads, place a properly-rated MOV
across the load in parallel with a
series RC snubber. Use a 0.01 to

Table 1: DRG-AR-DC Input Range

switch settings (SW1 through 4)

KEY = ON

0.1µF pulse film capacitor (foil polypro­pylene recommended) of sufficient
voltage, and a 47Ω, 1/2W carbon
resistor. For DC 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).

Power

+

-

Relay

Contacts

(optional)

Figure 2: DC Inductive Loads

Relay

Contacts

Load

47 ohm

1/2W

Load

47 ohm

1/2W

Diode

MOV

0.1uF
Film

0.1uF
Film

Power

Figure 5: DRG-AR-DC Factory Calibration;

0-20mA, A-HI/B-LO, Non-Failsafe

Warning: Do not attempt to
change any switch settings
with power applied. Severe
damage may occur!

Figure 6: Typical connections of voltage or
current inputs for DRG-AR-DC

DIMENSIONS

Figure 3: AC Inductive Loads

Figure 7: Terminal Wiring Diagram for DRG-AR-DC

Figure 8: Mechanical Dimensions for DRG-AR-DC