Omega DRG-AR-TC User manual

DESCRIPTION
TheDRG-AR-TCisaDINrailmount,
thermocouple input limit alarm with
dualsetpointsandtwocontactclosure
outputs. Thefield configurableinput
and alarm functions offer flexible
setpointcapability. Thereareuptosix
temperaturerangesavailableforeach
thermocoupletypetoensureaccura-
cyand maximize setpointresolution.
A bipolar input switch is provided for
temperaturerangesbelow0°C.
TheDRG-AR-TCisconfigurableasa
singleordualsetpointalarm,withHIor
LO trips, upscale or downscale ther-
mocouple burnout detection and
failsafeornon-failsafeoperation. Also
included are adjustable deadbands
(0.25to5%offullscaleinput)foreach
setpointandaflexibleDCpowersup-
ply which accepts any voltage be-
tween 9 and 30VDC.
DIAGNOSTICLEDS
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
inputsignalismorethan110%ofthe
fullscalerange,theLEDwillflashat8
Hz. Below0%, theflash rate is4 Hz.
TworedLED’sindicatetherelaystate
foreach setpoint. Anilluminated red
LED indicates the tripped condition.
OUTPUT
TheDRG-AR-TCisequippedwithtwo
SPDT (form C) relays, rated at
120VAC or 28VDC at 5 amperes.
Eachoftheserelaysisindependently
controlledbythefieldconfigurableset
pointanddeadband.
OPERATION
The field configurable DRG-AR-TC
limit alarm setpoints can be config-
ured for HI or LO, failsafe or non-
failsafe operation. Each of the
setpoints has a respective HI or LO
deadband. Inatrippedcondition,the
setpoint is exceeded and the appro-
priateredLEDwillilluminate. Thetrip
willreset only when the process falls
belowtheHIdeadbandorrisesabove
thelowdeadband(seeFigure1). For
proper deadband operation, the HI
setpointmustalwaysbesetabovethe
LOsetpoint.
In failsafe operation, the relay is en-
ergizedwhentheprocessisbelowthe
HI setpoint or above the LO setpoint
(opposite for non-failsafe). In the
failsafemode, a power failure results
inan alarmstate output.
DYNAMICDEADBAND
LSI circuitry in the DRG-AR-TC pre-
vents false trips by repeatedly sam-
plingtheinput. Theinputmustremain
beyond the setpoint for 100 millisec-
onds, uninterrupted, to qualify as a
validtripcondition. Likewise,theinput
must fall outside the deadband and
remain there for 100 milliseconds to
returnthe alarm toan untripped con-
dition. This effectively results in a
“dynamic deadband” —based on
time— in addition to the normal
deadband.
Figure1: Limit alarmoperationand
effectofdeadband(s).
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
CONFIGURATION
Unlessotherwisespecified,the
factorypresetsModelDRG-AR-TCas
follows:
Input: J Type
Range: 0 to 350°C
Output: Dual,SPDT
Trip: A: HI, B: LO
Failsafe: No
Deadband: A, B: 0.25%
TheDC powerinput accepts anyDC
source between 9 and 30V, typically
a 12V or 24VDC source is used.
For other I/O ranges, refer to
Table1andreconfigureswitchesSW1
and SW2 for the desired input type,
range and function.
WARNING: Donotattempttochangeany
switchsettingswithpowerapplied.Severe
damagewillresult!
1.WithDCpoweroff,position switch
SW1-1, 2, 3 and SW2-
1through6forthedesiredinputrange
(Table1).
2. Set positions 4 and 5 of function
switch “SW1” to ON for a HI trip
setpointor OFFfor a LOtrip setpoint
(Figure 4).
3. Set position 6 of function switch
“SW1” to ON for non-failsafe opera-
tionorOFFforfailsafeoperation(e.g.
alarm trips upon power failure).
4. Set positions 7 and 8 of function
switch"SW1"toupscaleordownscale
burn-out.
DRG-AR-TC
Field Configurable Limit Alarm
Instruction Sheet M2398/0796
SPECIFICATIONS
Inputs
Range:See Table1
Impedance:>1Megaohm
InputBiasCurrent(burnout
detection):<1.5 microamp
Overvoltage:±10Vdifferential
CommonMode(InputtoGround):
1800VDC,max.
LEDIndicators
InputRange (Green)
>110%input: 8Hzflash
<0%input: 4Hz flash
Setpoint (Red):
Tripped:Solidred
Safe:off
LimitDifferentials (Deadbands)
0.25% to 5% of span
Response Time
DynamicDeadband:
Relaystatuswillchangewhen
propersetpoint/processcondition
exists for 100msec
NormalMode(analogfiltering):
<250msec,(10-90%)
Setpoint
Effectivity:Setpoint(s)areadjustable
over100% of theselectedinput
span
Repeatability(constanttemp.):
0.2% for temp > 0°C
0.3% for temp < 0°C
Stability
Temperature:±0.05%offull
scale/°C, max.
Common Mode Rejection
DCto 60Hz: 120dB
Isolation
1800VDCbetweencontacts,
inputandpower
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 to158°F)
Power
Consumption: 1.5W typical,
2.5W max.
Supply Range: 9 to 30 VDC,
inverterisolated
In-rushCurrent:300mA,max.
RelayContacts
2 SPDT (2 Form C) Relays
1Relay persetpoint
Current Rating (resistive)
120VAC:5A
240VAC:2A
28VDC:5A
Material:Silver-CadmiumOxide
ElectricalLife: 105operations at
ratedload
Note:External relay contact
protectionisrequiredforuse
withinductive loads(seerelay
protectionFigures 2 & 3).
MechanicalLife:107operations
WireTermination
Screwterminationsfor12-22 AWG
AgencyApprovals
CSAcertifiedperstandardC22.2,
No.0-M91and142-M1987(File
No.LR42272) UL recognizedper
standardUL508(FileNo.E99775)
CEConformance per EMC directive
89/336/EECandLowVoltage73/23/
EEC
Mounting
32mm and 35mm DIN Rail
PIN CONNECTIONS
11 N.O.RelayB
12 Com. Relay B
13 N.C.RelayB
21 DC Power (+)
22 DC Power (-)
23 NoConnection
41 T/CInput(+)
42 T/CInput (-)
43 NoConnection
51 N.O.RelayA
52 Com.RelayA
53 N.C.RelayA
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721-0609-00A 8/96

and (-) to anode (the RC snubber is an
optionalenhancement).
inductiveloads,placea diode across
the load (PRV > DC supply, 1N4006
recommended) with (+) to cathode
RELAYPROTECTION AND
EMISUPPRESSION
When switching inductive loads,
maximum relay life and transient
EMIsuppressionisachievedusing
external protection (see Figures 2
and3). Placeallprotectiondevices
directly across the load and mini-
mizeallleadlengths. ForACinduc-
tive loads, place a properly-rated
MOVacrosstheloadinparallelwith
aseriesRCsnubber. Usea0.01to
0.1µF pulse film capacitor (foil
polypropylene recommended) of
sufficient voltage, and a 47Ω,
1/2W carbon resistor. For DC
Load
Diode
(optional)
Power
0.1uF
Film
Figure 2: DC Inductive Loads
47 ohm
1/2W
Relay
Contacts
+-
Load
Power
MOV
0.1uF
Film
Figure 3: AC Inductive Loads
47 ohm
1/2W
Relay
Contacts
Figure4:InputRange/Function Selection(SW1)
FactoryDefault Settings
WARNING:Donotattemptto
changeany switch settings
withpower applied. Severe
damage may occur!
Figure 5: DRG-AR-TC Factory Calibration: J-Type,
0 to 350°C, A-HI/B-LO, non-failsafe
CALIBRATION
1.AfterconfiguringtheDIPswitches,
connect the input to a calibrated TC
sourceandapplypower. Refertothe
terminal wiring (Figure 5).
NOTE:tomaximizethermalstability,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 atits mini-
mum(fullycounterclockwise)before
adjusting the setpoint. With the de-
siredtripthermocouplemillivoltinput
applied,adjustsetpointuntiltherelay
trips. ForHItripcalibration,startwith
thesetpointabovethedesiredtrip(full
clockwise). For LO trip calibration,
startbelowthedesiredtrip(fullcounter
clockwise).
3. Deadband: Set deadband to its
minimum (fully counter clockwise).
Setthesetpointtodesiredtrip. Adjust
thermocouplemillivoltinputuntilrelay
trips. Readjustdeadbandto5%(fully
clockwise). Setvoltage/currentinput
todesireddeadbandposition. Slowly
adjustdeadbanduntil relay untrips
Table1:DRG-AR-TCInputRange Selector -Switch Settings
KEY: = ON
DIMENSIONS
Figure 6: Wiring Diagram for DRG-AR-TC