Janitza UMG 96-PA User guide

Power Quality Analyzer
UMG 96-PA
User Manual and Technical Data
Doc. no. 2.061.015.1b 07/2018
www.janitza.com
Janitza electronics GmbH Vor dem Polstück 6 D-35633 Lahnau Support phone number +49 6441 9642-22 Fax +49 6441 9642-30 E-mail: info@janitza.com Internet: http://www.janitza.com
UMG 96-PA www.janitza.de
Content
1. General 6
1. 1 Disclaimer 6
1. 2 Copyright notice 6
1. 3 Technical modifications 6
1. 4 Declaration of Conformity 6
1. 5 Comments on the Manual 6
2. Safety 8
2. 1 Safety Instructions 8
2. 2 Safety Measures 9
2. 3 Qualified Staff 9
3. Intended Use 10
3. 1 Input Check 10
3. 2 Intended Use 10
3. 3 Delivery Contents 11
3. 4 Deliverable accessories 11
4. Product Description 12
4. 1 Measurement Procedure 12
4. 2 Operating Design 12
4. 3 Network Analysis Software GridVis® 12
4. 4 Performance characteristics 13
4. 5 Product Overview 14
5. Installation 16
5. 1 Installation site 16
5. 2 Installation position 16
5. 3 Securing the device 16
6. Network systems 17
6. 1 Voltage measurement 18
6. 2 Rated voltages 19
6. 2. 1 Three-phase 4-wire network with earthed neutral conductor 19
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7. Installation 20
7. 1 Connection to a PC 20
7. 2 Circuit breaker 21
7. 3 Supply voltage 21
7. 4 Measured voltage 22
7. 4. 1 Overvoltage 22
7. 4. 2 Frequency 22
7. 4. 3 Connection variants for voltage measurement 24
7. 5 Current measurement 24
7. 5. 1 Current measurement connection variants 25
7. 5. 2 Direction of the current 26
7. 5. 3 Total current measurement 26
7. 5. 4 Ammeter 26
8. Interface 27
8. 1 Screening 27
8. 2 Termination resistors 28
8. 3 Bus structure 29
9. Digital inputs and outputs 30
9. 1 Digital inputs 30
9. 1. 1 S0 pulse input 31
9. 2 Digital outputs 31
9. 3 LED status bar 32
10. Analog output 33
11. Operation 34
11. 1 Key assignment 34
11. 2 Measurement value display "Overview" 34
11. 3 Option menu 34
11. 4 Overview of menu displays 35
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12. Configuration 36
12. 1 Language 36
12. 2 Communication 36
12. 3 Measurement 37
12. 3. 1 Rated current 37
12. 3. 2 Current and voltage transformers / Nominal current 39
12. 4 System 40
12. 4. 1 Firmware / Serial number 40
12. 4. 2 Time 40
12. 4. 3 Password 40
12. 4. 4 Reset 41
12. 5 Display 43
12. 6 Colors 44
12. 5. 1 Brightness 44
12. 5. 2 Standby 44
12. 5. 3 Brightness (standby) 44
13. Putting the device into service 45
13. 1 Supply voltage 45
13. 2 Measured voltage 45
13. 3 Frequency measurement 46
13. 4 Rotary field direction 46
13. 4. 1 Phasor diagram basics 47
13. 5 Measurement current 48
13. 6 Measurement range violation 49
13. 7 Checking the power measurement 49
13. 8 Checking communication 50
13. 9 Delete min./max. values individually 50
13. 10 Harmonics 51
13. 11 Communication in the bus system 52
13. 11. 1 RS485 52
13. 12 Digital inputs/outputs 53
13. 12. 1 Digital inputs 53
13. 12. 2 Digital outputs 55
13. 13 Analog output 60
13. 14 “Drag indicator” function 61
13. 14. 1 Internal synchronization 61
13. 14. 2 External synchronization 62
13. 14. 3 Synchronization priority 64
13. 15 Recordings 65
13. 16 Tariff switching 66
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14. Overview of measurement value displays 68
15. Service and maintenance 74
15. 1 Repairs 74
15. 2 Front film 74
15. 3 Disposal 74
15. 4 Service 74
15. 5 Device calibration 74
15. 6 Re-calibration 74
15. 7 Firmware update 74
15. 8 Battery 75
15. 9 Procedure in the event of an error 76
16. Technical Data 77
16. 1 Function performance characteristics 80
16. 2 Modbus address list of frequently used measurement values: 82
16. 3 Number formats 83
16. 4 Dimension views 84
16. 5 Connection example 1 85
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UMG 96-PA www.janitza.de

1. General

1. 1 Disclaimer

Compliance with the information products for the devices is a precondition for the safe operation and for achieving the stated perfor­mance and product characteristics. Janitza electronics GmbH does not accept any liability for personal injury, material damage or financial loss incurred as a result of not complying with the information products. Ensure that your information products are kept easily accessible to read.

1. 2 Copyright notice

© 2017 - Janitza electronics GmbH - Lahnau. All rights reserved. Any duplication, editing, distribution or other unauthorized utilization in whole or in part is prohibited. All trademarks and their corresponding rights are the property of the respective owners of those rights.
1. 3 Technical modifications

1. 5 Comments on the Manual

We welcome your comments. If anything in this manual seems unclear to you, please let us know by sending an e-mail to:
info@janitza.de
• Ensure that your device corresponds to the installation guide.
• First, read and understand the documents included with the product.
• Keep the product documents available for the entire life cycle of the product and provide them to any subsequent users.
• Learn about device revisions and the cor­responding updates to the product docu­mentation at www.janitza.de.

1. 4 Declaration of Conformity

The laws, norms and guidelines applied by Janitza electronics GmbH in the production of this product can be found in the declara­tion of conformity at www.janitza.de.
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UMG 96-PA www.janitza.de

2. Safety

Please read this user manual as well as all other publications that must be referred to for working with this product. This applies especially to installation, operation and main­tenance.
Please follow all safety instructions and warn­ings. Not following the instructions may result in personal injury or damage to the product.
Any unauthorized modifications to or use of this device that exceeds its stated mechan­ical, electric or other operational limits may result in personal injury or damage to the product.
Any such unauthorized modification consti­tutes "misuse" and/or "negligence" in the meaning of the warranty for this product, and therefore invalidates the warranty for the coverage of possible damages occurring as a result.
The User Manual:

2. 1 Safety Instructions

Symbols used:
As an addition to the safety in-
c
C
Safety instructions are marked with a warning triangle and depicted as follows depending on the degree of hazard:
m
HAZARD!
structions, this symbol indicates an electrical hazard.
Together with the word "Instruc­tions," this symbol describes:
• Procedures that do not entail any risk of injury.
• Important information, proce­dures or actions.
Indicates an immediate hazard that results in serious or fatal injury.
• Read before operating the device.
• Keep available for the entire life cycle of the product and for reference.
Comply with the legal and safety guidelines required additionally for the specific instance of application when using the device.
m
WARNING!
m
CAUTION!
Indicates a possibly hazardous situation that may result in seri­ous or fatal injury.
Indicates a possibly hazardous situation that may result in mi­nor injury or material damage.
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2. 2 Safety Measures

When electrical devices are in operation, certain parts of these devices are necessar­ily subject to dangerous levels of voltage. Serious bodily harm or material damage may therefore result if they are not handled properly:
c
WARNING!
Serious bodily harm or death may result from hazardous voltages.
For this reason, please note the follow­ing:
Before making connections, ground the device on the protective earth ter­minal, if available.
Hazardous voltages can occur in any of the circuits connected to the volt­age supply.
There may be hazardous voltages in­side the device even after disconnect­ing the voltage supply.
Outfit single-wire leads with ferrules.
Only connect screw terminals with the
same number of poles that are of the same make.
Before starting to work, de-energize the system.
Risk of injury from electric
voltage!
2. 3 Qualified Staff
This device is to be operated and maintained only by qualified staff.
Qualified staff are people who are able to recognize risks and avoid possible hazards that the operation or maintenance of the device may cause, based on their specialized training and their experience.
c
WARNING!
If the device is not operated in accordance with the documentation, safety is no longer ensured and the device may pose a risk.
Risk of Injury from
Improper Use
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3. Intended Use

3. 1 Input Check

Proper transport and professional storage, installation and assembly, as well as careful control and maintenance, are all precondi­tions for the proper and safe operation of this device.
Perform unpacking and packing with the usu­al care and without the use of force, and only use suitable tools.
Perform a visual inspection of the devices to ensure a proper mechanical condition.
Check the delivery contents for complete­ness before starting to install the device.
If it is to be assumed that safe operation is no longer possible, the device is to be placed out of order immediately and pro­tected against unintended operation. It is to be assumed that safe operation is no longer possible if the device e.g.:

3. 2 Intended Use

The device is:
• intended to be built into control cabinets and small distribution boards.
• not intended to be built into vehicles! The use of the device in mobile equipment is considered an exceptional environment condition, and is only admissible with a separate agreement.
• not intended to be built into environments with hazardous oils, acids, gases, fumes, dust, radiation, etc.
C
ATTENTION!
All of the screw terminals included in the delivery contents are connected to the device.
• shows visible signs of damage,
• no longer functions despite an intact pow­er supply,
• has been exposed to longer periods of adverse conditions (e.g. storage not con­sistent with the admissible climate limits without an adjustment of the room climate, thawing, etc.) or transport stresses (e.g. fall from a great height even without any outward visible signs of damage, etc.).
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ATTENTION!
All of the delivered options and design variants are described on the delivery note.
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3. 3 Delivery Contents

Number Art. no. Name
1 52.32.xxx
1)
UMG 96-PA
1 33.03.360 Installation Guide
1 33.03.361 "GridVis Software" Quick Start Guide
1 10.01.896 Screw terminal, pluggable, 3-pole (auxiliary energy)
1 10.01.849 Screw terminal, pluggable, 4-pole (voltage measurement)
1 10.01.871 Screw terminal, pluggable, 6-pole (current measurement)
1 10.01.909 Screw terminal, pluggable, 3-pole (RS 485)
1 10.01.865
Screw terminal, pluggable, 10-pole (digital inputs/outputs, analog output)
1 52.22.251 Mounting Kit
1)
See delivery note for item number

3. 4 Deliverable accessories

Item no. Name
21.01.058
Lithium battery CR2032, 3 V (Authorization as per UL 1642)
29.01.065 Seal, 96 x 96
15.06.015 Interface converter RS485 <-> RS232
15.06.025 Interface converter RS485 <-> USB
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UMG 96-PA www.janitza.de

4. Product Description

The device is intended for:
• the measurement and calculation of elec­trical quantities such as voltage, current, power, energy, harmonics in the building installation, on distributors, circuit breakers and busbar distributors.
• the measurement of measuring voltag­es and currents originating in the same network.
• measurements in low-voltage networks in which rating voltages of up to 600 V conductor to ground and surges of over­voltage category III may occur.
• Measurement in medium and high-voltage networks usually does not occur through current or voltage transformers.
• being built into non-mobile control cab­inets or small distribution boards. The position at which it is built in is arbitrary.
• measurement in medium- and high-voltage networks with current and voltage trans­formers.
• use in domestic and industrial settings.
• the measurement of current via external ../1 A or ../5 A current transformers.
Directly on the device using the 6 keys and the display.
• Via the programming software GridVis®.
• You can change and open data with the help of the Modbus address list via the Modbus protocol. You can find this list at www.janitza.de.
This user manual only describes the 6-key operation of the device. The network analysis software GridVis® has its own "Online Help Guide."

4. 3 Network Analysis Software GridVis®

You can program the device and read out the data with the network analysis software Grid­Vis® available at www.janitza.de. To do this, a PC must be connected to the device e.g. via a serial interface (RS485) or via a gateway connection.
With the network analysis software GridVis®, you can:
The measurement results can be displayed and read out via the device interface for fur­ther processing.

4. 1 Measurement Procedure

The device:
• continuously measures and calculates all effective values over a 200 ms interval.
• measures the real effective value (TRMS) of the voltages and currents connected to the measurement inputs.

4. 2 Operating Design

You can program the device in many ways and/or recall measurement values.
• program the device.
• configure and read out recordings.
• analyze the data you read out.
• save data in the database.
• display measurement values graphically.
• program client-specific applications.
Malfunction can result
c
CAUTION!
If the device is connected improperly, it may deliver measurement values with errors.
For this reason, please note the follow­ing:
Measurement voltages and measure­ment currents must come from the same network.
Do not use the device to measure direct current.
Earth the conducting patch boards.
from an improper
connection
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4. 4 Performance characteristics

General
• Front board installation device measuring 96 x 96 mm
• Expansion by modules
• Connection via plug-in terminals with screw connections
• Color graphics display 320 x 240 px
• Control via 6 keys
• 3 voltage measurement inputs (600 V, CAT III)
• 3 current measurement inputs (via current transformer)
• 3 digital outputs
• 3 digital inputs (configured as impulse counters with simultaneous power calculation
• 1 analog output (0 - 20 mA)
• Data storage 4 MByte Flash
• RS485 interface (Modbus RTU, Slave, up to 115 kbps)
• Recording of more than 2,000 measurement values
• Clock and battery
• Operating temperature range -10 °C .. +55 °C
Measurement uncertainty
• Active energy, measurement uncertainty class 0.5S for ../5A transformers
• Active energy, measurement uncertainty class 1 for ../1A transformers
• Reactive energy class 1
Measurement
• Recording of more than 800 measurement values
• Measurement in TN and TT networks
• Measurement in networks with rated voltages of up to L-L 720 Vrms and L-N 417 Vrms (as per IEC)
• Measurement range for current 0.005 .. 6 Arms
• Real active value measurement (TRMS)
• continuous sampling of voltage and current measurement inputs
• Frequency range of the fundamental oscillation 45 Hz .. 65 Hz
• Measurement of the harmonics 1 to 25 for ULN and I
• ULN, ULL, I, P (drawn/delivered), Q (ind./cap.)
• 2 tariffs (switching via Modbus or digital input 1)
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UMG 96-PA www.janitza.de

4. 5 Product Overview

1
2
Fig. Front view of UMG 96-PA
3 4
5
8 7
6
1 Device Type 2 Description of the function keys 3 Key 1: Configuration menu, Back (ESC) 4 Key 2: Select digit, set option field () 5 Key 3: Lower digit by 1, select menu item (), set option field () 6 Key 4: Increase digit by 1, select menu item (), set option field () 7 Key 5: Select digit, set option field () 8 Key 6: Open option menu, activate entry, confirm selection (Enter)
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1
8
Fig. Back view of UMG 96-PA
2
3 4 5
6
7
1 Supply voltage 2 RS485 interface 3 Digital inputs 4 Digital outputs 5 Analog output 6 Module connector 7 Current measurement inputs I1 to I3 8 Voltage measurement inputs V1 to V3
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5. Installation

5. 1 Installation site

The device is suitable for installation in non-mobile and weather-protected control panels in indoor environments.
Plan on an earth for conducting control pan­els.
Material damage may
m
CAUTION!
result if the installation in-
structions are not followed!
Not following the installation instructions may damage or destroy your device.
Comply with the details on the installation position in sections „Installation“ and „Technical Data“.

5. 2 Installation position

The cut-out dimensions of the control panel are 92
+0,8
mm x 92
+0,8
mm.
To achieve sufficient ventilation, take the following measures:
• Install the device vertically.
• Maintain a minimum clearance of 50 mm above and below.
• Maintain a minimum clearance of 20 mm on each side.

5. 3 Securing the device

The device is secured in the control panel with the side mounting brackets. The brack­ets are to be removed e.g. using a screw­driver as a horizontal level before the device is put in.
Fig. Side view of UMG 96-PA with mounting brackets. The brackets can be loosened by leveraging them hori­zontally with a screwdriver.
Then slide in and snap the brackets into place, and finally screw in the screws to se­cure the device.
• Turn the clamping screws until they just touch the assembly plate.
• Then tighten the clamping screws with two more rotations each (the mounting brack­ets may be destroyed if the screws are tightened too much).
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Fig. Back view of the installation posi-
tion of the UMG 96-PA
Assembly plate
Mounting brackets
Clamping screw
Once the clamping screws touch the surface of the assembly plate: use two further rotations at most to secure the device
Screwdriver
www.janitza.de UMG 96-PA
L1
E
L1 L2
L3 E
N
R
L1
L2 L3 EE
L1
L2 L3 EE

6. Network systems

Network systems and maximum rated voltages as per DIN EN 61010-1/A1:
Three-phase four-wire systems
with earthed neutral conductor
L2
N
L3
IEC U
UL U
L-N
L-N
/ U
417 VLN / 720 VLL
L-L:
/ U
347 VLN / 600 VLL
L-L:
EE
The device can be used in
• TN and TT networks
• domestic and industrial areas.
c
WARNING!
Risk of injury from
electric voltage!
If the device is exposed to measurement voltage surges above the admissible over­voltage category, safety-related insulations in the device may be damaged, whereupon the safety of the product can no longer be guaranteed.
Only use the device in environments in which the admissible measurement surge voltage is not exceeded.
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6. 1 Voltage measurement

You can use the UMG 96-PA to measure volt­age in TN and TT systems. Voltage measurement in the UMG 96-PA is designed for the overvoltage category 600V CATIII (measurement surge voltage 6 kV).
347V/600V 50/60Hz
L1
L2
L3
N
PE
L1
240V 50/60Hz
N
In systems without N, the measurement val­ues that require an N are based on a calcu­lated N.
c
WARNING!
Risk of injury from electric
voltage!
If voltage transformers are used, the con­nections on the secondary side may not be short-circuited!
For this reason, please note the follow­ing:
Check that the voltage transformers have been prop­erly installed. To do this, read the re­spective information about the voltage transformers.
V1 V3V2 VN
AC/DC
4M
4M
4M
Voltage measurement
UMG 96-PA
Fig. Principle circuit diagram - Measurement in three-
phase 4-wire systems.
4M
Auxiliary energy
DC
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6. 2 Rated voltages

The following figures show lists of the net­works and the corresponding network rated voltages at which the device can be used.

6. 2. 1 Three-phase 4-wire network with earthed neutral conductor

U
/ U
L-N
L-L
66V / 115V 120V / 208V 127V / 220V 220V / 380V 230V / 400V 240V / 415V 260V / 440V 277V / 480V 347V / 600V 400V / 690V 417V / 720V
Maximum network voltage of the network as per UL
Maximum network voltage of the network
Fig. Network rated voltages as per EN 60664-1:2003
suited for measurement inputs
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7. Installation

7. 1 Connection to a PC

There are various options for connecting the device to a PC:
1. Connection via an interface converter:
PC with GridVis®
UMG 96-PA
RS232
RS232
RS485
RS485
PC with GridVis®
UMG 96-PA
USB
USB
RS485
RS485
2. Use of the UMG 96-PA (slave) via a UMG (master) with gateway functionality (e.g. UMG 512)
PC with GridVis®
Ethernet
Ethernet
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UMG 512-PRO
as gateway
UMG 96-PA
Slave 1
ModbusModbus Modbus
UMG 96-PA
Slave 2
UMG 103
Slave 3
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7. 2 Circuit breaker

For building installation, plan for a suitable circuit breaker for the supply voltage to de-energise the device.
• The circuit breaker must be installed near the device and easily accessible to the user.
• The switch must be marked as the circuit breaker for this device.

7. 3 Supply voltage

The device needs a supply voltage to oper­ate. The type and amount of supply voltage required for your device can be found on the ratings plate.
The supply voltage is connected on the rear of the device via terminal blocks.
Before connecting the supply voltage, ensure that the voltage and frequency correspond to the details on the ratings plate.
Connect the supply voltage through a UL/IEC approved fuse.
After the supply voltage has been connect­ed, an indicator will appear on the display. If no indicator appears, check that the supply voltage is within the rated voltage range.
m
CAUTION!
result from failure to com-
ply with the connection
requirements.
Noncompliance with the connection re­quirements may result in your device being damaged or destroyed.
For this reason, please note the following:
Comply with the details on voltage and frequency on the ratings plate.
Connect the supply voltage through a fuse in accordance with the technical specifications.
Do not source the supply voltage on the voltage transformers.
Plan for a fuse for the neutral conduc­tor if the neutral conductor connection to the source is not earthed.
L
N
PE/FE
1.)
Material damage may
1.)
2.)
Fuse
(UL/IEC listed)
2.)
Disconnector
(Circuit breaker)
Functional earth
c
WARNING!
Risk of injury from electric
voltage!
Serious bodily harm or death may result from:
• Touching bare or stripped wires that are live.
• Inputs on the device that are dangerous to touch.
For this reason, please note the following:
The inputs for supply voltage are dangerous to touch.
De-energise your system before starting work!
Fig. Connection example for supply voltage
ATTENTION!
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If the functional earth is not connected, the device displays a non-applied residual voltage.
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Overcurrent protective device for the line protection of the supply voltage
Recommendation for the overcurrent pro­tective device for the line protection of the supply voltage, depending on the variants:
• Option 230 V: 6 - 16 A (Char. B)
• Option 24 V: 1 - 6 A (Char. B)
C
Recommendation for the maximum number of devices on one miniature circuit breaker, depending on the variants:
• Option 230 V:
• Option 24 V:
ATTENTION!
The circuit breaker serves only as line protection - it does not provide protection for the device!
For one miniature circuit breaker B6A, maximum of 4 devices. For one miniature circuit breaker B16A, maximum of 11 devices.
For one miniature circuit breaker B6A, maximum of 3 devices. For one miniature circuit breaker B16A, maximum of 9 devices.

7. 4 Measured voltage

The device has 3 voltage measurement in­puts (V1 to V3) on the back of the device.

7. 4. 1 Overvoltage

The voltage measurement inputs are suit­able for measurement in networks in which overvoltage of category 600 V CAT III (voltage measurement surge of 6 kV) may occur.

7. 4. 2 Frequency

The device:
• requires the network frequency to measure and calculate the measurement values.
• is suitable for measurement in networks in which the fundamental oscillation of the voltage is within the range of 45 to 65 Hz.
The network frequency is derived from the measured voltage in phase L1. The sampling rate of the voltage and current measurement inputs is derived from the network frequency.
If the measurements have severely distort­ed voltages, it will no longer be possible to precisely determine the frequency of the fundamental oscillation of the voltage. I.e. the corresponding network frequency should be stipulated for measured voltages that exhibit severe distortions. (Voltage distortions occur e.g. in measure­ments of consumers operated with a phase angle control). Current distortions do not affect the determination of the frequency.
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More information can be found in Section 12 Configuration / Rated frequency"
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1.)
Fuse
1) 1) 1)
2) 2) 2)
Fig. Connection example for voltage measurement.
(UL/IEC listed)
2.)
Disconnector
(Circuit breaker)
L1
L2
L3
N
c
WARNING!
Risk of injury from electric
voltage!
Serious bodily harm or death may result from not complying with the connection requirements for the voltage measurement inputs.
For this reason, please note the follow­ing:
De-energise your system before starting work! Check that it has been de-energised!
Connect voltages that are over the admissible network rated voltages through voltage transformers.
The voltage measurement inputs on the device are dangerous to touch!
Install a circuit breaker as described in Section „7. 2 Trennschalter“.
Use a UL/IEC approved overvoltage protective device with a rating value that is measured for short-circuit cur­rent at the point of connection.
c
CAUTION!
Malfunction can result from
an improper connection
If the device is connected improperly, it may deliver measurement values with errors.
For this reason, please note the follow­ing:
Measurement voltages and currents must come from the same network.
The device is not suitable for measur­ing direct current.
ATTENTION!
C
The device can only determine mea­surement values if there is a voltage L1-N greater than 20 Veff (4-wire measurement) or a voltage L1-L2 greater than 34 Veff (3-wire measure­ment) at the voltage measurement input V1.
As an overvoltage protective device for the voltage measurement, use a line protection (1 - 10 A) with IEC/UL approval.
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7. 4. 3 Connection variants for voltage measurement

V1
V2
Fig. Voltage measurement in the three-phase
four-wire system
V1
V2
V3
V3
VN
VN

7. 5 Current measurement

The device:
• is designed to be connected to current transformers with secondary currents of ../1 A and ../5 A.
• is only approved for measuring current through current transformers.
• does not measure direct currents.
The factory preset current transformer ratio is 5/5 A, and may need to be adjusted to the current transformer in use.
Fig. Voltage measurement in the three-phase
four-wire system
V1
V2
Fig. Voltage measurement in the single-phase
three-wire system
V3
VN
L1
L2
L3
N
Fig. Connection example "Current measurement through
a current transformer."
S1 S2
S1 S2
S1 S2
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7. 5. 1 Current measurement connection
m
WARNING!
tric voltage on the current
transformers!
Voltage peaks that are extremely dangerous to touch may occur on current transformers operated with an open secondary side that may result in serious bodily harm or death.
For this reason, please note the following:
De-energise your system before start­ing work! Check that it has been de-en­ergised!
Avoid open operation of the current transformers.
Short-circuit uncharged current trans­formers.
The secondary terminals of the current transformer must be short-circuited before the power supply lines are dis­connected.
If a test switch that automatically short-circuits the current transformer secondary leads is available, it is suffi­cient to put this into the "test" position provided the short-circuiters have been checked beforehand.
Only use current transformers that have a base insulation as per IEC 61010-1:2010.
Ensure that the attached screw termi­nal is sufficiently secured to the device with the two screws.
Even "open-safe" current transform­ers are dangerous to touch if they are operated openly.
Risk of injury from elec-
variants
Fig. Current measurement via current transfor­mer in three-phase four-conductor system
Fig. Current measurement in single-phase three-conduc­tor system
Fig. Current measurement via 2 current transformers in three-phase four-conductor system
m
WARNING!
Risk of injury from electric
voltage!
At high measurement currents, temperatures of up to 80 °C can develop at the terminals.
Therefore, use leads that are designed to have an operating temperature of at least 80 °C.
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7. 5. 2 Direction of the current

The current direction can be individually cor­rected on the device or via the serial interfac­es for each phase.
In the case of incorrect connection, the cur­rent transformer does not need to be subse­quently reconnected.

7. 5. 3 Total current measurement

If the current measurement takes place via two current transformers, the total transform­er ratio of the current transformer must be programmed on the device. Setting the cur­rent transformer ratios is described in Section „Messwandler“.
Example:
The current measurement is performed via two current transformers. Both current trans­formers have a transformer ratio of 1000/5 A. The total measurement is then carried out with a total current transformer 5+5/5 A .

7. 5. 4 Ammeter

If you want to measure the current not only with the UMG but also with the ammeter, the ammeter must be connected in series to the UMG.
UMG
I
S2
1
S
A
Einspeisung Supply
(k)S
1 S2(l)
2(L)(K)P1
P
Fig. Circuit diagram with additional ammeter connected
in series
Verbraucher
Consumer
The device must then be set as follows:
Primary current: 1000 A + 1000 A = 2000 A Secondary current: 5 A
UMG
I
S
S2
1
Einspeisung 1 Supply 1
1P1
1S1
(K)
(k) (l)
(L)
1S
1P2
Verbraucher A Consumer A
2
P1
1S1 1S2 2S1 2S2
Fig. Example of voltage measurement via a total current
transformer
P2
Einspeisung 2
Supply 2
2S1 (k)
(l)
2S2
Verbraucher B
Consumer B
2P
(K) (L)
2P2
1
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