SC420i User Manual Datasheet by Cynergy 3

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SC420i / 420V USER MANUAL
IIG-9605-03 Page 1
SC420 FAMILY
OF
ISOLATING SIGNAL CONDITIONERS
SC420i / 420V
Whilst every effort has been taken to ensure the accuracy of this document, we accept no
responsibility for damage, injury, loss or expense resulting from errors or omissions, and
reserve the right of amendment without notice.
Cynergy3 Components Limited
This document is issued by Cynergy3 Compoents Ltd and may not be reproduced in any way
without the prior written permission of the company.
CONTENTS
SCSC420i / 420V USER MANUAL
Page 2 IIG-9605-03
C O N T E N T S
PAGE
1.0 INTRODUCTION 3
2.0 UNPACKING 5
3.0 CONNECTIONS 5
4.0 RECONFIGURATION
(applies to reconfigurable
420 V units only)
6
5.0 RECALIBRATION 6
6.0 INSTALLATION 7
7.0 SPECIFICATIONS 8
Cynergy3 Components Ltd, Ferndown Industrial Estate,
Wimborne, Dorset, BH17 9FE, UK
Tel: 01202 897969, Fax: 01202 891918
sales@cynergy3.com
www.cynergy3.com
Max load resistance/Q Input Current Range Output Vultnge Range
SC420i / 420V USER MANUAL
IIG-9605-03 Page 3
1.0 INTRODUCTION
The SC420 i / 420 V is a family of input loop powered signal conditioners capable of accepting a wide
variety of mA input ranges and providing an isolated voltage or current output.
The family comprises three basic models each with a standard configuration, custom variants being
available to special order.
The different formats are as shown below. Input signal and output signal information are required to
define any unit exactly. This information, together with a unique serial number, is printed on the side
label of each unit; records of the exact configuration of every product shipped are maintained at the
factory.
1.1 Members Of The Family
SC420 i
The basic SC420 i provides 1 to 1 galvanic isolation of DC currents between 0 and 50 mA, covering
the standard 0 - 20 mA and 4 - 20mA ranges as well as 0 - 1mA, 0 - 5mA and 0 - 10mA, with the
accuracy specified in section 7. (2 to 1, 4 to 1, 1 to 2 and 1 to 4 ratios are also possible, although a
minimum order quantity may apply in these cases). There are no adjustment potentiometers on the
SC420 i, accuracy being inherent in the circuit design.
The output signal is always proportional to the input signal - i.e. no offset can be added or subtracted.
The maximum loop resistance that can be driven by the SC420 i and the maximum voltage drop of the
SC420 i itself are as follows:
Full Scale Input/mA Max load resistance/ Max voltage drop /V
1 12,000 2.0
5 2,500 2.5
10 1,300 3.0
20 650 3.5
50 200 6.5
SC420 i - 1
The basic SC420 i - 1 provides a 5V DC output for a 20mA DC input, i.e. 0 - 20 mA at the input
provides 0 - 5V output, 4 - 20mA input providing 1 - 5V output. Many variations are possible with the
accuracy specified in section 7 provided that the following limits are observed:
Input Current Range Output Voltage Range
Min Max Min Max
0 - 1mA 0 - 50mA 0 - 100mV 0 - 12V
There are no adjustment potentiometers on the SC420 i - 1, accuracy being inherent in the circuit
design. The output signal is always proportional to the input signal - i.e. no offsets can be added or
subtracted.
The minimum input resistance that the output of the SC420 i - 1 should look into, to avoid loading of
the output, can be calculated as follows:
R
in (V out / I in) 1000
Where I in is the full scale input to the SC420 i-1 in mA, V out is the full scale output in volts and R
in is in K.
e.g. Input= 4 - 20mA; output = 1 - 5V
R in 250 K
SCSC420i / 420V USER MANUAL
Page 4 IIG-9605-03
420 V
The basic 420V can be reconfigured by the user to provide a 0 - 10V DC output for either a 4 - 20mA
or a 0 - 20mA DC input. (Additionally a 2 - 10 V DC output with 4 - 20 mA input can be selected).
Unless specified at point of order the default configuration (4 - 20mA in, 0 - 10V out) will be set.
A 0 - 5V or 1 - 5V reconfigurable version is also available by special request - contact factory for
details.
Many variations are possible with the accuracy specified in section 7 provided that the following limits
are observed:
Full Scale Input Current Minimum Span Output Voltage Range
Min Max Min Max
1mA 50mA 50% full scale 0 - 100mV 0 - 20V
The 420 V has zero and span potentiometers and allows offsets on the input signal to be removed (e.g.
4 - 20mA in, 0 - 10V out). Furthermore the full scale voltage drop from the input loop is usually less
than the output voltage (e.g. at 10V output, input voltage drop from 20mA loop is typical 5V).
The minimum input resistance that the output of the 420V should look into, to avoid loading of the
output can be calculated as follows:
R in (V out/ I span). 4000
Where I span is the difference between the full scale and minimum scale input to the 420V in mA, V
out is the full scale output in volts and R in is in K
e.g. Input = 4 - 20mA; I span = 16
Output = 0 - 10V
R in 2,500 K = 2.5M
However since the span of the 420V is adjustable, loads up to 100 times smaller than this can be
accommodated by individual calibration. e.g. in the above case a resistance as low as 25K can be
handled.
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SC420i / 420V USER MANUAL
IIG-9605-03 Page 5
2.0 UNPACKING
Please inspect the instrument carefully for signs of shipping damage. The unit is packed to give
maximum protection but we can not garantee that undue mishandling will not have damaged the
instrument. In the case of this unlikely event, please contact your supplier immediately and retain the
packing for our subsequent inspection.
2.1 Checking the Unit Type
Each unit has a unique serial number label (fig. 1 below) on which full details of the configuration are
given. These details should be checked to ensure conformance with your requirement.
Fig. 1 - Serial Number Label
SC420i SC420V
Fig. 2 - Front Panel Labels
3.0 CONNECTIONS
This section details the instrument connection information. Before proceeding, please check the
information on the serial number label on one side of the unit to ensure that the unit configuration is
correct. Connection details are given on the front panel label shown in fig. 2 above.
3.1 Inputs
Input current should not exceed 50mA; otherwise damage to the unit may result. The SC420 i/ 420 V
are unipolar devices - i.e. input and output do not respond to negative signals. However reverse
polarity connection will not damage the unit provided the maximum current criterion is not exceeded.
IMPORTANT: Do not apply low impedance voltage signals to input or output otherwise damage
will result. (e.g. 24V DC supply).
j II= I: Fit} , Snldcr Brid 0 Link Sclccuon of In m Range In m Ran B On: ul mu SI
SCSC420i / 420V USER MANUAL
Page 6 IIG-9605-03
4.0 RECONFIGURING THE INSTRUMENT (applies to reconfigurable 420V units only)
In many cases the instrument will have been factory configured to the required specifications, and
calibrated, in which case this section can be ignored.
If a particular configuration is not specified then the default (specified below) will be supplied.
4.1 Input Configuration
The section details the steps required to reconfigure the unit, after which recalibration will be
necessary.
(If the configuration is not specified at the time of order the default configuration of 4 - 20mA input, 0
- 10V output will be set).
B3 B1
B7
B5
B6
B4 B2
Fig.3 - Solder Bridge Link Selection Of Input Range
To reconfigure the instrument remove the side cover without the serial number label, from the unit -
this cover is a push fit and can be prised off with a thumb nail or small screwdriver. The five links B1,
B2, B5, B6,B7, should be open or short circuit according to the following table:
Input Range Output Range B1 B2 B5 B6 B7
0 - 20 mA 0 - 10 V Open Short Short Short Short
4 - 20 mA 0 - 10 V Short Short Short Short Open
4 - 20 mA 2 - 10 V Open Short Short Short Short
WARNING: TAKE GREAT CARE NOT TO DAMAGE THE DELICATE COMPONENTS
ADJACENT TO THE LINKS
B3 and B4 can be ignored
After reconfiguration replace the side cover.
5.0 RECALIBRATION
The SC420 i and SC420 i -1 units are not recalibratable but have their test data recorded at the factory.
All SC420 V units are factory calibrated; although the user may wish to recalibrate with greater
frequency, a two yearly recalibration interval is adequate for most applications.
In the case of reconfigurable units, recalibration must be carried out after any change of configuration.
With appropriate input values use front panel zero and span pots to obtain desired zero scale and full
scale voltage output (preferably with actual output circuit connected, for greatest accuracy). It may be
necessary to repeat each adjustment to ensure correct calibration.
SC420i / 420V USER MANUAL
IIG-9605-03 Page 7
6.0 INSTALLATION
6.1 Installation onto Rails
The instrument is designed to mount directly onto either the ‘Top hat’ TS35 standard assembly rail to
DIN 46277 part 3/EN 50022/BS5584, or the asymmetrical 32mm G-rail to DIN 46277 part
1/EN50035/BS5825.
6.2 Mounting Arrangements
Ideally the unit should be mounted in a vertical position, i.e. on a horizontal rail. This is the optimum
orientation to minimise temperature rise within the unit. However successful operation is possible in
any orientation.
Ensure the maximum ambient temperature is less than 70oC.
Good airflow around the unit will maximise reliability.
6.3 Wiring Precautions
The unit can accept a variety of sensor inputs, some of which produce very small signals. Therefore it
is advisable to adhere to the following rules of good installation practice.
(i) Do not install close to switchgear, electromagnetic starters, contactors, power units or motors.
(ii) Do not have power or control wiring in the same loom as sensor wires.
(iii) Use screened cable for sensor wiring with the screen earthed at one end only.
(iv) Take care not to allow cut pieces of wire to fall onto the unit as they might enter via the
ventilation holes and cause eletrical short circuits. If in doubt, remove the units from the rail
until wiring is complete.
(v) Use bootlace ferrules on all bare wires.
IMPORTANT: The connection terminals are designed for a maximum torque of 0.4Nm.
Exceeding this figure is unnecessary and will result in unwarrantable damage to the unit.
SCSC420i / 420V USER MANUAL
Page 8 IIG-9605-03
7.0 SPECIFICATIONS
All specifications are at 20oC operating ambient unless otherwise stated.
Accuracy and Response
SC420 i
Maximum output current error 0 - 20mA into 250 30µA
Linearity +/- 0.1% full scale
Output current variation with load resistance, RL (20mA
input) -200nA/ max, 0 RL 600
Response Time (90% of step change) 30ms typical
Max Input Voltage drop (20mA input, R
L
= 0) 3.5V
Temperature coefficient of output (20mA input) 90ppm / oC max
SC420 i -1
Maximum output voltage error (0 - 5 V into 1M) 13mV
Linearity +/- 0.1% full scale
Response Time (90% of step change) 30ms typical
Max Input Voltage drop (20mA input, 5V output) 8.5V
Temperature coefficient of output 90ppm / oC max
SC420 V
Calibration accuracy at zero and full scale (into 10M) +/- 0.05% full scale
Linearity +/- 0.1% full scale
Zero drift +/- 50ppm full scale /oC
Gain drift +/- 90ppm /oC
Response time (90% of step change) 30ms typical
Max input voltage drop (20mA input, 10V output) 5.5V
Isolation and operating Ambient (all types)
Input to output isolation 1kV DC
Operating temperature range -15 - 70oC
Storage temperature range -40 - 100oC
Operating and storage humidity range 0 - 90% RH
EMC (all types)
EMC BS EN61326
LVD Standards EN61010-1
Installation Category (IEC 664) II
Pollution Degree (EN61010-1) 2
Equipment Class (IEC 536) II

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