IPS109-2
January 1997
MTL ICC300 SERIES
ICC312 repeater
power supply,
4 to 20mA,
for 2-wire
transmitters
with dual outputs
Three-port isolation
between inputs, outputs
and power supply
* Provides two outputs from
one 4 to 20mA transmitter
* Line-fault detection
feature provides alarm
facilities
* Transfer accuracy better
than 0.1% of span
* 20 to 35V dc power
supplies
* T- or G-section DIN-rail
mounting
The ICC312 is an independently powered isolator which provides both a fully isolated dc
supply for energising a two-wire transmitter (or other 4 to 20mA current source) while also
transferring the transmitter current to two separate isolated output circuits driving loads up to
1k. Line-fault detection facilities (also isolated) are provided by an open collector which can
be used to activate an alarm. When the input cable is broken, no current flows into terminal 8
and the line-fault detection (LFD) output is OFF. When a current greater than 1mA flows in the
input, then LFD output is ON. Power supply required is 20 to 35V dc.
SPECIFICATION
Number of input channels
One (either terminals 7&8 or 8&9)
Input channel (terminals 7 & 8)
2-wire transmitter supply: 4 to 20mA
Power requirements (supplying a
transmitter)
150mA maximum at 20V dc with a
20mA signal
120mA maximum at 35V dc with a
20mA signal
Power requirements (from a current
source)
110mA maximum at 20V dc with a
20mA signal
90mA maximum at 35V dc with a
20mA signal
Input channel (terminals 8 & 9)
4 to 20mA current source
Number of output channels
Two
Input signal
4 to 20mA
Load resistance
0 to 1k
Isolation between input, output 1,
output 2 and power supply
1500V dc/ac
Transfer accuracy at 25 C for both
outputs
Better than 20 A
Power supply
20 to 35V dc
Line-fault detection (LFD) output
Transistor open collector output
Voltage available for transmitter
20V minimum at 20mA
Voltage drop across input from
current source (terminals 8 & 9)
2.4V maximum
Circuit diagram
ICC312
4 to 20mA
4 to 20mA
Current source
24V
2k
8
9
2
3
10
4 4 to 20mA
11
12 LFD
6 4 to 20mA
+
20 to 35V dc
Load
Load
Dimensions and mounting (in mm)
79
Terminals
7, 8, 9, 10, 11, 12
15
Terminals
1, 2, 3, 4, 5, 6
40
Response time
To reach 90% of span: 80ms
To reach 99.9% of span: 280ms
LFD characteristics
Input current <0.2mA
Transistor OFF
Maximum permitted voltage:
26V dc
Maximum OFF leakage current: 150A
Input current >1mA:
Transistor ON
Maximum permitted input current: 50mA
Maximum ON voltage:
1V
Temperature drift
<1A/ C
Common mode rejection ratio
150dB typical
Ambient temperature limits
-20C to +55 C (operating)
-40C to +80 C (storage)
Humidity
5 to 95% RH, non-condensing
Terminals
Accommodate 2.5mm2 conductors
Casing
40mm width polyamide casing
Mounting
Directly onto T- or G-section DIN-rail to DIN46277
MTL Instruments Pvt Ltd
No 3 Old Mahabalipuram Road, Sholinganallur, Chennai 600119
Tel: 91 44 2450 1552 , 91 44 2450 2477 Fax: 91 44 2450 1657
Email:info@mtlindia.com
A member of The MTL Instruments Group plc
G-section rail
(DIN 46277)
Insert screwdriver to
release box
T-section rail
(DIN 46277)
TO ORDER:ICC312
Repeater power supply, 4 to 20mA, with dual outputs
