Alecto E1842C User manual

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CURRENT TRANSDUCER
E1842C
Operation manual
49501860.3.0015 РЭ

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Contents
1Description and operation.........................................................................3
1.1 General Information..........................................................................3
1.2 Characteristics...................................................................................4
1.3 Construction......................................................................................5
1.4 Functional description.......................................................................6
1.5 Marking and sealing..........................................................................6
1.6 Packing..............................................................................................6
2Intended use...............................................................................................7
2.1 Operational constraints......................................................................7
2.2 Preparation for use.............................................................................7
2.3 Use.....................................................................................................7
2.4 Operation in extreme conditions........................................................8
3Maintenance and repair..............................................................................9
3.1 Safety..................................................................................................9
3.2 Order of maintenance.........................................................................9
3.3 Troubleshooting data..........................................................................9
3.4 Metrology monitoring.......................................................................10
4Storage.......................................................................................................11
5Transportation............................................................................................11
Annex A. Transducer Schematic...................................................................12
Annex B. General Form of the Transducer...................................................14
Annex С. Variants of Transducer mounting.................................................15

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This operation manual contains information for using and operating Current Transducer E1842C
(hereinafter Transducer) and information on its packing, transportation and storage.
Carefully read this manual before operation.
1 Description and operation
1.1 General Information
1.1.1 Transducer converts alternating current (AC) to unified output signal direct current (DC).
Transducers can be used for monitoring currents in diagnostic electrical equipment and another electric
systems; for complex automation of various types of industrial facilities.
Transducer is a single-channel hardware product. Transducer requires no power supply.
Transducer corresponds to engineering factors ТУ 4227-008-49501860-02.
Transducer is mounted on the rail TH-35 in accordance with ГОСТ Р МЭК 60715-2003
or immediately on the panel.
Transducer is hardware SSI product of the third order according to ГОСТ 12997-84.
Protection of the transducer against environmental activity is ordinary.
Guard level: IP00 (ГОСТ 14254-96, IEC 529-89).
Operating Environment:
-Climatic affecting for C4 Group (ГОСТ 12997-84):
- Ambient Air Temperature ...................................-30C to 50C;
- Relative Humidity at 35C .................................up to 95 %;
-Atmospheric affecting for P1 Group (ГОСТ 12997-84):
- Atmospheric pressure ..........................................84-106 kPa (630-800 mm Hg).
-Mechanical affecting for N2 Group (ГОСТ 12997-84):
-Vibration frequency up to 55 Hz;
-Acceleration amplitude up to 4,5 g
Standard conditions for use:
- Ambient Air Temperature ...................................20 5 C;
- Relative Humidity................................................30 to 80 %;
- Input frequency, Hz .............................................50,0 0,5;
- Load resistance, ...............................................200 –300;
-Waveform of the input signal is sinusoidal. The distortion factor shall not exceed 2 %.

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1.2 Characteristics
1.2.1 Transducer converts alternating current to unified output signal direct current (DC). Input
current ranges are: from 0 up to 25 A; from 0 up to 50 A; from 0 up to 100 А.
The output current range is from 0 up to 20 mA.
1.2.2 The load resistance range is from 0 up to 500 . Normal range of load resistance values is
from 200 up to 300 .
1.2.3 Limits of the intrinsic error are 0,5 % of fiducial value. Upper
value of output signal range (20 mA) is taken as a fiducial value.
1.2.4 Additional errors due to influencing quantities are given in table 1.
Table 1
Influencing quantity
Values
Limits of additional error, %
Ambient Air Temperature
- 30 to 50 C
0,4 for every 10 °С of
temperature variation
Relative Humidity
to 95% at 35 °С
0,9
Input signal frequency
45 to 65 Hz
0,5
Strength of external magnetic field with
frequency 45-65 Hz, A/m
400 А/m
0,5
Load resistance, 
0 to 200; above 300 to
500 incl.
0,25
1.2.5 Limits of error due to 5 % harmonic distortion:
-for 2-th, 4-th, 6-th, 8-th harmonic ……. 1 % of the fiducial value;
-for 3-th, 5-th, 7-th, 9-th harmonic ……. 2 % of the fiducial value.
1.2.6 Set-up time of performance (heating-up time) is 10 min.
1.2.7 Output signal ripple amplitude is 0,2 % at most.
1.2.8 Transducer satisfies characteristics described in 1.2.3 if:
-set-up (heating-up) time is expired (without regard to overall operation time);
-one of output terminals is grounded;
-transducer is being affected by sinusoidal vibration in accordance with ГОСТ 12997 for N2 Group.
1.2.9 Setting time of output signal for an input step is no more than 1 s.
1.2.10 Transducer remains operable in case if load circuit is broken for long time. In this case,
output voltage does not exceed 30 V.

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1.2.11 Transducer withstands overload of 120 % of input signal for 2 hours .
1.2.12 Transducer withstands short-time overloads by input signal according to table 2.
Table 2
Current
multiplicity
Number of overloads
Duration
Interval between overloads
2
10
10 s
10 s
7
2
15 s
60 s
10
5
3 s
2,5 s
When transducers is being overloaded, its output does not exceed 40 mA (when load resistance value
is 500 ).
1.2.13 Isolation between case and output circuits withstands practically sinusoidal testing
voltage with frequency 45-65 Hz for 1 minute:
-3,5 kV RMS –in standard conditions;
- 2,0 kV RMS –to 95% R.H. at 35C.
1.2.14 Electrical insulation resistance between case and output circuit is, at least:
-100 M- in standard conditions;
- 20 M- to 80% R.H. at 50C;
- 2 M- to 95% R.H. at 35C
1.2.15 Overall dimensions ……. 70x80x77 mm.
1.2.16 Weight ………………… 0,3 kg.
1.2.17 Average mean time to failure ….. 75000 hours.
1.2.18 Average operation time………………….. 10,5 years.
1.3 Construction
1.3.1 General form of Transducer is presented in Annex B.
1.3.2 Transducer has the following parts:
-Case;
-Cover;
-PCB;
-Measuring transformer;
-Latch.
1.3.3 Terminals mounted on cover are also used for fixing PCB in case.
The cover is fixed to case with four self-tapping screws (these screws are sealable).
The transducer has the through hole for putting wire of measured circuit.
The latch ensures mounting the transducer to the rail or panel depending on variant of installa-
tion.

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1.4 Functional description
1.4.1 Transducer utilizes principle of direct conversion. Transducer fall into category of
rectifier-type transducers.
1.4.2 Transducer Schematic is shown in Annex A.
Transducer Schematic is composed of following parts:
-measuring transformer which also provides galvanic isolation, its primary winding is a main
lead of measured circuit;
-bridge rectifier;
-smoothing circuit for decreasing ripple of output signal;
-Current-limiting circuit (based on Zener diodes) which also protect output circuit against
signal of reverse polarity.
1.5 Marking and sealing
1.5.1 The following information is marked on a cover of the transducer:
-Name and type designation;
-Manufacturer’s mark;
-Unit symbols of input and output signals;
-Load resistance range;
-Overvoltage category;
-Module of intrinsic error;
-Designation of numbers and polarity of output terminals;
-Serial number (two last digits describe year of manufacture).
1.5.2 Sealing of the transducer is done with a bitumen mastic №1 (according to
ГОСТ 18680-73) and applies over one of four self-tapping screws.
1.6 Packing
1.6.1 The transducer is delivered in transportation packing.
1.6.2 In transport container thereis:
-Operation manual (1 copy for set of 50 transducers for or for every separate delivery);
-Packing list.
1.6.3 The transducer is packaged in individual packing.
The passport is inserted inside the individual packing.

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2Intended use
2.1 Operational constraints
2.1.1 The transducer is not intended for operation in aggressive and explosive-hazard
environments.
2.1 2 The transducer must not be affected by direct heating from heat source which have
temperature over 50C. The transducer should be placed in buildings where there are no sharp
temperature variations or high-strength sources of magnetic field.
2.2 Preparation for use
2.2.1 After receiving the package, make sure that the packing is not damaged. Then unpack the
package and make sure that content of package is not damaged and every item is in place. List of items
is presented in table 3.
Table 3
Name and nomenclature
Quantity
Transducer
1
Current transducer E1842C. Passport
1
Current transducer E1842C. Operation manual
1*
Individual package
1
Latch
1**
* On a
** Should be installed on case of transducer
2.2.2 Check the information on a cover of the transducer for correspondence with required
parameters.
2.3 Use
2.3.1 To provide safety, all operations on mounting and maintenance should be done with
respect to rules of safe usage of electric systems in which transducers should be installed.
2.3.2 Layout work at place of installation should be done according to Annex C.
2.3.3 Installation of the transducer on plant
2.3.3.1 When mounting the transducer on the rail:
-place latch on case of transducer (latch snap should be fixed to ledge on case);
-fix lower snaps of latch on edge of rail and then gently push at the case of transducer until it is
fixed on rail.
Mounting on rail can be done if rail is mounted to horizontal or vertical surface.
When the rail is mounted on the vertical plane, its distortion from horizontal position should
not exceed 15°.
2.3.3.2 When mounting the transducer on the panel:

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-unfix latch from case
-fix a latch on the panel using two screws (4mm diameter) according to figure C.2;
Use two screws with a diameter 4 mm to fasten a latch on the panel. Screws should not overhang
mounting plane of the latch.
When mounting the transducer on latch, it is necessary to provide free space of at least 15 mm for
first mounting of transducer.
2.3.4 Put a main lead of measured circuit trough the hole of the transducer.
2.3.5 Fix wires to output terminals with respect to polarity.
2.3.6 Make sure that transducer input signal range is suitable for measuring current of the circuit.
2.3.7 Turn on an input signal on the transducer.
2.4 Operation in case of emergency
2.4.1 In case of emergency, input signal should be immediately turned OFF.

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3Maintenance and repair
3.1 Safety
3.1.1 Only qualified personnel should execute operations on maintenance.
3.1.2 The transducer meets ГОСТ Р 52319-2005 (IEC 61010-1:2001).
Insulation class - primary. Pollution degree is 2. Overvoltage category is III. Rated voltage of
measurable circuit is up to 660 V.
3.1.3IT IS FORBIDDEN TO MAKE EXTERNAL CONNECTION IF INPUT SIGNAL IS ON.
3.2 Order of maintenance
3.2.1 It is recommended to carry out routine inspection in field quarterly. For this purpose:
-turn input signal OFF;
-remove dust from case of transducer;
-examine case, connectors and mountings for absence of mechanical damage;
-after inspection is done, turn ON input signal
3.2.2 To unfix transducer from rail, insert screwdriver in groove located at lower part of
transducer case.
3.3 Troubleshooting
3.3.1 Faults, probable reasons and solutions are given in table 4
Table 4
Fault
Probable reason
solution
There is no voltage at
transformer winding
Brake or short-circuit of
transformer winding
Replace transformer
No output signal while input
signal is ON
Break or short-circuit in wiring
Check voltage on C1-C3
capacitors. Eliminate break
or short-circuit
There is no voltage at the
output of rectifier
Bridge Rectifier (V1) has
failed
Replace bridge rectifier
Intrinsic error exceeds
an acceptable value
insignificantly
It is necessary to adjust the
transducer
Adjust the transducer using
additional adjustment
windings of the transformer

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3.3.2 All faults should be eliminated by repair enterprise. After repair, transducers should pass
calibration and be resealed.
3.3.3 Approximate voltages at main components of the transducer are given in
table 5. These values are true for 500 of load resistance.
Table 5
Circuit element
Voltage (10%)
alternating
direct
Winding of the transformer T1
25 V
Capacitor С1
24 V
Capacitor С2
22 V
Capacitor С3
10 V
3.4 Metrology monitoring
3.4.1 To be sure that metrological characteristics are acceptable and are in accordance with
metrological characteristics presented in this manual, transducer should be calibrated every 2 years.
Calibration procedure should be done in accordance with document 49501860.3.0009 МП
«Преобразователь измерительный переменного тока Е1842С. Методика поверки» (E1842C
Current Transducer. Calibration procedure).
Recalibration interval is 2 year.

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4Storage
4.1 Before putting in operation, transducers should be stored in storehouses according to
ГОСТ 12997-84.
4.2 Storage conditions for transducers packed in transportation package:
- Ambient Air Temperature ...................................................... 5 to 40 °С;
- Relative Humidity at 25 C .................................................. up to 80 %.
4.3 Storage conditions for transducers in individual package:
- Ambient Air Temperature ...................................................... 10 to 35 °С;
- Relative Humidity at 25 C .................................................. up to 80 %.
4.4 The contents of a dust, steams of acids and alkalis, aggressive gases and other harmful ad-
mixtures leading to corrosion should not exceed maximum tolerable value of content of corrosion-
active substances for atmosphere of type 1 according to ГОСТ 15150-69.
5Transportation
5.1 When packed in transportation package, transducers can be transported on vehicle of any
type. In case of transportation on plane, transducers should be placed in hermetic heated
chambers.
5.2 Values of climatical and mechanical influencing quantities should be in limits:
- Ambient Air Temperature ...................................................... - 50 to 50 °С;
- Relative Humidity at 35 C .................................................. up to 95 %;
- Atmospheric pressure, kPа (mm Hg) ..................................... 84-106 (630-800).
-Peak value of shock acceleration……………………… 98 m/sec2.

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2
3
R1
R2
"4"
4
5
V2
R3
"
С1
С2
С3
V3
6
7
"3"
Annex А
(informative)
Transducer Schematic
Т1 V1
1
"+"
Input current
Output"
"-"
8
9
10
Element
Name
Quantity.
Remark
С1...С3
Capacitor RLC 013-50 В-47 мкФ ± 20% VISHAYBCCOMPONENTS
3
Capacitor
R1
Capacitor RC-1206-130 Ом ± 5% YAGEO
1
Resistor
R2, R3
Resistor RC-1206-1,2 кОм ± 5% YAGEO
2
Resistor
T1
Transformer (see table)
1
Transformer
according to table
V1
Bridge rectifier MB4S FAIRCHILD
1
Bridge Rectifier
V2
Zener diode 1.5SMC47A ON SEMICONDUCTOR
1
Zener-diode
V3
Zener diode SMAZ12-13 DIODES
1
Zener diode
Designation
Т1
Input AC range, A
49501860.3.0015
49501860.5.0043
0 - 25
-01
49501860.5.0043-01
0 - 50
-02
49501860.5.0044
0 - 100
Figure А.1
+
+
+

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Annex B
(informative)
General Form of the Transducer
Figure B.1

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Annex C
(informative)
Variants of Transducer Mounting
Figure C.1 Mounting on the rail
Figure C.2 Mounting on the panel