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AC Powered DC Input DIN Rail Limit Alarm
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Field Configurable Input Ranges
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Touch CalibrationTechnology
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Setpoints Programmable HI or LO and Failsafe or Non-Failsafe
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Provides Relay Contact Closures at a Preset DC Input Level
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Universal AC Power 85 to 265 Vac
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24 Vdc Transducer Excitation
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ASIC Technology for Enhanced Reliability
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DIN Rail Mounting
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View related products - Process Measurement and Control Instruments
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The DRI-DC-LA 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 10 mV to 200 V and input
current spans from 1 mA to 100 mA can be field
configured. Bipolar inputs are also accepted.
The DRI-DC-LA 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 (up to 100% of full scale input) for each
setpoint, a 24 Vdc voltage source (isolated from line
power) for transducer excitation, and a universal AC
power supply which accepts any voltage between
85 and 265 Vac.
The DRI-DC-LA has simplified setpoint calibration.
Using a pushbutton instead of potentiometers,
improvements in calibration resolution and reliability are
realized due to the elimination of the potentiometers’
mechanical variability.
For calibration, simply input the signal level of the
desired trip and press the pushbutton to store it in
non-volatile memory. Deadband is entered the same
way with another pushbutton press to store.
The DRI-DC-LA is equipped with three front panel
LEDs. The green LED is a dual function LED labeled
IN, which indicates line power and input signal status.
Active AC power is indicated by the illuminated LED. If
this LED is off, check AC power and wiring connections.
If the input signal is 7% above or below the configured
input range the green LED will flash at 8 Hz or 4 Hz,
respectively.
The two red LEDs indicate the relay state of each
setpoint. An illuminated red LED indicates the tripped
condition for the respective setpoint.
The DRI-DC-LA is equipped with two SPDT (form
C) relays, rated at 120 Vac or 28 Vdc at 5 A. Each of
these relays is independently controlled by the field
configurable setpoint and deadband.
The DRI-DC-LA 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 after the process falls below
the HI deadband or rises above the low deadband.
For proper deadband operation, the HI setpoint must
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 nonfailsafe). In the failsafe mode, a power failure
results in an alarm state output.
Circuitry in the DRI-DC-LA prevents false trips
by repeatedly sampling the input. The input must
be 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 results in a “dynamic
deadband” —based on time— in addition to the normal
deadband.
Unless otherwise specified, the factory presets the DRI-DC-LA as follows:
Input: Current
Range: 0 to 20 mA
Output: Dual, SPDT
Trip:
A: HI, B: LO
Failsafe: No
Deadband: (A, B): 0.25%
When switching inductive loads, maximum relay life and
transient EMI suppression is achieved by using external
protection. Place all protection devices directly across
the load and minimize 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 0.1 mF
pulse film capacitor (foil polypropylene recommended)
of sufficient voltage, and a 47 Ω, ˝ W 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).
Specifications
Voltage Input (Unipolar or Bipolar):
Range: 10 mV, 20 mV, 50 mV, 100 mV, 200 mV,
500 mV, 1V, 2V, 5V, 10V, 20V, 50V, 100V, 200V (dip-switch selectable)
Impedance: >100 kΩ
Overvoltage: 200 Vrms max
Current Input (Unipolar or Bipolar):
Range: 1 mA, 2 mA, 5 mA, 10 mA, 20 mA, 50 mA,
100 mA (dip-switch selectable)
Impedance: 20 Ω typical
Overcurrent: 170 mA rms max
Overvoltage: 60 Vdc (self-resetting fuse)
Common Mode (Input to Gnd): 1800 Vdc max
LED Indicators:
Input (Green): >110% input: 8 Hz flash; <10% input: 4 Hz flash
Setpoint (Red):
Tripped: Solid red
Safe: Off
Limit Differential (Deadband):
>50 mV/5 mA: 0.25 to 100% of span
<50 mV/5 mA: 1 to 100% of span
Response Time:
Dynamic Deadband: Relay status will change when
proper setpoint/process condition exists for 100 msec
Normal Mode (Analog Filtering): <250 msec (10 to 90%)
Setpoints:
Effectivity: Setpoints are adjustable over 100% of the
selected input span
Repeatability (Constant Temp): >50 mV/5 mA: 0.1% of
full scale; <50 mV/5 mA: 0.2% of full scale
Temperature Stability: +0.05% of full scale/°C max
Excitation Voltage: 24 Vdc, 20 mA max
Common Mode Rejection: DC to 60 Hz: 120 dB
Isolation: 1800 Vdc between contacts, input and power
ESD and Transient Susceptibility: Meets IEC 801-2, Level 3 (8 KV)
Humidity (Non-Condensing):
Operating: 15 to 95% RH @ 45°C (113°F)
Soak: 90% RH for 24 hours @ 65°C (149°F)
Temperature Range:
Operating: 0 to 55°C (32 to 131°F)
Storage: -25 to 70°C (-13 to 158°F)
Power: 100 to 240 Vac ±10%, 50 to 400 Hz; 2.5 W max
Relay Contacts: 2 SPDT (2 form C) relays (1 relay per setpoint)
Current Rating (Resistive): 120 Vac, 5A; 240 Vac, 2A; 28 Vdc, 5A
Material: Gold flash over silver alloy
Electrical Life: 105 operations at rated load (external relay contact protection is required for use with inductive loads)
Mechanical Life: 107 operations
Wire Terminations: Screw terminations for 12 to 22 AWG
Weight: 254 g (0.56 lb)
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† All dollar amounts on this site are shown in Singapore currency.
Note: An ACPB power rail is required to power the modules and is ordered separately.
Ordering Example: (1) ACPB-2 AC power distribution bus for 2 modules, $96.00,
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