Alarm DRG-AR-RTD Instruction Sheet

SPECIFICATIONS
Normal Mode (analog filtering):
<250mSec, (10-90%)
Inputs
Setpoints
Sensor Types: Pt100, Pt500,
Effectivity: Setpoints are adjust-
Pt1000 (0.00385Ω/Ω/°C);
able over 100% of the selected
Cu10, Cu100; Ni120, NiFe604
input span
Sensor Connection: 3-wire.
Repeatability (constant temp.):
Input Ranges: see table 1.
±0.2% of full scale
Excitation Current (Maximum)
Stability
<2mA for Pt100, Pt500, Pt1000,
Line Voltage: ±0.01%/%, max.
Ni120, Cu100 or NiFe604
Temperature: ±0.05% of full
<10mA for Cu10, Cu25.
scale/°C, max.
Leadwire Resistance
Common Mode Rejection
40% of base sensor resistance or
DC to 60Hz: 120dB
100Ω (whichever is less), maximum
>60Hz: 100dB
per lead.
Isolation
Leadwire Effect
1800VDC between contacts,
Less than 1% of selected span
input and power
over entire leadwire resistance
EMC Compliance (CE Mark)
range.
Emissions: EN50081-1
Input Protection
Immunity: EN50082-2
Normal Mode: Withstands ±5VDC.
Safety: EN50178
Common Mode(Input to Ground):
Humidity (Non-Condensing)
1800VDC, max.
LED Indicators Operating: 15 to 95% (@45°C)
Soak: 90% for 24 hours (@65°C)
Input Range (Green)
Temperature Range
>110% input: 8Hz flash
Operating: -15 to 55°C
<0% input: 4Hz flash
(5 to 131°F)
Setpoint (Red)
Storage: -25 to 75°C
Tripped: Solid red
(-13 to 158°F)
Safe: Off
Power
Limit Differentials (Deadbands)
Consumption: 1.5W typical,
1.0% to 5% of span
2.5W max.
Response Time
Supply Range: 9 to 30VDC,
Dynamic Deadband: Relay status
inverter isolated
will change when proper
In-rush Current: 300mA, max.
setpoint/process condition
exists for 100msec.
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
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3. Repair instructions and/or specific problems relative to the product
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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
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 Compli-
ance 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 RTD Input (+)
42 RTD Input (-)
43 RTD Return
51 N.O. Relay A
52 Com. Relay A
53 N.C. Relay A
WARRANTY/DISCLAIMER
warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the
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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.
721-0608-00B
DRG-AR-RTD
RTD Input, Field Configurable Limit Alarm
Instruction Sheet M2395/0796
DESCRIPTION
The DRG-AR-RTD is a DIN rail mount,
RTD input limit alarm with dual setpoints
and two contact closure outputs. The
field configurable input and alarm func-
tions offer flexible setpoint capability.
There are up to eight temperature
ranges available for each RTD type to
ensure accuracy and maximize setpoint
resolution.
The DRG-AR-RTD 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 (1.0 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-RTD is equipped with
three front panel LEDs. The first is a
dual function LED labeled INPUT. This
green 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 full scale, the LED will
flash at 8 Hz. Below 0%, the flash rate
is 4 Hz.
purchase price of the
Two red LED's indicate the relay state
for each setpoint. An illuminated red
LED indicates the tripped condition.
OUTPUT
The DRG-AR-RTD 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-RTD limit alarm setpoints can
be configured for HI or LO, failsafe or
7/97
non-failsafe operation. Each of the
CONFIGURATION
setpoints has a respective HI or LO
Unless otherwise specified, the
deadband. In a tripped condition, the
factory presets the Model
setpoint is exceeded and the appro-
DRG-AR-RTD as follows:
priate red LED will illuminate. The trip
will reset only when the process falls
Input: Platinum (100W)
below the HI deadband or rises above
Range: 0 to 250°C
the LO deadband (see Figure 1). For
Output: Dual, SPDT
proper deadband operation, the HI
Trip: A:HI, B:LO
setpoint must always be set above the
Failsafe: No
LO setpoint.
Deadband: A, B: 1.0%
In failsafe operation, the relay is en-
The DC power input accepts any
ergized when the process is below the
DC source between 9 and 30V;
HI setpoint or above the LO setpoint
typically a 12V or 24VDC source is
(opposite for non-failsafe). In the
used.
failsafe mode, a power failure results
in an alarm state output.
For other I/O ranges, refer to
DYNAMIC DEADBAND
Tables 1 through 3 and reconfigure
LSI circuitry in the DRG-AR-RTD pre- switches SW1 and SW2 for the
vents false trips by repeatedly sam- desired input type, range and
pling the input. The input must remain function.
beyond the setpoint for 100 millisec-
onds, uninterrupted, to qualify as a WARNING: Do not attempt to
valid trip condition. Likewise, the change any switch settings with
input must fall outside the deadband power applied. Severe damage will
result!
and remain there for 100 milliseconds
to return the alarm to an untripped
condition. This effectively results in a Input
"dynamic deadband" —based on 1. With DC power off, position input
time— in addition to the normal switches 1 through 6 on "SW2" for
deadband. RTD type (see Table 1).
2. Set position 1 through position 4
Illustrating LO Setpoint
Illustrating HI Setpoint
of input range switch "SW1" for the
Setpoint
100 desired RTD type and input temper-
Relay returns to its
untripped condition
Relay Trips
(LED Off) ature range (Table 3).
(LED Red)
} 10% Deadband
50 3. Set position 5 and 6 of input
} 10% Deadband
range switch "SW1" to ON for a HI
Relay Trips
(LED Red)
Relay returns to its
trip setpoint or OFF for a LO trip
untripped condition
(LED off)
setpoint (Figure 4).
Time
Figure 1: Limit alarm operation and
4. Set position 7 of input range
effect of deadband(s).
switch "SW1" to ON for non-failsafe
operation or OFF for failsafe
operation (e.g. alarm trips upon
power failure).