Iskra MI 401 User manual

User's Manual
Measuring Transducer
MI 401

2 User's Manual MI 401

User's Manual MI 401 3
List of contents:
1. CONTAINS OF DELIVERY ________________________________________________________ 4
2. SAFETY ________________________________________________________________________ 4
2.1 EXPLANATION OF SYMBOLS AND LABELS _____________________________________ 4
2.2 WARNINGS, REGULAR INFORMATION AND REMARKS REFERRING TO CE-MARKING4
3. INTRODUCTION _________________________________________________________________ 5
3.1 FEATURES ___________________________________________________________________ 5
3.2 APPLICATION ________________________________________________________________ 5
3.3 LAYOUT AND MODE OF OPERATION ___________________________________________ 6
3.4 PROGRAMMING ______________________________________________________________ 6
3.5 VERSIONS ___________________________________________________________________ 7
3.6 POWER SUPPLY ______________________________________________________________ 7
4. TECHNICAL DATA_______________________________________________________________ 7
4.1 GENERAL____________________________________________________________________ 7
4.2 MEASURING INPUTS__________________________________________________________ 8
4.3 INPUT / OUTPUT MODULES____________________________________________________ 8
4.4 ACCURACY __________________________________________________________________ 9
4.5 POWER SUPPLY _____________________________________________________________ 10
4.6 COMMUNICATION___________________________________________________________ 10
4.7 HOUSING ___________________________________________________________________ 11
4.8 CONNECTION TERMINALS ___________________________________________________ 11
4.9 ENVIRONMENTAL CONDITIONS ______________________________________________ 11
4.10 EU DIRECTIVES CORRESPONDING FOR CE MARKING __________________________ 12
5. MOUNTING ____________________________________________________________________ 12
6. CONNECTION __________________________________________________________________ 12
6.1 CONNECTION TABLE ________________________________________________________ 13
6.2 DIMENSIONAL DRAWINGS ___________________________________________________ 14
6.3 MARKING __________________________________________________________________ 14

4 User's Manual MI 401
1. CONTAINS OF DELIVERY
The delivery contains:
•Measuring transducer MI 401
•User’s manual
2. SAFETY
This Safety Section should be read before
commencing any work on the equipment
•Protection: Protection class II
300 V rms, installation category III
600 V rms, installation category II
pollution degree 2
•Test voltage: 3.7 kV rms
according to EN 61010-1: 1990
The information in the Safety Section of the
product documentation is intended to ensure
that products are properly installed and handled
in order to maintain them in a safe condition. It
is assumed that everyone who will be
associated with the equipment will be familiar
with the contents of the Safety Section.
2.1 EXPLANATION OF SYMBOLS
AND LABELS
The meaning of symbols and labels which may
be used on the equipment or in the product
documentation is given below.
ACaution: refer to product
documentation
.Caution: risk of electric shock
Functional earth terminal
Note: this symbol may also be used for a
protective/safety earth terminal if that terminal
is part of a terminal block or sub-assembly e.g.
power supply.
2.2 WARNINGS, REGULAR
INFORMATION AND REMARKS
REFERRING TO CE-MARKING
In this manual installations and working
instructions for the measuring transducer
MI 401 is to be found. Installation as well as
use of the measuring transducer will involve
working with dangerous currents and voltages.
Professionals must handle these areas. ISKRA
MIS d.d. does not take on responsibility for the
use and installation. If any doubt comes up
concerning the installation or use of the system,
on which the measuring transducer is to be used
for measurement, the person responsible for the
power installation should be contacted.
Measuring transducer MI 401 is CE-marked
according to the LV-directive and EMC-
directive for housing and light industry, which
normally covers the most common use of the
measuring transducer.
Before energising the equipment, the
following should be checked:
•Voltage rating
•Current transformer (CT) circuit rating
and integrity of connections
•Protective fuse rating (the recommended
maximum rating of the external
protective fuse for this equipment is 6A
- Red Spot type or equivalent);
•Integrity of earth connection (where
applicable)

User's Manual MI 401 5
Waste disposal site
Waste electrical and electronic equipment shall
not be handed over to a local waste disposal
company or be disposed of as unsorted
municipal waste. The electrical and electronic
equipment producer or purchaser shall at the
end user's request collect waste electrical and
electronic equipment free of charge provided
the electrical and electronic was put on the
market by it. Waste electrical and electronic
equipment does not fall within the scope of old
waste electrical and electronic equipment load.
The treatment after the expired life shall
comply with provisions of the Directive
2002/96/EC, or Regulations on Management
Treatment of Waste Electrical and Electronic
Equipment (Official Journal of the Republic of
Slovenia No. 118/04).
3. INTRODUCTION
3.1 FEATURES
•Multifunction – more than 50 measured
parameters
(U, I, P, S, Q, PF, Hz, MD, THD, etc)
•Programmable input and output modules
•Low power consumption
•Universal AC/DC power supply
•Typical accuracy: class 0.5
•Serial communication RS232 or RS485
very high speed data rate: up to 115,200
bit/s, (MODBUS protocol)
•Housing for DIN rail mounting
•Max. three input or output modules
•Tariff input (option)
•Pulse output
•Analogue output (option)
3.2 APPLICATION
Programmable measuring transducer MI401
supervises an electrical system. Large input
range allows use of transducer for measuring of
any standard AC current and voltage. It can
generate up to 3 electrically insulated, load
independent analogue output signals (DC
voltage or DC current). The analogue output
signal is proportional to the measured value and
it is appropriate for the control of analogue and
digital devices.
The ease of programmability of transducer is an
important feature in the provision of cost
effective system control. Systems can be easily
changed or expanded as required.
A built-in pulse output is designed for sending
data to the devices for checking and monitoring
consumed energy. Tariff input (Option) is
connected to external tariff switch clock and
can select up to four tariffs.

6 User's Manual MI 401
3.3 LAYOUT AND MODE OF
OPERATION
Current inputs are electrically isolated from the
system by means of measuring transformer B
(Picture 1), voltages are measured by the
resistor voltage divider A. Input signals are
amplified in programmable amplifier D. After
A/D conversion the signal is computed in
microprocessor E. The MI401 uses a true RMS
measurement technique, which provides
accurate measurement. The MI401 extracts 64
samples per cycle and the true RMS
measurement is obtained using these sampled
values. The measured value determined by the
microprocessor is assigned to the three
programmable modules G (analogue or pulse
output or tariff input). Max. of two tariff inputs
are used to select max. of four tariffs.
Communication F enables programming of the
measuring transducer and monitoring of the
following measuring values:
•True RMS AC voltage
•True RMS AC current
•Active / reactive / apparent power
•ϕ, power factor
•Frequency
•THD
•Dynamic demands
•Maximum demands (thermal only)
•Harmonic analysis (optional)
•Active / reactive / apparent energy
Picture 1: Block diagram
3.4 PROGRAMMING
Analogue output modules are programmed1) by
setting software2) via RS232 or RS485
communication. Before setting the transducer,
output value must be selected by the jumpers on
the analogue output3). It is possible to choose
between ranges -1…0…1 V, -10…0…10 V,
-1…0…1 mA, -5…0…5 mA and -
20…0…20 mA.. Within this three ranges it is
possible to set any linear or bent (with
maximum 5 break points) output characteristic.
Pulse rate of output modules can be set by
software via RS232 or RS485 communication.
Tariff inputs are not programmable.
1) – Programming is not possible in versions witho ut communication
2) – Software for setting the transducer is available on the web site of the
company free of charge
3) – Qualified person only

User's Manual MI 401 7
3.5 VERSIONS
The following versions of MI401 transducer are available (Table 1).
Module 4)
Input Frequency
Tariff input Pulse output Analogue
output
Supply Communication Bent characteristic of
analogue output
Universal or
Programmable
500 V 5 A 50 / 60 Hz 0, 1 ali 2
Programmable via
communication
Pulse / Energy
1, 2 ali 3 5)
5 mA
20 mA
10 V
0, 1 or 2 AC
6):
57 V
100 V
230 V
400 V
500 V
RS232 or RS485 Programmable via
communication
Universal or
Pre-configured or
fixed configuration
57.74 V
63.5 V
100 V
110 V
230 V
250 V
400 V
500 V
on request from 50
V to 600 V
1 A
5 A
on request
from
0.5 A to
5 A
50 / 60 Hz
100 V/√3
110 V/√3
230 V
To be specified at t he
placing order
5 mA
10 mA
20 mA
4...20 mA
10 V
other on
request
AC6):
57 V
100 V
230 V
400 V
500 V
RS232 or RS485 To be specified at the
placing order
Table 1: Versions of MI401
4) – Type of input or output should be specified for each module
5) – Auxiliary AC power supply is possible only with versions with one pulse output module
6) – MI401 has min. 1 pulse output module
3.6 POWER SUPPLY
Default power supply for MI401 is universal
AC/DC aux power supply. For MI401 with 1
pulse output module AC aux. Power supply can
be made on request (Page 10, “Table 3:
Nominal AC voltages for auxiliary power
supply”).
Caution! Transducers with universal and AC
only auxiliary power supply can have only one
input / output module.
For voltages up to 300 V installation category
III, for voltages from 300 V to 600 V
installation category II – see chapter
Regulations
4. TECHNICAL DATA
4.1 GENERAL
•Measured principle:
True RMS value measurement,
Microprocessor sampling

8 User's Manual MI 401
4.2 MEASURING INPUTS
•Nominal input voltage: 50 to 500 V
(phase to neutral)
•Nominal input current: 0.5 to 5 A
•Nominal frequency fn: 50/60 Hz
•Frequency range: 45…65 Hz
•Consumption [VA]:
Voltage circuit: U2/ 3 MΩ
with external power supply current circuit:
≤I2• 0.01 Ω
•Overload capacity:
according to SIST EN 60688: 1995
A1: 2001, A2: 2002
Input
value
Number of
applications
Duration
of one
application
Interval
between two
successive
applications
Current circuit
2 x
In ⎯continuously ⎯
20 x
In 5 1 s 300 s
Voltage circuit
1.5 x
Un 7) ⎯continuously ⎯
2 x
Un 7) 10 1 s 100 s
Table 2: Overload capacity
7)– For aux power supply see page 7 under “Power supply - nominal values”
4.3 INPUT / OUTPUT MODULES
•Min. no. of input / output modules
1 pulse output
•Max. no. of input / output modules 3
4.3.1 Programmable DC current output:
•Output IOutN (out. range end value):
Output range values 8)
–100…0…100%
(-1…0…1 mA) to –20…0…20 mA
•Burden voltage: 15 V
•External resistance:
RBmax.[kΩ]=
[mA
]
I
V15
OutN
•Max. no. of current output modules 2
8) - Depends of set jumpers on output module
Programmable DC voltage output:
•Output UOutN (out. range end value):
Output range values –100…0…100%
-1…0…1 V do –10…0…10 V
•Burden current: 20 mA
•External resistance:
RBmin.[kΩ]=
mA20
[V]UOutN
•Max. no. of current output modules 2
General:
•Response time: < 300 ms
•Residual ripple: < 1 % p.p.
The outputs 1 and 2 may be either short or
open-circuited. They are electrically insulated
from each other and from all other circuits
(floating).
All the output range end values can be reduced
subsequently using the programming software,
but a supplementary error results.
4.3.2 Programmable (with MiSet software)
pulse output:
•Setting: energy per pulse
•Time period (pulse and pause):
2…510 ms
•Time period step: 2 ms
•Maximum current output: 27 mA
•Maximum voltage output: 40 V
•Max. no. of pulse outputs 3
•Default value:
Max. decade value in regards to
measuring parameters

User's Manual MI 401 9
4.3.3 Tariff input:
•Nominal voltage Un: 230 V
100 V/√3
110 V/√3
•Supply voltage range: 0.8…1.15 Un
•Current at nominal voltage: <0.5 mA
•Max. tariff inputs: 2
4.4 ACCURACY
Reference value:
•Reference value: Output range end
value
Analogue outputs accuracy class 9)
(according to SIST EN 60688):
•RMS current:
Phase current I1, I2, I3and average
current Iavg 0.5 c
Neutral current In 1 c
•RMS voltage:
Phase to neutral voltages U1, U2, U3
and average phase to neutral voltage
Uavg(pn) 0.5 c
Phase to phase voltages U1-U2, U2-U3,
U3-U1and average phase to phase
voltage Uavg(pp) 1 c
•System frequency: 0.2 c
Input frequency range ≤10 Hz 0.1 c
•System:
Active, reactive and apparent power0.5 c
•Phase:
Active, reactive and apparent power0.5 c
Power factor:
Input range 50 mA…6 A, 10…600 V
0.2 ±0.5° c
•Angle:
angle between phase U and I and
power angle total ±0.2° c
•Dynamic demand values 10):
Phase current (I1, I2or I3), apparent
power total(St) active power total (Pt)
(positive or negative) reactive power
total (Qt) (L or C) 1 c
•Maximum demand values 9):
Phase current (I1, I2or I3), apparent
power total (St) active power total (Pt)
(positive or negative) reactive power
total (Qt) (L or C) 1 c
9) – To calculate intrinsic error, see chapter intrinsic-error (for analogue
outputs) on this page.
10) – If power supply is disconnected or interrupted (t > 1 s), the data will be
lost.
Pulse output accuracy class
(according to SIST EN 61036: 1998, A1:2001
and SIST EN 61268:1997):
•Active energy Class 1
•Reactive energy Class 2
•Apparent energy Class 2
•
Communication accuracy class:
All quantities that are available in analogue
output have the same accuracy as previous,
except frequency.
•Frequency: ±10 mHz
•Angle between phase voltages:
(ϕ12, ϕ23, ϕ31) ±0.2°
•THD:
All THD (U1, U2, U3,
U12, U23, U31, I1, I2, I3) 1
Reference conditions:
•Ambient temperature: 0…45 °C
•Input: 0…100 % Un
(connected to the measuring transformer)
0…100 % In
•Active/reactive factor:
cosϕ= 1 / sinϕ= 1
•Waveform:
Sinusoidal, form factor 1.1107
Intrinsic-error (for analogue outputs):
For intrinsic-error for analogue outputs with
bent or linear-zoom characteristic multiply
accuracy class with correction factor (c).
Correction factor c (the highest value applies):
Linear characteristic

10 User's Manual MI 401
e
e
x
x
y
y
c0
0
1
1
−
−
=
or 1
=
c
Bent characteristic
bb xxx ≤≤−1b– number of break
point (1 to 5)
e
e
bb
bb
y
x
xx yy
c⋅
−
−
=
−
−
1
1or 1
=
c
Picture 2: Examples of settings with linear and
bent characteristic
4.5 POWER SUPPLY
Auxiliary AC/DC voltage (universal):
•Nominal voltage (Un): 24…300 V DC
40…276 V AC
•Frequency range: DC or 40…70 Hz
•Supply burden: < 5 VA
Auxiliary AC voltage:
Auxiliary voltage supply
(Un)
Nominal operating
range
57,74 V
63,5 V
100 V
110 V
230 V
400 V 11)
500 V 11)
80…120 % Un
Table 3: Nominal AC voltage for Auxiliary
power supply
11) – To 300 V installation category III, from 300 to 600 V installation category
II – see chapter Regulations.
•Frequency range: 45…65 Hz
•Supply burden: < 5 VA
4.6 COMMUNICATION
RS232
•Connection type: Point to point
•Signal levels: RS232
•Maximum cable length: 15 m
•Connector: Screw terminals
•Isolation: 3.7 kV rms for 1 minute
between all terminals and all other circuits
except between communication terminals
and output terminals, 2 kV rms for 1 minute
•Transmission mode: Asynchronous
•Message format: MODBUS RTU
•Data rate: 1,200 to 115,200 bits/s
•RS232 connections

User's Manual MI 401 11
MI 401 9 pin D
connector (PC) 25 pin D connector (PC)
Rx (21) Rx (3) Rx (2)
 (22) GND (5) GND (7)
Tx (23) Tx (2) Tx (3)
Table 4: RS232 connections
RS485
•Connection type: Multi-drop
(32 connections per link)
•Signal levels: RS485
•Cable type: Screened twisted pair
•Maximum cable length: 1000 m
•Connector: Screw terminals
•Isolation: 3.7 kV rms for 1 minute
between all terminals and all other circuits
except between communication terminals
and output terminals, 2 kV rms for 1 minute
•Transmission mode: Asynchronous
•Message format: MODBUS RTU
•Data rate: 1,200 to 115,200 bits/s
•RS485 connections
MI 401 RS485
A (21) DATA - A
C (22) NC 12)
B (23) DATA - B
Table 5: RS485 connections
12) – NC – do not connect
4.7 HOUSING
•Material of housing: PC/ABS
non-flammable, according to UL 94 V-0
•Mounting:
For rail mounting, 35 x 15 mm
according to SIST EN 60715
•Enclosure protection: IP 50
(IP 20 for connection terminals)
according to SIST EN 60529: 1997, A1: 2000
•Weight including packing:
with AC power supply, 0.445 kg
with AC power suply and communication
0.586 kg
with universal power supply, 0.453 kg
4.8 CONNECTION TERMINALS
•Permissible cross section of the
connection leads:
≤4.0 mm2single wire
2 x 2.5 mm2fine wire
•Small cross-section cables shall be
equipped with cable conduit. The
minimum conduit diameter required
amounts of 0.14 mm2.
4.9 ENVIRONMENTAL
CONDITIONS
•Climatic rating: Usage group 2
according to SIST EN 60688: 1992
•Nominal range of use 0 to +45 °C
•Storage temperature -40 to +70 °C
•Annual mean relative humidity:
≤93% r.h.

12 User's Manual MI 401
4.10 EU DIRECTIVES
CORRESPONDING FOR CE
MARKING
Low voltage directive 73/23/EEC: SIST EN
61010-1: 1993 and SIST EN 61010-1: 2002
Safety requirements for electrical equipment for
measurement, control, and laboratory use, Part
1: General requirements
EMC directive 89/336/EEC: SIST EN 61326-
1: 1997 Electrical equipment for measurement,
control, and laboratory use EMC requirements,
Part 1: General requirements.
5. MOUNTING
MI 401 is appropriate for rail mounting
according to SIST EN 60715
On picture below you can see rail mounting
Picture 3: Rail mounting of the transducer
6. CONNECTION
Transducer’s voltage inputs can be connected
directly to the low-voltage network, or to the
high-voltage network via high-voltage
transformer.
Transducer’s current inputs can be connected to
the low-voltage network via current transformer
or to the high-voltage network via high-voltage
current transformer.
Picture 4: Single phase system (1b)
Picture 5: Three phase system
(three wire balanced - 3b)
Picture 6: Three phase system
(three wire unbalanced - 3u)
Picture 7: Three phase system
(four wire balanced - 4b)

User's Manual MI 401 13
Picture 8: Three phase system
(four wire unbalanced - 4u)
6.1 CONNECTION TABLE
Table 6: Connections
13) – See technical data on page 5
14) – NC do not connect
Function Connect ion
IL1 1/3
IL2 4/6
AC current
IL3 7/9
UL1 2
UL2 5
UL3 8
Measuring input:
AC voltage
N 11
Tariff input Pulse output13) Analogue
output
DC C+ 15
Module 1
DC C16
DC C+ 17
Module 2
DC C18
DC C+ 19
Inputs / outputs:
Module 3
DC C20
+ / AC 13
Auxiliary power supply:
- / AC 14
Rx / A 21
/ NC 14)22
Communication: RS232 / RS485
Tx / B 23

14 User's Manual MI 401
6.2 DIMENSIONAL DRAWINGS
Picture 9: Dimensional drawing (all
dimensions are in mm)
6.3 MARKING
Measuring transducers with linear characteristic
on all three modules have one label at the front
of the housing (Picture 10):
2:  :40 V max / 27 mA max
3 : T1/T2:230 V AC + 10/ -15%
1: P tot :0...3 kW;0. ..10 mA; |0, 5|
+ /  + / 

Picture 10: Example of label for transducer
with linear characteristic
Measuring transducers with bent characteristic
on at least one module have one label at the
front of the housing and additional label at the
top of the housing. On additional label
characteristics of non-linear outputs are define
(Picture 11):
2: :-180°...+180°; 0...10 V; See note! ϕ average
3 : f: 45...55 Hz; 0...20 mA; See note!
1: P tot :0...3 kW;0...1 0 mA; |0,5|
+ /  + / 
Break
point
Break
point
Start
point
Start
point
Measured
value[Hz]
Measured
value [°]
Output
value[V]
 Output
value[mA]

1
2
3
4
5
End
point
1
2
3
4
5
End
point
Output3; f 0,2% ± Output2; 0,2° ϕ± avg
-180 10
00
045
48 2
52 18
[phone]
--
--
--
--
-
-
-
-
-
-
Picture 11: Example of label for transducer
with bent characteristic on modules 2 and 3

Printed in Slovenia
•
Subject to change without notice •Version 01 / avg. 2006