Omega Products DRG-AR-TC Installation Manual

50

100

Process (% of Span)

Time

Relay Trips

(LED Red)

Relay Trips

(LED Red)

Relay returns t o its

untripped condition

(LED Off)

Relay returns t o its

untripped condition

(LED off)

} 10% Deadband

} 10% Deadband

Setpoint

Illustrating HI Setpoint

Illustrating LO Setpoint

USA:

ISO 9001 Certified

Canada:

USA and Canada:

Mexico and
Latin America:

Benelux:

Czech Republic:

France:

Germany/Austria:

United Kingdom:

ISO 9002 Certified

SPECIFICATIONS

Inputs

Range: See Table 1
Impedance: >1 Megaohm
Input Bias Current (burnout

detection): <1.5 microamp
Overvoltage: ±10V differential
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)

0.25% 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%)

Setpoint

Effectivity: Setpoint(s) are adjustable

over 100% of the selected input
span
Repeatability (constant temp.):

0.2% for temp > 0°C

0.3% for temp < 0°C

OMEGAnetSM On-Line Service

http://www.omega.com

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Telephone: [phone]
e-mail:[e-mail]

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LE9 6TU, England
Tel: [phone]
Fax: [phone]

Servicing North America:

For immediate technical sevice or application assistance:

Servicing Europe:

Toll Free in England: 0800-488-488

e-mail: [e-mail]

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P.O. Box 7, Omega Drive
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M44 5EX, England
Tel: [phone]
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Stability

Temperature: ±0.05% of full

scale/°C, max.

Common Mode Rejection

DC to 60Hz: 120dB

Isolation

1800VDC between contacts,
input and power

EMC Compliance (CE Mark)

Emissions: EN50081-1
Immunity: EN50082-2
Safety: EN50178

Humidity (Non-Condensing)

Operating: 15 to 95% (@45°C)
Soak: 90% for 24 hours (@65°C)

Temperature Range

Operating: 0 to 55°C (32 to 131°F)
Storage: -15 to 70°C (5 to 158°F)

Power

Consumption: 1.5W typical,

2.5W max.

Supply Range: 9 to 30 VDC,

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

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 for any omissions or errors nor assumes liability for any
damages that result from the use of its products in accordance with information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by
it will be as specified and free of defects. OMEGA MAKES NO OTHER W ARRANTIES OR REPRESENT A TIONS OF ANY KIND WHA TSOEVER, EXPRESSED OR IMPLIED,
EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCL UDING ANY W ARRANTY OF MERCHANT ABILITY AND FITNESS FOR A P ARTICULAR PURPOSE
ARE HEREBY DISCLAIMED. LIMITA TION OF LIABILITY : The remedies of purchaser set forth herein are exclusive and the total liability of OMEGA with respect to this order ,
whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the purchase price of the component upon which liability is based. In no
event shall OMEGA be liable for consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a "Basic Component" under 10 CFR 21 (NRC), used in or with any nuclear
installation or activity; or (2) in medical applications or used on humans. Should any Product(s) be used in or with any nuclear installation or activity, medical application,

SM

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
MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA'S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING
DELAYS). The assigned AR number should then be marked on the outside of the return package and on any correspondence.
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.

Material: Silver-Cadmium Oxide
Electrical Life: 10

rated load

Note: External relay contact
protection is required for use
with inductive loads (see relay
protection Figures 2 & 3).

Mechanical Life: 107 operations

Wire Termination

Screw terminations for 12-22 AWG

Agency Approvals

CSA certified per standard C22.2,

No. 0-M91 and 142-M1987 (File

No. LR42272) UL recognized per
standard UL508 (File No.E99775)
CE Conformance per EMC directive
89/336/EEC and Low Voltage 73/23/
EEC

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 T/C Input (+)
42 T/C Input (-)
43 No Connection
51 N.O. Relay A
52 Com. Relay A
53 N.C. Relay A

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.

5

operations at

721-0609-00A 8/96

DRG-AR-TC
Field Configurable Limit Alarm

Instruction Sheet M2398/0796

DESCRIPTION

The DRG-AR-TC is a DIN rail mount,
thermocouple input limit alarm with
dual setpoints and two contact closure
outputs. The field configurable input
and alarm functions offer flexible
setpoint capability. There are up to six
temperature ranges available for each
thermocouple type to ensure accura­cy and maximize setpoint resolution.
A bipolar input switch is provided for
temperature ranges below 0°C.

The DRG-AR-TC is configurable as a
single or dual setpoint alarm, with HI or
LO trips, upscale or downscale ther­mocouple burnout detection and
failsafe or non-failsafe operation. Also
included are adjustable deadbands
(0.25 to 5% of full scale input) for each
setpoint and a flexible DC power sup­ply which accepts any voltage be­tween 9 and 30VDC.

DIAGNOSTIC LEDS

The DRG-AR-TC is equipped with
three front panel LEDs. The first is a
dual function LED labeled INPUT.
This green LED indicates DC power
and input signal status. Active DC
power is indicated by an illuminated
LED. If this LED is off, check line
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 LED’s indicate the relay state
for each setpoint. An illuminated red
LED indicates the tripped condition.

OUTPUT

The DRG-AR-TC 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 set
point and deadband.

OPERATION

The field configurable DRG-AR-TC
limit alarm setpoints can be config­ured for HI or LO, failsafe or non­failsafe 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-TC 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 Model DRG-AR-TC as
follows:

Input: J Type
Range: 0 to 350°C
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 reconfigure switches SW1
and SW2 for the desired input type,
range and function.

WARNING:

switch settings with power applied. Severe
damage will result!

1. With DC power off, position switch
SW1-1, 2, 3 and SW2­1 through 6 for the desired input range
(Table 1).

2. Set positions 4 and 5 of function
switch “SW1” to ON for a HI trip
setpoint or OFF for a LO trip setpoint
(Figure 4).

3. Set position 6 of function switch
“SW1” to ON for non-failsafe opera­tion or OFF for failsafe operation (e.g.
alarm trips upon power failure).

4. Set positions 7 and 8 of function
switch "SW1" to upscale or downscale
burn-out.

Do not attempt to change any

CALIBRATION

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 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 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

.

Table 1: DRG-AR-TC Input Range Selector -Switch Settings

KEY: = ON

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

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

Power

+

-

Relay

Contacts

(optional)

Figure 2: DC Inductive Loads

Figure 4: Input Range/Function Selection (SW1)

Factory Default Settings

Load

Diode

47 ohm

1/2W

0.1uF
Film

and (-) to anode (the RC snubber is an
optional enhancement).

Power

Relay

Contacts

Figure 3: AC Inductive Loads

Load

47 ohm

1/2W

MOV

0.1uF
Film

DIMENSIONS

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

Figure 6: Wiring Diagram for DRG-AR-TC