ELECTREX DEPT Electrical Parameter Transducer, EST Energy Supervision Transducer, DEC Digital Energy Counter, DEC-3 Three-phase Digital Energy Counter User Manual
The ELECTREX DEPT, EST, DEC, and DEC-3 are electrical parameter transducers designed for a wide range of applications, including process control, regulation, data acquisition, and energy cost management. These devices offer various functions, including active power, reactive power, power factor, and apparent power measurements. They can be configured for single-phase, balanced three-phase, or unbalanced three-phase networks and have programmable full-scale ranges for voltage and current. The output options include 4-20 mA signal, pulse output, or RS485 data interface, making them compatible with various systems.
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USER MANUAL energy with imagination
INDEX
CE MARK DECLARATION OF CONFORMITY ....................................4
1 SAFETY ........................................................................................4
2 PRESENTATION ...........................................................................5
2.4 VOLTAGE MEASUREMENT CONNECTION ........................................................ 7
2.4.1 THREE-PHASE 3 -WIRE DELTA NETWORK (
) ....................................... 7
2.4.2 THREE-PHASE 4-WIRE STAR NETWORK ( ) ........................................... 7
2.5 CURRENT MEASUREMENT CONNECTION ........................................................ 8
3 WIRING DIAGRAMS ......................................................................8
3.2 EST, DEC-3 and DEC3-485 WIRING DIAGRAMS .................................................. 9
3.2.1 Three-phase 3 -wire delta network (
) ................................................................ 9
3.2.2 High voltage Three-phase 3 -wire delta network with CT and VT (
4 TECHNICAL SPECIFICATIONS .....................................................12
4.3.1 Single-phase formulae (DEPT/DEC/DEC-485) ................................................ 14
4.3.2 Three-phase formulae(EST/DEC-3/DEC3-485) ............................................... 14
5 TRANSDUCER OPERATION .........................................................15
5.3.3 Specifications of RS485 transmission and reception procedure ............................. 25
5.5 Connection of over 32 instruments (or instruments installed over 1000 m from the
TERMS OF WARRANTY
The warranty is valid starting from the manufacturing date, as evidenced on the receipt of the calibration certificate, for the period indicated on the package. If not specified, the warranty will cover the equipment for a year from the purchasing date, anyway not over 18 months from the manufacturing date.
The warranty covers the free repair or substitution of equipment parts which are recognized as faulty due to manufacturing defects.
The warranty does not cover those parts which result defective due to negligent or improper use, incorrect installation or maintenance, operation by unauthorized personnel, damage during transportation, or which in any case do not indicate manufacturing defects of the equipment.
Also excluded from the warranty are technical interventions regarding the installation of the equipment. Also excluded from the warranty are technical interventions regarding the installation of the equipment to the electrical system.
The manufacturer declines any responsability for eventual injury or damage to persons, animals or things as result of failure to follow the instructions in the Instructions Manual or caused by improper use of the equipment.
The warranty covers equipment returned ex works. The expenses of transport as well as the relative risks of same, both to and from the place of repair, will be the sole responsability of the
User. This warranty expires after the date of purchase and any assistance required after said date including spare parts, labor, transport of personnel and materials will be charged to the User basated on the tariffs in force for Technical Assistance Service at the time of such requested service. In any case the substitution of the equipment as well as the extension of the warranty after such breakdown is excluded.
3 di 36
ELECTREX hereby declares that its range of transducers complies with the EMC requirements of
Directive 89/336/EEC and also the requirements of the following standards:
EMISSIONS = EN 50081-1 1992
[ EN 55022-CLASS B
CI S PR 22 ]
IMMUNITY= EN 50082-1(light industry) 1992
EN 50082-2 (heavy industry) 1994
IEC 1000-4-4 2kV on signals 4kV on power supply
SAFETY= IEC 1010
COMPLIANCE WITH IEC 1036 DIRECTIVE = energy measurement, CLASS 1 accuracy
The packaging of each instrument bears a "CE" mark of conformity.
1 SAFETY
F
This instrument was manufactured and tested in compliance with class 2 IEC 1010 and VDE 411 standards, in accordance with group C VDE 0110 standards for operating voltages up to 500 VACrms.
Quality and accuracy are guaranteed by an ISO9000 certified production structure which utilizes the latest surface mounting techniques, therefore the instrument left the factory in perfect condition regarding technical safety.
In order to maintain this condition and to ensure safe operation, the user must comply with the indications and markings contained in the following instructions: l
When the instrument is received, before beginning installation, check that it is still intact and no damage was incurred during transport.
l
Before mounting, ensure that the operating voltage and mains voltage set are the same, and then proceed with installation.
l
The instrument unit is double insulated and does not require an earth connection. The power supply must be connected to phase and neutral as shown in the relevant diagram.
l
A 50 mA T type HBC fuse should be installed in the power supply circuit to the instrument.
l
The power supply must be connected before the measurement circuit.
l
Before any maintenace and/or repairs, whenever the instmrument must be opened, it must be disconnected from all power sources.
l
The instrument’s capacitors may still be charged even after it has been disconnected from all power sources.
l
Maintenance and/or repairs must be carried out only by qualified, authorized personnel.
l
If there is ever the suspicion that safe use is no longer possible, the instrument must be taken out of service and precautions taken against accidental use.
l
Operation is no longer safe when:
1) There is clealy visible damage.
2) The instrument no longer functions.
3) After lengthy storage in unfavorable conditions.
4) After serious damage incurred during transport.
1.1 Operator safety
F
Read these pages carefully before installing and utilising the instrument
The instrument described in this user manual is intended for use by properly trained staff only.
Maintenace and/or repairs must be carried out only by authorized personnel.
For proper, safe use of the instrument and for maintenace and/or repair, it is essential that the persons instructed to carry out these procedures follow normal safety precautions.
1.2 Symbols
READ THE INSTRUCTIONS
1.3 Precautions in case of breakdowns
If it is suspected that the instrument is no longer safe, for example due to damage incurred during transport or use, it must be taken out of service and precautions taken to prevent accidental use.
Contact authorized technicians for checks and any repairs.
2 PRESENTATION
Sophisticated engineering backed by years of specialist experience in the electronics and electrotechnical sector have enabled ELECTREX to develop an innovative range of programmable microprocessor-based transducers for electrical parameters whose outstanding versatility and ease-of-application satisfy a wide range of customer requirements in terms of electrical parameter control and energy cost management.
Advanced auto-compensation technology guarantees excellent measurement reliability and stability, even in the most adverse operating conditions. Instruments are housed in a modular-designed case (6 modules for DEPT - EST- DEC; 9 modules for DEC-3) suitable DIN rail mounting (35 mm rail). All circuits and internal insulation comply with industrial grade international standards (IEC 1010 - VDE 411, Class 2).
Instruments are suitable for installation in singlephase, balanced three-phase (DEPT and DEC) or unbalanced three-phase 4-wire star and 3 -wire delta (EST and DEC-3) networks.
Measurements are RMS values with automatic current (3 scales) and voltage (2 scales) scale change.
Functions are easily selected by dip-switch.
The following models are available :
DEPT
Digital electrical parameter transducer for installation in Single-phase or balanced Threephase networks (available with 4-20 mA signal output, pulse output or RS485 data output).
EST
Energy supervision transducer for installation in unbalanced Three-phase 4-wire star or 3-wire delta networks (available with 4-20 mA signal output, pulse output or RS485 data output).
DEC
Digital energy counter for installation in Single-phase or balanced Three-phase networks
(available with pulse output or RS485 data output).
3-wire delta networks (available with pulse output or RS485 data output).
2.1 Instrument description
DEPT EST
DEC
DEC-3
Voltage input terminals
Power supply terminals
Output terminals
Function selection dip-switch
DIN rail mounting hook
Cable holes for CT secondary cables
7-digit electro-mechanical counter
2.2 DIN RAIL MOUNTING
Raise the black plastic hook on the botton of the instrument using a screwdriver and fit it onto the rail (see
Fig. 1).
2.3 POWER SUPPLY
described in chapter 5 (page 15 for DEPT 4-20 / EST 4-20; page 18 for DEPT-P / EST-P /
DEC / DEC-3; page 23 for DEPT-485 / EST-485). Programming modifications made while the instrument is powered up will not be accepted.
The instrument must be powered by a 200-240 VAC 50/60 Hz voltage (100 -120 VAC 50/60 Hz is also available on request) using a 4 mm
2
(max.) cable connected to the screw type power supply terminals as shown in Fig. 2. The instrument’s power supply does not require an earth connection. The instrument is not fitted with a protection fuse. A 50 mA T HBC fuse must therefore be connected to the power supply circuit.
D E C -3 / D EC 3-4 85
(
200÷240VAC
(100÷120VAC)
D EP T / E S T
D E C /D EC -485
50 mA T
200÷240VAC
(100÷120VAC)
2.4 VOLTAGE MEASUREMENT CONNECTION
Using cables with max. cross-section of 4 mm
2
, attach them to the voltage measurement screw terminals.
The following diagrams illustrate how to connect the terminals to the phases.
Follow the diagrams to make the correct voltage measurement connection in relation to the type of instrument used and the system in which it is installed.
(*) The 500 VAC limit is imposed by standards.
2.4.1 THREE-PHASE 3 -WIRE DELTA NETWORK (
∆∆∆∆∆
)))))
EST
Max 500 VAC (*)
Phase to Phase
L 1
L 2
L 3
Max 500 VAC (*)
Phase to Phase
(*) The 500 VAC limit is imposed by standards.
THREE-PHASE 4-WIRE STAR NETWORK ( )
Y
L 1
L 2
L 3
DEC-3
Max 500 VAC (*)
Phase to Neutral
L 1
L 2
L 3
N
EST
Max 500 VAC (*)
Phase to Neutral
L 1
L 2
L 3
N
DEC-3
(*)
The 500 VAC limit is imposed by standards.
2.5 CURRENT MEASUREMENT CONNECTION
The instruments are equipped with cable holes (one for DEPT and DEC and three for EST and DEC-3) through which the current measurement cables must be fed uninterrupted.
Insert the current cables as shown in Fig. 6 (instructions are also given on the instrument label).
Use cables with max. external diameter of 7 mm.
P1 and P2 in the following diagrams indicate the correct direction of the current.
DEPT / DEC/ DEC-485
P2
P2
EST
P2 P2
DEC3 / DEC3-485
P2
P2 P2
P1
P1 P1 P1
P1 P1 P1
compensation function corrects the inversion, thereby guaranteeing accurate readings.
3 WIRING DIAGRAMS
F
Note:
The following wiring diagrams are applicable to all instruments with serial number (on label on side of instrument) greater than 15000 and used in conjunction with ELEXTOOL software.
In all other cases ( DEC, DEC-3, DEPT-P and EST-P) instruments may only be programmed using the relative Programming dip-switches.
F
Note:
Phases L1-L2-L3 shown in the wiring diagrams need not necessarily correspond with those of the three-phase system.
The voltage and current signal connections must however always correspond.
The wiring diagrams indicate the voltage and current polarities which must be observed.
In the case of inversions the instrument automatically corrects them (except when CO-
GENERATION mode is selected using ELEXTOOL software).
3.1 DEPT AND DEC WIRING DIAGRAMS
L 1
N
P 1
S 1
P 2
S 2
The CT may be connected to both the phase and neutral.
P 2
H I L O W
P 1
The CT may be connected to any of the three phases selected by the user. The phase matching between
voltage and current signals must however always be observed.
I.E. Examples:
I = L1
I = L2
I = L3
V = L2 - L3
V = L3 - L1
V = L1 - L2
L 1
L 2
L 3
P1
S1
P2
S2
P2
L 1
L 2
L 3
+
+
H I L O W
P1
P 1
S 1
P 2
S 2
P 2
H I
L O W
P 1
3.2 EST, DEC-3 and DEC3-485 WIRING
DIAGRAMS
3.2.1 Three-phase 3 -wire delta network (
∆∆∆∆∆
)))))
Figures 10, 11, 12, 13, 14, 14 A, 15, 16 and 17 indicate how to connect the voltage and current signal inputs (
2 or 3 CTs) in an unbalanced three-phase 3-wire delta network (without neutral).
L1
L2
L3 l l l
L1
L2
L3
HI
L1
HI
L2
HI
L3
L1
L2
L3
P1
S1
P2
S2
P1
S1
P2
P2
S2
P1
S1
P2
P2
S2
P2
L1
L2
L3
P1
S1
P2
S2
P1
S1
P2
P2
S2
P1
S1
P2
P2
S2
P2
P1 P1 P1 P1 P1 P1
output as shown in the diagrams below.
L1
L2
L3
P1
S1
EST
P2
S2
P1
S1
P2
S2
P2 P2
DEC-3 e DEC3-485
L1
L2
L3
P1
S1
P2
S2
P1
S1
P2
S2
P2 P2
P1 P1
P1 P1
output as shown in the diagrams below.
L1
L2
L3
EST
P1
S1
P2
S2
P1
S1
P2
S2
P2 P2
L1
L2
L3
DEC-3 e DEC3-485
P1
S1
P2
S2
P1
S1
P2
S2
P2 P2
P1
P1
P1
P1
¦
Connection with 2 CTs in co-generation mode
¦
Connection with 2 CTs (L1 and L2)
Connection with 2 CTs (L1 and L3)
L1
L2
L3
P1
S1
P2
S2
P1
S1
P2
S2
L1
L2
L3
P1
S1
P2
S2
P1
S1
P2
S2
P2 P2
P1 P1
P1
P1
3.2.2 High voltage Three-phase 3 -wire delta network with CT and VT (
∆∆∆∆∆
)))))
L1
L2
L3
L1
L2
L3
For the connection of CTs in medium or high voltage networks, follow the same procedure described for low voltage connections.
3.2.
33
Y Y Y Y Y
Three-phase 4-wire star network ( )
Figures 18 and 19 below indicate how to connect voltage and current signal inputs in an unbalanced three-phase 4-wire star network.
L1
L2
L3
N l l l l
L 1
L 2
L 3
L1
L2
L3
N
HI
L 1
HI
L 2
HI
L 3
L1
L2
L3
N
L1
L2
L3
N
P1
S1
EST
P2
S2
P1
S1
P2
P2
S2
P1
S1
P2
P2
S2
P2
L1
L2
L3
N
DEC-3 e DEC3-485
P1
S1
P2
S2
P1
S1
P2
P2
S2
P1
S1
P2
P2
S2
P2
P1 P1 P1
4 TECHNICAL SPECIFICATIONS
4.1 General Specifications
Voltage: 500 V from 20 to 800 Hz
(1)
Current: 5 A from 20 to 800 Hz
(1) Limit imposed by standards. The measurement Full Scale is 750 VAC.
Voltage: max 800 Vrms, peak 900 Vrms for 1 Sec.
Current: max. 20 Arms, peak 100 Arms for 1 Sec.
2 voltage scales
1 Sec . (DEPT / DEC)
1,5 Sec. (EST / DEC-3) occurs at 110% of the scale activated.
25% of the scale in use).
Length = 105 mm (6 DIN modules)
= 157.5 mm (9 DIN modules)
Height = 90 mm
Depth
= 58 mm
P1 P1 P1
1 0
4 1
5 8 1 05 1 5 7,5
Protection clas s:
Front panel = IP40
-10
°
C to +60
°
C (DEPT / EST)
-10 ° C to +40 ° C (DEC / DEC-3)
200 ÷240 VAC ± 10% 50/60 Hz
100 ÷120 VAC ± 10% 50/60 Hz (on request)
4.2 Display specifications
Sensitivity, Full Scale and accuracy of AC voltage
Range
Rated
150 Vrms
Sensitivity Full
Scale
75 mV*
DEPT / EST
DEC / DEC-3
150 Vrms 0,4% Rdg.+0,1% F.S.
500 Vrms 400 mV 750 Vrms 0,4% Rdg. +0,1% F.S.
Sensitivity, Full Scale and accuracy of AC current
Range
Rated
0,3 A
1,25 A
5 A
Sensitivity Full
Scale
0,15 mA*
DEPT / EST
DEC / DEC-3
0,3 mA 0,4% Rdg.+0,1% F.S.
0,6 mA
3 mA
1,25 A
5,00 A
0,4% Rdg.+0,1% F.S.
0,4% Rdg.+0,1% F.S.
4.3 FORMULAE USED
V
1
RMS
=
240
i
∑
=
1
2
240
I
1
RMS
=
240
∑
( )
i
=
1
I
1
i
2
240
P
1
=
240
∑ i
=
1
V
1 i
×
I
1 i
240
S = V
Q
1
=
S
2
1
−
P
1
2
=
1
V
1
RMS
=
240
i
∑
=
1
2
240
I
1
RMS
=
240
i
∑
=
1
( )
2
240
P
1
=
240
∑
i
=
1
V
1 i
×
I
1 i
240
S
1
=V
1RMS x
I
1RMS
Q
1
=
S
2
1
−
P
1
2
•Three-phase Voltage (
∆∆∆∆∆
)))))
Y Y Y Y Y
•Three-phase Voltage ( )
=
1
V
3
Φ
=
V
12
+
V
23
+
V
31
3
V
3
Φ
=
V
12
+
V
23
+
V
31
3
3
P
3F
=P
1
+P
2
+P
3
Q
3F
=Q
1
+Q
2
+Q
3
S
3
Φ
=
P 2
3
Φ +
Q 2
3
Φ
I
3 Φ
=
S
3 Φ
V
3 Φ
3
(P.F.)
3 Φ
=
P
3
Φ
S
3
Φ
5 TRANSDUCER OPERATION
5.1 EST 4-20 and DEPT 4-20
DEPT 4-20 and EST 4-20 units are electrical parameter transducers with a 4-20 mA output, specially designed for connection to recorders and remote indicators, for process control and regulation and data acquisition systems.
• Measurement selection: Active Power / Reactive Power / Power Factor / Apparent Power
• Connection type selection: Single-phase or Balanced Three-phase (DEPT 4-20) Unbalanced Threephase 4-wire star or 3-wire delta (EST 4-20)
• Voltage Full Scale selection: 65V, 125V, 250V or 500V
• Current Full Scale selection: 1A or 5A
• Integration period selection for average power calculations: instantaneous, 10, 15 or 30 minutes
Functions are easy to program using the 8-pole dip-switch (see Fig. 22) shown in para. 5.1.2.
ON
OFF
1 2 345 678
The dip-switches are protected by a plastic cover mounted on the instrument case. This cover may be removed by inserting a screwdriver in the slot and prising off.
PROGRAM
F
IMPORTANT
Fig. 23 when the instrument is energised will not be accepted. To change program settings power down the instrument and power up again.
Select the required parameters by setting dip-switches 1 and 2 as shown in the diagram below.
The following parameters are available:
Q =
P.F. (Cos
Φ
) =
O N
O F F
1
P
2
O N
Q
1 2
O F F
O N
P.F.
1 2
O F F
S
O N
O F F
1 2
Select the required connection type by setting dip-switch 3 as shown below.
Single-phase
DEPT 4-20
Balanced Three-phase
3 3
O N O N
O FF
O F F
EST 4-20
Three-phase STAR ( )
Three-phase DELTA (
∆
)
3
3
O N
O N
O FF
O FF
Nota
(1) Full Scales are mathematical multiplication factors and do not in any way limit the input voltages and currents.
The Full Scale is the No. used in the instrument F.S. calculation formula.
For example, a 125 V F.S. may be selected for a 400 V input, or alternatively a 1A F.S. for a 5A
CT.
Four voltage Full Scales are available: 65 V, 125 V, 250 V and 500 V. Select the required Full Scale by setting dip-switches 4 and 5 as shown below.
65V (1) 125V (1) 250V (1) 500V (1)
4 5 4 5 4 5 4 5
O N O N O N O N
O F F O F F O F F O F F
Two current Full Scales are available: 1 A and 5 A. Select the required Full Scale by setting dip-switch
6 as shown below.
1 A (1) 5 A (1)
6 6
O N O N
O F F O F F
Power readings may also be calculated as average values over programmable integration periods of 10,
15 or 30 minutes. Select the required integration period by setting dip-switches 7 and 8 as shown below.
O N
O F F
7 8
O N
O F F
7 8
O N
O FF
7 8
O N
O F F
7 8
The instrument is equipped with two screw terminals for the 4-20 mA output. The output connection to recorders, ammeters, remote indicators, etc., must be made using a max. cable size of 4 mm 2 . The output is galvanically isolated with a max. load impedance of 500
Ω
.
The maximum digital to 4-20 mA conversion error is ± 0.2% of the measurement. Connect the instrument taking care to follow the “+” and “-” signs on the label next to the output terminals. The connection procedure is illustrated in Fig. 24 below.
The instrument output supplies a 4 to 20 mA current proportional to the measurement of the selected parameter (dip-switches 1 and 2), voltage Full Scale (dip-switches 4 and 5) and set current (dip-switch
6) for the CT multiplication factor.
DEPT 4-20:
F.S.= Voltage F.S. x Current F.S. x K
Example: V
FS
= 500 V I
FS
= 5 A
CT = 1000/5 K= 200
P
FS
= 500 kW
F.S.=Voltage F.S. x Current F.S. x Ö3 xK
Example: V
FS
= 500 V I
FS
= 5 A
CT = 1000/5 K= 200
P
FS
= 865 kW
EST 4-20:
F.S.= Voltage F.S. x Current F.S. x Ö3 xK
Example:
V
FS
= 500 V I
FS
= 5 A
CT = 1000/5 K= 200
P
FS
= 865 kW
• P.F. Cos
Φ
( Power factor)
5.2 DEPT-P, DEC, EST-P and DEC-3
DEPT-P, DEC, EST-P and DEC-3 units are electrical parameter transducers with a pulse output, specially designed as a PLC or PC interface in automation systems, process control, consumption monitoring, electrical energy cost optimisation and AC/DC load driving applications.
•
Measurement selection:
Active Energy
Apparent Energy
Inductive Reactive Energy
Capacitive Reactive Energy
•
Connection type selection:
Single-phase or balanced Three-phase (DEPT-P and DEC)
Three-phase 4-wire star or 3-wire delta (EST-P and DEC-3)
•
Current Full Scale selection: 1 A or 5 A
•
CT primary rating selection: 14 typical values
Functions are easy to program using the 8-pole dip-switch (see Fig. 25) as shown in para. 5.2.2. Refer to page 25
(Fig. 23) for cover removal instructions.
ON
OFF
1 2 345 678
ON
OFF
1 2 345 678
8-pole dipswitch
DEPT-P
DEC
EST-P
DEC-3
The length of the output pulse varies between 400 and 500 mSecs. (see figure 26 below). Pulse fractions are stored in an internal meter and supplied to the output as a complete pulse each time the meter accumulates a whole one.
4 0 0 -5 0 0 m S e c.
4 00 -50 0 m S ec.
F
IMPORTANT : when the instrument is energised will not be accepted. To change program settings power down the instrument and power up again.
Select the required parameters by setting dip-switches 1 and 2 as shown in the diagram below.
The following parameters are available:
P =
Active Energy/Power
S =
Capacitive Reactive Energy/Power
Inductive Reactive Energy/Power
Apparent Energy/Power
O N
O F F
1
P
2
O N
Q
1 2
O F F
O N
O FF
Q
1 2
O N
O F F
1
S
2
Select the required connection type by setting dip-switch 3 as shown below.
Single-phase
3
O N
O FF
DEPT-P / DEC
Balanced Three-phase
3
O N
O F F
EST-P / DEC-3
Y
Three-phase STAR( ) Three-phase DELTA (
∆
)
3
3
O N
O N
O FF
O FF
Two current Full Scales are available: 1 A and 5 A.
Select the required Full Scale by setting dip-switch 4 as shown below.
O N
1 A
4
O F F
5A
4
O N
O F F
The CT primary current is selected using dip-switches 5, 6, 7 and 8. Refer to the table on page 21 for available CT primary ratings.
It should be noted that the magnitude of the CT primary automatically determines the value of each pulse and hence, the resolution of an associated pulse counter.
A 7-digit electro-mechanical counter is mounted on the front panel of DEC and DEC-3 units to permit direct energy consumption readings (for more information see para. 5.2.4).
Examples:
l
CT= 20/5
Pulse value= 0.1 kWh*
Counter resolution = 999 999.9 kWh * l
CT=200/5
Pulse value= 1 kWh*
Counter resolution = 9 999 999 kWh*
* The instrument provides kWh, kVAh or kvarh readings depending on the parameter selected.
Accurate energy totals are guaranteed even in the case of very small loads.
The instrument's internal floating point mathematics is able to count energy increments down to 10 -4 of the pulse value.
100
250
300
320
400
500
600
750
800
1 KWh
120
150
160
200
240
10
50
60
75
25
30
32
40
80
0,1 KWh
12
15
16
20
24
999 999,9 9 999 999 99 999 990
1000
2500
3000
3200
4000
5000
6000
7500
8000
10 KWh
1200
1500
1600
2000
2400
Dip-switch settings
ON
5-6-7-8
5 6 7 8
OFF
ON
5 6 7 8
OFF
5 6 7 8
ON
OFF
ON
OFF
5 6 7 8
ON
5 6 7 8
OFF
ON
5 6 7 8
OFF
ON
OFF
ON
5 6 7 8
5 6 7 8
OFF
ON
5 6 7 8
OFF
ON
5 6 7 8
OFF
ON
5 6 7 8
OFF
5 6 7 8
ON
OFF
5 6 7 8
ON
OFF
ON
5 6 7 8
OFF
Pulse value
Counter resolution
(KWh)
F
IMPORTANT
Direct measurement of max. 5A loads:
F
IMPORTANT :
Dip-switch settings
(5-6-7-8)
5 6 7 8
O N
O F F
Pulse value
1 pulse = 10 Wh
99 999.99
The pulse output is supplied directly to two screw terminals (Fig. 27) connected to the N.O. voltage-free contacts of an optomos solid state relay rated at 250 Vac/ dc 100 mA.
Connection to pulse counters, PLCs, etc., must be made using cables with max. cross-section of 4 mm
2
.
Pulse output connection terminals (max. cable size 4 mm 2
)))))
Pulse output connection terminals (max. cable size 4 mm 2
)))))
DEC and DEC-3 units feature a non-resettable 7-digit electro-mechanical counter mounted on the front panel.
A set of 9 labels is supplied with these instruments to facilitate pulse counter reading.
You can therefore customise the instrument by choosing the appropriate label for the selected parameter (kWh, kVAh or kvarh) and CT primary range (see Fig. 28) and affixing it to the counter.
Example:
In the example the required label is located in the "kWh" row (selected parameter) and "100-800" column (CT primary range) as shown in Fig. 28.
TA 10 - 80 TA 100 - 800 TA 1000 - 8000
5.3 DEPT-485 and EST-485
DEPT-485 and EST-485 units are electrical parameter transducers with an RS485 interface for network connection to a PC or PLC. Up to 32 instruments can be network-connected over a distance of up to 1000 m. without amplification. The system may be further expanded to a maximum of 247 measuring points using additional line amplifiers. DEPT-485 and EST-485 units are particularly suited for the following applications:
– data acquisition systems for quality control of production processes;
– networks for monitoring electrical energy consumption and the status of components (eg: motors, transformers, etc.);
– maximum demand control and load shedding in combination with PLCs or PC- networked applications for the reduction of energy bills;
– computerised energy cost-accounting and division of electrical energy bills between departments, etc.
Functions are controlled by an RS485 interface using MODICON's MODBUS communication protocol.
l
IIIII
= RMS current
P
= Active Power
P.F.
= Power Factor (Cos
Φ
)
S
= Apparent Power
= Average Active Power
= Average Apparent Power
MD
SS
MD
E
A
E
R
= Maximum Active Power
= Maximum Apparent Power
= Active Energy Consumption (kWh)
= Reactive Energy Consumption (kvarh) l
U = RMS voltage*
IIIII
= RMS current*
P
= Active Power*
P.F.
= Power Factor (Cos
Φ
)
S
= Apparent Power
= Average Active Power
= Average Apparent Power
MD
SS
MD
E
A
E
R
= Maximum Active Power
= Maximum Apparent Power
= Active Energy Consumption (kWh)
= Reactive Energy Consumption (kvarh)
= Frequency
Z
* EST-485 provides both the three-phase and phase measurements of U, I and P values. The threephase voltage is calculated as the average value of the three phase to phase voltages, while the threephase current is the current equivalent to a balanced and symmetrical system (see formulae on page 14).
The average power values are calculated by sliding window mathematics.
Average Apparent Power
Maximum Demand on Active Power
Maximum Demand on Apparent Power
Energy counters
Peak values
The following functions are set using the 8-pole dip-switch illustrated in Fig. 29 below.
2400, 4800 or 9600 BAUD
Single-phase or balanced Three-phase (DEPT-485)
Unbalanced Three-phase 4-wire star or 3-wire delta (EST-485)
ON
OFF
1 2 345 678
F
Measurement paramete rs such as CT and VT values and the instrument's network address must
F
IMPORTANT
made when the instrument is energised will not be accepted. To change program settings power down the instrument and power up again.
Three transmission speeds (2400, 4800 and 9600
BAUD) may be selected using dip-switches 1 and
2.
O N
2400 4800
1 2 1 2
O N
O F F O F F
O N
O F F
9600
1 2
Select the required connection type by setting dip-switch 3 as shown below.
O N
O F F
3
O N
O F F
3
DEPT-485
O N
O F F
3
EST-485
O N
O F F
3
IEEE virgola mobile
4
O N
O F F
O N
O F F
4
Reversed MSB
5
O N
O F F
Normal MSB
5
O N
O F F
Normal MSB
LSB
REG. 1
à
REG. 2
MSB
Reversed MSB
MSB
ß
LSB
REG. 1 REG. 2
F
IMPORTANT
Select the required parity type (EVEN or ODD) by setting dip-switch 7 as shown below.
Select the required parity (PARITY or NO
PARITY) by setting dip-switch 8 as shown below.
O N
Even
7
O F F
Odd
7
O N
O FF
No parity
8
O N
O F F
Parity
8
O N
O FF
Factory setting:
ADDRESS = 27
DATA FORMAT = BCD
BAUD
DATA BIT
STOP BIT
= 4800
= 8
= 2
NO PARITY
DEPT-485 and EST-485 units use a data communication system based on MODBUS protocol.
MODBUS functions and the use of registers are detailed in a special technical document available on request from ELECTREX S.r.l.
The instrument is equipped with three terminals for connection of the output to the RS485 interface
(Fig. 30).
The output connection must be made using a twisted pair.
The instrument is also equipped with a terminal for connection of the shield (sheath) required for network installations in environments prone to heavy interference or strong currents.
Use a twisted pair cable with minimum crosssection of 0.36 mm
2
(22 AWG) and capacity of less than 60 pF/m (ie: BELDEN cable type EIA RS485
- Ref. 3105 A).
If the environment in which the instruments are installed is not prone to interference or strong currents, the connection may be made using an unshielded twisted pair.
Line amplifiers must be used if the distance between the PC and instruments exceeds 1000 m. or if more than 32 instruments are installed.
The PC is equipped with an RS232 interface. A RS232/RS485 converter must therefore be used to connect the twisted pair (the cables are identified by the letters “A” and “B”).
Connect a line termination resistor (R
T
= 100
Ω
- 120
Ω
) between the two twisted pair cables leading from the converter at the end of the network (last instrument connected).
The instruments must be connected to the twisted pair so that the terminals marked “A” (instrument label) are connected to cable “A” (red) and the terminals marked “B” are connected to cable “B” (white) at the output of the RS232/RS485 converter (See Fig. 31).
If the environment in which the instruments are installed is prone to interference or strong currents, the connection must be made using a shielded twisted pair (2x0.25).
Line amplifiers must be used if the distance between the PC and instruments exceeds 1000 m. or if more than 32 instruments are installed.
The PC is equipped with an RS232 interface. A RS232/RS485 converter must therefore be used to connect the twisted pair (the cables are identified by the letters “A” and “B” and the shield by “ ").
Connect a line termination resistor (R
T
= 100
Ω
- 120
Ω
) between the two twisted pair cables leading from the converter at the end of the network (last instrument connected). The shield must be earthed.
The instruments must be connected to the twisted pair so that the terminals marked “A” (instrument label) are connected to cable “A”, the terminals marked “B” are connected to cable “B” and the terminals marked “ " are connected to the shield at the output of the RS232/RS485 converter (see Fig. 32).
RS232
RS232
ð
RS485
INT-485
B
A
1
B A B A
2 max 32 DEPT-485 / EST-485 max 1000 mt
F
If an interface other than INT-485 is installed make sure it is fitted with resistor R ttttt
B A
R t
RS232
INT-485
B
A
1
B
A
2
B
A max 32 DEPT-485 / EST-485 max 1000 mt
B
A
R t
F
If an interface other than INT-485 is installed make sure it is fitted with resistor R ttttt
Examples of a multiple instrument connection: • Example 2: INCORRECT
B A
•
CORRECT
IN T485
B
A
B A
B A
1
B A B A
B
IN T 485
A
B A
2
B A
R t n
IN T 4 85
B
A
B A
B A
B A
B A
B A
B A
The transmission/reception protocol used by the
RS485 interface (MODBUS) permits the creation of data collection systems with up to 247 measurement points. A maximum of 32 instruments can be connected on a common line over a distance of up to 1000 m from the PC. If the number of instruments exceeds 32 or the distance between them and the PC is over 1000 m, line amplifiers must be used to guarantee correct data transmission/ reception (see Fig. 34 below).
5.4 DEC-485 and DEC3-485
The wiring diagrams and output specifications for DEC-485 and DEC3-485 are the same as those specified for DEPT-485 and EST-485 units (see para. 5.3 of this manual).
F
Note: also feature an on-board electro-mechanical counter for kWh totals.
The pulse "weight" value may be modified to satisfy different requirements (ie: 1/10 kWh) by using the
ELEX software version 3.0 or higher.
1
62
5.5 Connection of over 32 instruments (or instruments installed over 1000 m from the PC)
D ATA 0-
1 20 o hm
D A TA 0 +
RS 485 In p u t
SU PP LY
+ v s
G N D
An amplifier must be installed in systems containing more than 32 instruments or when instruments (even if less than 32) are installed over 1000 m from the PC.
The amplifier connection is illustrated in Fig. 35 below.
2
61
63
31
32
247
D ATA 1+
R S485 O u tp ut
1 2 0 o h m
D ATA 1-
220 Va c
FEBRUARY 1999
WARNING :
ELECTREX declines any liability for damages to property or persons due to improper use or misuse of the product.
SUBJECT TO CHANGES WITHOUT PRIOR NOTICE.
MANUAL CODE
Via Claudia, 96
41056 Savignano sul Panaro (MO) Italy
Tel +39 - 59 - 796372
Fax +39 - 59 - 796378
energy with imagination
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Key Features
- Programmable voltage and current full scales
- 4-20 mA, pulse, or RS485 output options
- Single-phase, balanced three-phase, or unbalanced three-phase network support
- Integration period selection for average power calculations
- Advanced auto-compensation technology for measurement reliability
- Modular design for DIN rail mounting
- IEC 1010 and VDE 411 safety standards compliance
