EPA LEAKWATCH LW-MZ-50 User manual
Instruction manual
Measuring range
1 A and 10 A
For use with
measuring card
LW-MK3plus
No disconnection
of the current path
necessary
Can also be used
with larger cable
cross-sections
Current clamp - LW-MZ-50
for leakage current measurement
Instruction manual for current clamp LW-MZ-50
Contents
1.0 Important basic information ............................................................. 1
1.1 Legal notice ........................................................................................................ 1
1.2 Target group ........................................................................................................ 1
1.3 Liability ................................................................................................................ 2
1.4 General equal treatment ..................................................................................... 2
1.5 Registered trademark ......................................................................................... 3
1.6 CE mark .............................................................................................................. 3
2.0 Symbols ............................................................................................. 4
3.0 Safety Instructions ............................................................................ 5
4.0 Warrenty ............................................................................................ 5
5.0 Device overview ................................................................................ 5
6.0 Device description ............................................................................ 5
7.0 Technical data ................................................................................... 7
8.0 Usage ................................................................................................. 7
8.1 Measuring deviation and phase error ................................................................ 7
8.2 Operating conditions .......................................................................................... 7
8.3 Dimensions, weight ............................................................................................ 8
8.4 Compliance with international standards ........................................................... 8
9.0 Inspection and maintenance ............................................................ 9
9.1 Cleansing, care ................................................................................................... 9
9.2 Revision ............................................................................................................... 9
9.3 Repair ................................................................................................................ 10
9.4 Service address ................................................................................................ 10
9.5 Disposal ............................................................................................................ 10
10.0Notes ............................................................................................... 10
www.leakwatch.de 1
Instruction manual for current clamp LW-MZ-50
1.0 Important basic information
1.1 Legal notice
Publisher: EPA GmbH
Fliederstr. 8
63486 Bruchköbel
Deutschland
Tel.: +49 (0) 6181 – 9704 -0
Fax: +49 (0) 6181 – 9704 -99
Web: www.leakwatch.de
www.epa.de
Implementation: K. Bonkosch
Author: T. Bozem
Issue number: 2 /11.2022
Document history: First issue: 07.2015
© EPA GmbH
All rights, including photomechanical reproduction and storage in electronic
media, are reserved by EPA GmbH. Commercial use or distribution of the
texts, models shown, drawings and photos used in this product are not
permitted.
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Instruction manual for current clamp LW-MZ-50
1.2 Target group
This documentation is intended for qualified personnel according to IEC
60417-6182.
Qualified personnel are persons who have the appropriate
qualifications for the activities to be carried out during installation,
assembly, commissioning and operation of the product
(electricians).
1.3 Liability
The names, trade names, product names and other designations used may
be protected by law even without special identification (e.g. as trademarks).
EPA GmbH assumes no liability or warranty for their free usability.
The greatest care has been taken in the compilation of illustrations and texts.
Nevertheless, errors cannot be excluded.
The compilation is without guarantee.
The information is for customer information purposes only and does not
contain any assurances or binding guarantees. Binding statements can only
be made in response to specific enquiries.
The contents of these operating instructions are believed to be correct at the
time of going to press. In order to maintain continuous development work,
the manufacturer reserves the right to change the specification of the product
and its performance data as well as the content of these instructions for use,
both technically and commercially, without prior notice. The current version is
made available at www.leakwatch.de or www.epa.de.
EPA GmbH accepts no liability for any damage resulting from incorrect use
of these operating instructions or incorrect or inappropriate installation or
settings. Business interruptions, lost profits as well as loss of information and
data or consequential damages are excluded, unless liability is mandatory
under the Product Liability Act or in cases of intent, gross negligence or
breach of fundamental contractual obligations.
1.4 General equal treatment
EPA GmbH is aware of the importance of language with regard to the equality
of all genders and always endeavors to take this into account. Nevertheless,
for reasons of better readability, it was necessary to refrain from using
differentiating formulations throughout.
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Instruction manual for current clamp LW-MZ-50
1.5 Registered trademarks
Trademarks are the property of their respective owners and are not generally
identified as such in this manual.
The absence of such a designation does not mean that it is a free name
within the meaning of trademark and brand law.
1.6 CE marking
The CE marking is located on the rating plate of the unit and on
the packaging.
The unit meets the relevant basic requirements of all applicable
EU directives.
Thank you for purchasing an EPA LW-MZ-50 current clamp and for the
confidence you have placed in us. In order to achieve the best results with
your LEAKWATCH measuring and analysis system, please:
• Read these operating instructions carefully.
• Observe the safety instructions contained therein.
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Instruction manual for current clamp LW-MZ-50
2.0 Symbols an signal words
To indicate hazards and important information, the following symbols and
signal words are used in this documentation:
Symbol /
signal word
Meaning
Danger
Alerts you to a dangerous situation that will result in
serious injury or death if not avoided.
Warning
Alerts you to a dangerous situation that may result in
serious injury or death if not avoided.
Caution
Alerts you to a dangerous situation that may result in a
minor to moderate injury if not avoided.
NOTE /
OBSERVE
Makes you aware of the handling and impact of safety
information.
The unit is insulated or protected by reinforced
insulation. Connection to an earth conductor is not
necessary to ensure electrical safety.
The output of these clamp current transformers is
equipped with an electronic protection circuit that li-
mits overvoltages to max. 30 V peak if the secondary
circuit of the clamp is accidentally opened.
CAT III The current clamp corresponds to overvoltage cate-
gory III with a pollution degree of 2 and thus fulfils the
strict safety and reliability requirements for perma-
nently installed electrical installations in industry and
households (cf. IEC standard 664-1).
Must not be handed in at the municipal collection points
for electrical appliances or disposed of with household
waste.
àß
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Instruction manual for current clamp LW-MZ-50
3.0 Safety Instructions
• Never measure currents above 10 A and – if possible – reduce the
measuring time if current peaks exceed 10 A.
• Never use the current clamp on non-insulated conductors with a potential
of more than 600 V to earth and with an overvoltage category higher
than III.
• The permissible environmental conditions must be observed.
• Always keep the clamp gap meticulously clean.
4.0 Warrenty
Unless expressly agreed otherwise, our warranty covers a period of
12 months from the date of invoice.
5.0 Device overview
The LW-MZ-50 current clamp is used for measuring alternating currents from
1mA to 10 A.
The current clamp can be connected to the LEAKWATCH LW-MK3plus.
The current measuring range can be set by adjusting the range switch (1 A,
and 10 A).
The current clamp is double-insulted or provided with safety insulation and
complies with international standards, in particular EN 61010-2-032 for clamp
current transformers.
6.0 Device description
Figure see page 6
Output: Cable length 2 m
Range switch 1 A and 10 A
The arrow stamped on top of the jaws indicates the direction of the
current. It is assumed that the electricity flows from the generator to the
consumer in a “positive” direction. The direction of flow in alternating
currents is only of significance for power measurements, i.e. the
simultaneous measurement of current and voltage.
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Instruction manual for current clamp LW-MZ-50
Dimensions see 8.3
Limit the duration of the measurement for currents between 10 A and
12 A: 15 minutes of operation and then 30 minutes break.
Always connect the clamps to the meter first before clamping a
conductor. In the same sense, the clamps must not be disconnected
from the meter while still clamped onto a conductor.
• Before connecting the current clamp, check that the LEAKWATCH
software is configured correctly.
• Open the clamp jaws and enclose the conductor with the current
to be measured. Centre the conductor in the jaws as much as
possible and pay attention to the flow direction of the current if the
measurement requires it.
• When reading the measured value, pay attention to the measuring
range set in the software.
• Position the current clamp so that the conductor to be measured
runs through the clamp centrally and at a right angle (do not
position at an angle - this will falsify the measured value). The
maximum conductor diameter may be 50 mm. It must be possible to
close the clamp completely, otherwise no measurement is possible.
NOTE: Select the measuring range with the best resolution and accuracy.
53 mm
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Instruction manual for current clamp LW-MZ-50
7.0 Technical data
• Temperature: -10° ... +50°C
• Rel. humidity: 20% ... 75%
• The conductor is in the centre of the clamps
• Sinusoidal alternating current with: 10 Hz...150 kHz
• THD: < 1%
• No DC component
• External DC magnetic field: Earth magnetic field (<40 A/m)
• Inputimpedance: ≥1MΩand≤47pF
• No external AC magnetic field
• No other live conductors in the vicinity
8.0 Usage
8.1 Measuring deviation and phase error
Range 10 A (30 A peak max.)
Current strength in A~ 0,01...0,5 A 0,5...2 A 2...10 A 10...12 A
Measurement deviation(1) ≤3%(3)
Phase error (2) ≤15° ≤10° ≤5°
Range 1 A (3 A peak max.)
Current strength in A~ 0,01...0,05 A 0,05...0,2 A 0,2...1 A 1...1,2 A
Measurement deviation(1) ≤3%(3)
Phase error (2) (2) ≤15° ≤5°5
(1) In % of the output signal (2) No information (3) Sinusoidal, 50 Hz...10 kHz
8.2 Operating conditions
To ensure the safety of the user and the metrological properties, the current
clamps must be operated under the following conditions.
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Instruction manual for current clamp LW-MZ-50
Maximum current
Limit the measuring time for currents over 10 A!
Current strength I < 10 A 10 A~ < I < 12 A~
Operation Continuous
(1)
15 minutes operation,
then 30 minutes break
(1)AtafrequencyFF≤1kHz
Frequencies
• Operating range: 10 Hz to 150 kHz (-6 dB between 20 kHz and
150 kHz)
• At frequencies > 1 kHz, limit the current according to the following
formula: I duration = 10 A
f (in kHz)
Ambient conditions
• Indoor use only
• Heightabovesealevel:≤2000m
• Climate conditions: -10° to + 55 °C and rel. humidity < 85%
• Do not expose the device to splash water
8.3 Dimensions, weight
• Outer dimensions 216 x 111 x 45 mm
• Weight approx. 550 g
• Clamp opening 53 mm
• Height with open clamps 139 mm
• Max. enclosure Cable with Ø 52 mm or 1 busbar 5 x 5 mm
or 4 busbars 30 x 5 mm
Dimension drawing see page 6
8.4 Compliance with international standards
Electrical safety (according to EN 61010-1 and EN 61010-2-032)
• Protectively insulated
• Pollution degree 2
• 600 V system class III
• 300 V system class IV
Electromagnetic compatibility
• Interference emission and interference immunity in an industrial
environment in accordance with EN 61326-1.
x 100
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Instruction manual for current clamp LW-MZ-50
Mechanical protection
• Protection class IP40 (according to EN 60529) with closed clamps or IP30
with clamps open.
Self-extinguishing material
• Clamp jaws: V0 (acc. to UL 94)
9.0 Inspection and maintenance
The LW-MZ-50 current clamp is maintenance-free when used as intended.
maintenance-free.
Inspection or maintenance of the LW-MZ-50 current clamp may only be
carried out by qualified electricians.
Modifications to the unit, unless explicitly described in these operating
instructions, may only be carried out by EPA or persons authorised by EPA.
The accident prevention regulations must be observed.
9.1 Cleaning, care
When cleaning, the LW-MZ-50 current clamp must not enclose a conductor
and must be disconnected from the measuring device. Do not splash the
clamp with water.
• The air gap of the clamp jaws must always be clean. Remove dust and
dirt with a dry soft cloth. Wipe the air gap with an oil-soaked cloth from
time to time to protect it from rust.
• Clean the housing with a cloth and a little soapy water, then wipe with a
damp cloth. Then dry the unit with a cloth or blow it off with max. 70°C
warm air.
9.2 Revision
As with other measuring or testing devices, a regular device check
is required. It is recommended to check the instrument once a year.
For checking and calibration, please contact our approved measuring
laboratories (information and addresses on request) or EPA GmbH directly.
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Instruction manual for current clamp LW-MZ-50
9.3 Repair
The LW-MZ-50 current clamp can be damaged or destroyed if the instructions
are not followed.
The housing must not be opened.
Repairs may only be carried out by EPA or repair centres authorised by EPA.
Unauthorized tampering can lead to property damage. In this case, EPA‘s
warranty becomes void.
9.4 Service address
EPA GmbH
Fliederstr. 8
63486 Bruchköbel
Germany
Phone: +49 (0) 6181 - 97 04 0
Fax: +49 (0) 6181 - 97 04 99
E-mail: [email protected]
Web: www.epa.de
9.5 Disposal
The current clamp LW-MZ-50 is a device for commercial / industrial use.
This equipment must not be handed in at the municipal collection points for
electrical equipment or disposed of with household waste.
If you have any questions, please contact us.
OBSERVE: The units contain electronic components and must be disposed
of properly.
WEEE reg. no.: DE 64732845
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Instruction manual for current clamp LW-MZ-50
10.0 Notes
EPA GmbH
Fliederstraße 8, D-63486 Bruchköbel
Deutschland / Germany
Telefon / Phone: +49 (0) 6181 9704- 0
Telefax / Fax: +49 (0) 6181 9704- 99
E-Mail: [email protected]
Internet: www.epa.de
All information without liability for correctness and accuracy.
Presented by:
Brands – business names – work titles
Company and product names used by EPA are used only for labeling and are mentioned without taking into account any commercial protection right; the lack of the marking of a possibly
existent commercial protection right does not mean that the used company and /or product name is available. The EPA logo is a registered trademark for the EPA GmbH.
All rights reserved. Technical changes without notice. Release: 2 / 11.2022 Order no.: 50275721
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