ES-0430 Rev.4
18KDYH2
Rack-mounted DCS Signal Conditioners 18K-RACK
CURRENT LOOP SUPPLY
(applicable to HART signal, opencircuit detection selectable)
Functions & Features
• Powers a 4 – 20 mA DC current loop
• Isolates and relays HART signals
• Shortcircuit protection
• Opencircuit detection selectable
• Module can be retracted without removing wiring for an insulation test
Typical Applications
• 2-wire HART transmitters
MODEL: 18KDYH2–A[1]–R[2]
ORDERING INFORMATION
• Code number: 18KDYH2-A[1]-R[2]
Specify a code from below for each of [1] and [2].
(e.g. 18KDYH2-A6A-R/B/RE)
INPUT
Current
A
: 4 - 20 mA DC (Input resistance approx. 250Ω)
[1] OUTPUT 1 / OUTPUT 2
6A
: 1 – 5 V DC (Load resistance 2000 Ω min.)
/ 4 – 20 mA DC (Applicable to HART signal, load resistance 600 Ω max.)*
A6
: 4 – 20 mA DC (Applicable to HART signal, load resistance 600 Ω max.)*
/ 1 – 5 V DC (Load resistance 2000 Ω min.)
AA
: 4 – 20 mA DC (Applicable to HART signal, load resistance 600 Ω max.)*
/ 4 – 20 mA DC (Load resistance 500 Ω max.)
* 250 Ω ±10% for HART communication
POWER INPUT
DC Power
R
: 24 V DC
(Operational voltage range 24 V ±10 %, ripple 10 %p-p max.)
[2] OPTIONS (multiple selections)
Opencircuit detection
blank
: none
/B
: Opencircuit detector (Only for HART signal)
Connector output polarity reversal
blank
: none
/RE
: Connector output polarity reversal (Only for HART signal)
GENERAL SPECIFICATIONS
Construction
: Rack-mounted; terminal access via screw terminals on the front and connector on the rear; terminal cover provided
Connection
Input
: M3.5 screw terminals (torque 0.8 N·m)
and connector
Output 1
: Connector
Output 2
: M3.5 screw terminals (torque 0.8 N·m)
and connector
Power input
: Supplied from connector
Screw terminal
: Nickel-plated steel
Isolation
: Input to output 1 to output 2 to power
Overrange output
: Approx. -10 to +110 %
Zero adjustment
: -5 to +5 % (front)
Span adjustment
: 95 to 105 % (front)
Open-circuit detection
: This function enables the input device to detect open circuit of output circuit isolated from the input circuit.
Input current 0 mA when the output loop is open.
Photo MOSFET Relay ON Resistance; 3 Ω max.
SUPPLY OUTPUT
(across the terminals 1 – 2)
Output voltage
: 24 – 28 V DC with no load
18 V DC at 20 mA
Current rating
: ≤ 22 mA DC
• Shortcircuit Protection
Current limited
: 30 mA max.
Protected time duration
: No limit
INPUT SPECIFICATIONS
■
DC Current
: Input resistor incorporated
Input current
: ≥ 0 mA
OUTPUT SPECIFICATIONS
The output goes below 0 % when the input is open.
Polarity of connector output is reversed with option code /RE (with connector output polarity reversal).
HART COMMUNICATION
Transmission gain
: Approx. -3 dB (within 1 – 3 kHz)
measured with 250 Ω at output
Loop impedance
: 250 Ω ±10 %
Communication directions
: Bidirectional
INSTALLATION
Current consumption
:
Output
Code 6A, A6
: Approx. 120 mA
Output
Code AA
: Approx. 130 mA
Operating temperature
: -5 to +55°C (23 to 131°F)
Operating humidity
: 30 to 90 %RH (non-condensing)
Mounting
: Standard Rack 18KBXx
Weight
: 110 g (0.24 lb)
PERFORMANCE in percentage of span
Accuracy
: ±0.1 %
Temp. coefficient
: ±0.015 %/°C (±0.008 %/°F)
Response time
: ≤ 0.5 sec. (0 – 90 %)
Line voltage effect
Supply output
: ±3 % over voltage range
Output signal
: ±0.1 % over voltage range
Insulation resistance
: ≥ 100 MΩ with 500 V DC
Dielectric strength
: 500 V AC @ 1 minute (input to output 1 to output 2 to power to ground)
EXTERNAL DIMENSIONS unit: mm [inch]
TERMINAL ASSIGNMENTS
SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM
■OUTPUT CODE: 6A
■OUTPUT CODE: A6, AA