Alecto E842A User manual

CURRENT TRANSDUCER
Е842А
Е842С
Operation manual
49501860.3.0009 РЭ

49501860.3.0009 РЭ
2
Contents
1 Description 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
2 Uses to assignment .................................................. ........................... 7
2.1 Operational constraints.................................... ........................... 7
2.2 Preparation for use........................................... ........................... 7
2.3 Use................................................................... ........................... 7
2.4 Operation in extreme conditions ..................... ........................... 8
3 Maintenance and repair ........................................... ........................... 9
3.1 Safety............................................................... ........................... 9
3.2 Order of maintenance ...................................... ........................... 9
3.3 Troubleshooting data ....................................... ........................... 9
3.4 Metrology monitoring ..................................... ........................... 10
4 Storage..................................................................... ........................... 11
5 Transportation.......................................................... ........................... 11
Annex A. Transducer Schematic................................ ........................... 12
Annex B. General Form of the Transducer ................ ........................... 14
Annex С. Variants of Transducer mounting .............. ........................... 15

49501860.3.0009 РЭ
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This operation manual contains information for using and operating Current Transducer
E842A, E842C (further – Transducer) and information on packing, transportation and storage.
Read this manual before operation.
1 Description and operation
1.1 General Information
1.1.1 Transducer is intended for a linear alternating-current converting to unified output sig-
nal of a direct current and can be applied to monitoring currents of electrical systems, in the equip-
ment of technical diagnostics, for an integrated automation of plants of power engineering and dif-
ferent industries.
Transducer corresponds to engineering factors ТУ 4227-007-49501860-00.
Transducer is mounted on the rail TH-35 in accordance with ГОСТ РМЭК 60715-2003 or
immediately on the panel.
Transducer is hardware SSI product of the third order according to ГОСТ 12997-84.
Operating Environment - Group C4 (ГОСТ 12997-84):
- Ambient Air Temperature ............................................-30°C to 50°C;
- Relative Humidity at 35°C ..........................................up to 95 %;
- Atmospheric pressure....................................................84-106 kPa (630-800 mm Hg).
Climatic category: УХЛ3 (ГОСТ 15150-69).
Standard conditions for use:
- Ambient Air Temperature ............................................20 ±5 °C;
- Relative Humidity .........................................................30 to 80 %;
- Atmospheric pressure....................................................84-106 kPa(630-800 mm Hg).
Guard level: IP00 (ГОСТ 14254-96, IEC 529-89).
Transducer is single-channel hardware product without galvanic link between input and
output circuits.

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1.2 Characteristics
1.2.1 Transducer converts alternating current to direct current output signal according to table 1.
Table1
Type Input AC range, АOutput DC range,
mA
Load resistance range, Ω
Е842А 0 – 5 0 – 1000 – 1400 – 2500
Е842С
0 – 0,5
0 – 1,0
0 – 2,5
0 – 5,0
0 – 20 0 – 200 – 300 – 500
Note – The reference range is underlined
1.2.2 Limits of intrinsic error are:
Е842А±1,0 % of the fiducial value;
Е842С±0,5 % of the fiducial value.
1.2.3 Variations from influencing magnitudes given in table 2.
Table 2
Name of influencing magnitude Value of influencing
magnitude
Variation, %
of the fiducial value
Ambient Air Temperature -30 to 50 °С±0,4 on 10 °Сof tempera-
ture variation
Relative Humidity to 95 % at 35°C
±0,9
Frequency 45 to 65 Hz ±0,5
External magnetic field
of frequency 45 – 65 Hz by strength
to 400 A/m
±0,5
Load resistance
Е842А
Е842С
0 to 1000 Ω; more then
1400 to 2500 Ω
0 to 200 Ω; more then
300 to 500 Ω
±0,5
±0,25
1.2.4 When harmonic distortion is 5 %, limits of error are:
- for 2-th, 4-th, 6-th, 8-th harmonic ……. ±1,0 % of the fiducial value;
- for 3-th, 5-th, 7-th, 9-th harmonic ……. ±2,0 % of the fiducial value.
1.2.5 Setup time of performance:
Е842А…………… 5 minutes;
Е842С…………….10 minutes.
1.2.6 Pulsation amplitude:
Е842А………………..0,1 %
Е842С………………..0,2 %
1.2.7 Intrinsic error corresponds:
- on expiring a setup time of performance;
- at grounding one of output contacts;
- when effecting sine-wave vibrations in a frequency band from 10 up to 55 Hz with dis-
placement amplitude 0,35 mm.

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1.2.8 Setting time of output signal is 1s.
1.2.9 Transducer withstands a long-lived break of a load circuit without failures. Output volt-
age at a break of a load circuits is no more than 30 V.
1.2.10 Transducer withstands 120% overload by an input signal during 2 hours.
1.2.11 Transducer withstands short-term overloads by input signal according to table 3.
Table 3
Current multiplicity Number of overloads Duration Interval between overloads
2
7
10
10
2
5
10 s
15 s
3 s
10 s
60 s
2,5 s
Output current, when overloading, is no more:
-30 mA for E842A;
-40 mA for E842C (when load resistance value is 500 Ohm).
1.2.12 Input Power Consumption:
Е842А………….……1 V⋅А
Е842С……………….1,5 V⋅А
1.2.13 Isolation between input and output circuits withstands a testing voltage of practically
sine-wave shape by frequency from 45 up to 65 Hz during 1 min:
- 2,5 kV RMS – in standard conditions;
- 1,5 kV RMS – to 95% R.H. at 35°C.
1.2.14 Electrical insulation resistance of input and output circuits relative to a case and among
themselves is not less:
-40 MΩ- in standard conditions;
-10 MΩ- to 80% R.H. at 50°C;
-2 MΩ- 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 error-free running time ….. 50000 hour.
1.2.18 Average durability………………….. 10 years.
1.3 Construction
1.3.1 General form of Transducer can be seen in Annex B.
1.3.2 Transducer has the following parts:
-Case;
-Cover;
-Component board;
-Measuring transformer;
-Latch.
1.3.3 The contacts established on a cover ensure strengthening a component board and
reliable contact of conductors of a plated circuit to the leads.
The cover is mounted to a case through four screws, which can be sealed up.
The latch ensures mounting the transducer to the rail or panel depending on variant of instal-
lation.

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1.4 Functional description
1.4.1 Transducer is carried out on a principle of direct conversion. It falls into the transducers
of a rectifier type.
1.4.2 Transducer Schematic is shown in Annex A.
Transducer Schematic is composed of following parts:
-measuring transformer which is also element of a galvanic isolation;
-bridge rectifier;
-smoother reducing a ripple of a rectified signal;
-current-limited circuit on the voltage-reference diodes which safeguard simultaneously a
transducer output from occurrence of a signal of a reverse polarity.
1.5 Marking and sealing
1.5.1 The following information is marked on a cover of the transducer:
-The name and type designation;
-Manufacturer’s mark;
-Input and output signals rated;
-Unit symbols of input and output signals;
-Overvoltage category;
-Load resistance range;
-Module of intrinsic error;
-Designation of numbers and polarity of terminal;
-Serial number and two last digits of issue Year.
1.5.2 Sealing of the transducer is yielded with a bitumen mastic №1 (according
to ГОСТ 18680-73) applies on one of four located on a cover screws.
1.6 Packing
1.6.1 The transducers are delivered in transport container.
1.6.2 In transport container there is:
- Operation manual (1 copy for set of 50 transducers or on separate delivering);
-Packing leaf.
1.6.3 The transducer is packaged into individual packing.
The passport is inserted inside the individual packing.

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2 Uses to assignment
2.1 Operational constraints
2.1.1 The transducers are not intended for operation in requirements explosion-hazard and
hostile environment.
2.1 2 The transducers must not be effected by direct heat up to temperature more 50°C. The
transducers should be placed on the premises without sharp temperature fluctuation and off the
sources of strong electromagnetic field.
2.2 Preparation for use
2.2.1 Check integrity of packing after deriving the transducer. Unpack it. Take out the trans-
ducer, make exterior survey, and get sure that any apparent mechanical damages are missing. Check
completeness of delivering according to table 4.
Table 4
Name and nomenclature Quantity
Transducer 1
Current transducer E842A, E842C. Passport 1
Current transducer E842A, E842C. Operation manual 1*
Individual package 1
Latch 1**
* On a batch in quantity 50 pieces, delivered at the one address
** Set on the case
2.2.2 Check the information on a cover of the transducer on correspondence to required
parameters.
2.3 Use
2.3.1 All operations on mounting and maintenance should be making with observance of live
rules on provision of safe service.
2.3.2 Make arranging a place of mounting of the transducer on plant 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 a latch according to figure C.1 to link the protuberances of a case to edge of the rail;
-push a case up to its fixing.
The mounting of the transducer on the rail is supposed at mount the rail on a horizontal or
vertical plane.
When the rail is mounted on the vertical plane, its distortion from a horizontal position should
not be more than 15°.
2.3.3.2 When mounting the transducer on the panel:
-fix a latch on the panel with the help of two screws according to figure C.2;
-pull the transducer over a latch against the stop.

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Use two screws with a diameter 4 mm to fasten a latch on the panel. Screws should not over-
hang a mounting plane of the latch.
When mounting the transducer on a latch it is necessary to provide on object a place not less
than 15 mm for initial fixing of the transducer.
2.3.4 Fix exterior conductive wires on contacts according to the table of connections, which is
located on a cover of the transducer.
2.3.5 Verify the correspondence of output parameters of a radiant of a signal to data-ins of the
transducer. Verify quality of wiring.
2.3.6 Turn on an input signal on the transducer.
2.4 Operation in extreme conditions
2.4.1 You should turn out the transducer immediately in case of originating an emergency
condition of operation.

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3 Maintenance and repair
3.1 Safety
3.1.1 The qualified personnel should execute operations of maintenance.
3.1.2 The transducer corresponds to ГОСТ Р52319-2005 (IEC 61010-1:2001).
3.1.3 IT IS FORBIDDEN:TO CHANGE EXTERIOR ASSOCIATIONS,WHEN INPUT SIGNAL IS AVAILABLE
IN THE TRANSDUCER.
3.2 Order of maintenance
3.2.1 It is recommended quarterly to carry out routine inspection in field. For this purpose:
-to turn input signal off;
-to delete from a case a dust;
-to test a condition of a case; to be convinced of absence of mechanical failures; to test a
condition of mounting;
-to turn input signal on the transducer after the termination of survey on.
3.2.2 If the transducer is mounted on the rail, you can carry demounting by release of a latch
by a screwdriver inserted into a recess in the bottom of the case.
3.3 Troubleshooting data
3.3.1 You can see the enumeration of possible defects and methods of their elimination in table 5.
Table 5
Defect Probable reason Method of elimination
Intrinsic error exceeds
an acceptable value
insignificantly
The tuning of the transformer is
necessary
Make tuning with the help of by
adjusting windings of the trans-
former
The output signal is not present
at presence of an input signal
Break or short closure in wiring Check voltages on capacitors
С1, С2, С3.
Eliminate break or short closure
The voltage on secondary
windings of a measuring trans-
former misses
Break or short closure of secon-
dary windings of the
transformer
Exchange an transformer
The voltage on an rectifier out-
put misses
One of diodes (V1 - V4) does
not work
Exchange an out-of-order diode
3.3.2 The specialized repair enterprise eliminates all failures.
The transducer should pass calibration after repair and be sealed up.

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3.3.3 You can see the mode of operations of Е842Аkey elements in table 6 (for load
resistance 2,4 kΩ).
Table 6
Circuit element Voltage ( ±10%)
alternating direct
Secondary winding of the
transformer Т1
32 V
Capacitor С1 31 V
Capacitor С2 27 V
Capacitor С3 12 V
3.3.4 You can see the mode of operations of Е842Сkey elements in table 7 (for load
resistance 500 Ω).
Table 7
Circuit element Voltage ( ±10%)
alternating direct
Secondary winding of the
transformer Т1
25 V
Capacitor С1 24 V
Capacitor С2 22 V
Capacitor С3 10 V
3.4 Metrology monitoring
3.4.1 To confirm real values of the metrology characteristics and fitness of the transducer to
application, they can be exposed to calibration according to the document 49501860.3.0009 МП
«Преобразователи измерительные переменного тока Е842А, Е842С. Методика поверки»
(Current transducers E842A, E842C. Calibration procedure), which was matched with ВНИИМС
(All-Russian Research Institute).
The transducer should be calibration on 1-year interval determined by the requirements of this
document.

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4 Storage
4.1 Before introduction in operation the transducers should be stored in storehouses according
to ГОСТ 12997-84.
4.2 Storage conditions for transducers in transport container:
-Ambient Air Temperature ………………………5 to 50 °C;
-Relative Humidity at 25°C …………………….. up to 80 %.
4.3 Storage conditions for transducers in individual packing:
-Ambient Air Temperature ………………………10 to 35 °C;
-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
admixtures calling corrosions should not exceed the contents of the corrosion-active agents for the
atmosphere of a type 1 (ГОСТ 15150-69).
5 Transportation
5.1 The transducers in transport container can be transported in the closed vehicles of any
kind.
When air transportation the transducers should be disposed in heated hermetic bays.
5.2 Values of climatic and mechanical effects on the transducer at transportation should be in
limits:
-Ambient Air Temperature ………………………-50 to 50 °C;
-Relative Humidity at 35°C ……………………...up to 95 %;
-Atmospheric
-pressure…………………………….84 to 106 kPa (630 to 800 mm Hg);
-Impacts with peak shock acceleration …………... 98m/sec2.

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Annex A
(informative)
Transducer Schematic
Resistor
Стабилитрон КС524ГХЫ0.336.000 ТУ
0 - 5,0
Name
V5
Наименование
Резистор С2-33м-0,25И-3 кОм+-5% А-ДШКАБ.434110.007ТУ
"1"
Voltage-reference
"+"
49501860.5.0023
"-"
+
С1
T1
Resistor
R2
V1 - V4
Конденсатор К50-35 - 63 В- 10 мкФ
4
Примечание
Remark
1
1
R2
0 - 1,0
49501860.5.0023-03
"2"
Input AC range, A
49501860.3.0009
V5
Diode
-02
Кол.
0 - 0,5
Входной ток, А
-03
49501860.5.0023-02
С1...С3
"4"
Т1
1
2
3
4
5
6
7
8
9
10
Quant
3
Трансформатор (см. табл.)
0 - 2,5
Резистор С2-33м-0,25И-680 Ом+-5% А-ДШКАБ.434110.007ТУ
1
"3"
Диод КД522БдР3.362.029 ТУV1...V4
Т1
R1
Transformer
according to table
49501860.5.0023-01-01
R1
1
Поз.
Pozition
Designation
+
С3"Output"
Обозначение
Capacitor
+
С2
"Input"
Figure А.1 Transducer Е842А

49501860.3.0009 РЭ
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49501860.5.0024-03
Resistor
V6
"1"
Т1Input AC range, A
Philips
Резистор С2-33м-0,5И-560 Ом+-5% А-ДШКАБ.434110.007ТУ
-06
Quant
49501860.5.0024-02
Диод КД247ГаАО.336.838 ТУ
R1
Поз.
Pozition
0 - 2,5
0 - 0,5
0 - 1,0
1
"-"
Резистор С2-33м-0,25И-130 Ом+-5% А-ДШКАБ.434110.007ТУ
Voltage-reference
R2
Т1
1
2
3
4
5
6
7
8
9
10
11
12
1
V1 - V4
-07
Capacitor RLC 013 47mkF/ 50 V; +- 20%
"2"
49501860.5.0024-01
1
V5
"Output"
4
R1
Remark
"4"
Стабилитрон Д816ДаАО.336.545 ТУ
49501860.3.0009 -04
1
Resistor
Designation
Наименование
Voltage-reference
Трансформатор (см. табл.)
"3"
+
С2
3
V5
-05
Примечание
Name
Стабилитрон КС512АаАО.336.002 ТУ
С1...С3
V6
Transformer
according to table
0 - 5,049501860.5.0024
DiodeV1...V4
+
С3
Кол.
"+"
R2
Входной ток, А
T1
+
С1
1
Обозначение
"Input"
Figure А.2 Transducer Е842С

49501860.3.0009 РЭ
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Annex B
(informative)
General form of the transducer
Figure B.1

49501860.3.0009 РЭ
Annex С
(informative)
Variants of Transducer mounting
15
Figure C.1 Mounting on the rail
Figure C.2 Mounting on the panel

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