Users Manual
KMP7030
Loop Impedance Tester
KMP7030
Loop Impedance Tester
Users Manual
June 2011, Rev.1
©2011 Amprobe Test Tools.
All rights reserved. Printed in China
English
Limited Warranty and Limitation of Liability
Your Amprobe product will be free from defects in material and workmanship for 1 year from
the date of purchase, unless local laws require otherwise. This warranty does not cover fuses,
disposable batteries or damage from accident, neglect, misuse, alteration, contamination, or
abnormal conditions of operation or handling. Resellers are not authorized to extend any other
warranty on Amprobe’s behalf. To obtain service during the warranty period, return the product
with proof of purchase to an authorized Amprobe Test Tools Service Center or to an Amprobe
dealer or distributor. See Repair Section for details. THIS WARRANTY IS YOUR ONLY REMEDY.
ALL OTHER WARRANTIES - WHETHER EXPRESS, IMPLIED OR STAUTORY - INCLUDING IMPLIED
WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY, ARE HEREBY
DISCLAIMED. MANUFACTURER SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
OR CONSEQUENTIAL DAMAGES OR LOSSES, ARISING FROM ANY CAUSE OR THEORY. Since
some states or countries do not allow the exclusion or limitation of an implied warranty or of
incidental or consequential damages, this limitation of liability may not apply to you.
Repair
All test tools returned for warranty or non-warranty repair or for calibration should be
accompanied by the following: your name, company’s name, address, telephone number, and
proof of purchase. Additionally, please include a brief description of the problem or the service
requested and include the test leads with the meter. Non-warranty repair or replacement charges
should be remitted in the form of a check, a money order, credit card with expiration date, or a
purchase order made payable to Amprobe® Test Tools.
In-Warranty Repairs and Replacement – All Countries
Please read the warranty statement and check your battery before requesting repair. During the
warranty period any defective test tool can be returned to your Amprobe® Test Tools distributor for
an exchange for the same or like product. Please check the “Where to Buy” section on www.amprobe.
com for a list of distributors near you. Additionally, in the United States and Canada In-Warranty repair
and replacement units can also be sent to a Amprobe® Test Tools Service Center (see address below).
Non-Warranty Repairs and Replacement – US and Canada
Non-warranty repairs in the United States and Canada should be sent to a Amprobe® Test Tools
Service Center. Call Amprobe® Test Tools or inquire at your point of purchase for current repair
and replacement rates.
In USA In Canada
Amprobe Test Tools Amprobe Test Tools
Everett, WA 98203 Mississauga, ON L4Z 1X9
Tel: 877-AMPROBE (267-7623) Tel: 905-890-7600
Non-Warranty Repairs and Replacement – Europe
European non-warranty units can be replaced by your Amprobe® Test Tools distributor for a
nominalv charge. Please check the “Where to Buy” section on www.amprobe.eu for a list of
distributors near you.
European Correspondence Address*
Amprobe® Test Tools Europe Robin-Amprobe® Test Tools UK
Beha-Amprobe GmbH 52 Hurricane Way
In den Engematten 14 Norwich, Norfolk, NR6 6JB
79286 Glottertal, Germany United Kingdom
Tel.: +49 (0) 7684 8009 - 0 Tel.: +44 (0) 1603 25 6662 Fax.: +44 (0) 1603 25 6664
www.amprobe.eu www.robin-amprobe.co.uk
*(Correspondence only – no repair or replacement available from this address. European
customers please contact your distributor.)
1
1
2
7
8
3
4
6
9
5
2
3
Rotary Switch: Select
measurement function and range
Loop impedance measurement
Short-circuit current
measurement
ON / OFF Button
Display Backlight Button
6
7
8
Non Trip test on passive RCDs
Automatic measurement reading
lock (except for measurement
range LOOP-2000Ω)
TEST Button: Starts the selected test
Display
Measuring terminal
KMP7030
Loop Impedance Tester
4
5
9
10
10
Display
1 2 3 6
7
8
4 5
9
11
10
12
13
14 15 16
1
Over-temperature. Wait while the tester cools down
2
Measurement reading lock
3
Noise appears between neutral to earth
4
Line to earth voltage
5
Fault voltage. Protect earth voltage higher than 50V
6
Battery status indicator
7
Measuring
8
Calibration mode
9
Hazardous voltage
10
Non Trip test on passive RCDs
11
Voltage
12
Loop impedance
13
Prospective short-circuit current
14
Correct line and earth wire connection
15
Correct neutral and earth wire connection
16
Warning! Incorrect connection for line and neutral.
Reverse the connection.
1
KMP7030
Loop Impedance Tester
CONTENTS
SYMBOL .................................................................................................................2
SAFETY INFORMATION .........................................................................................2
UNPACKING AND INSPECTION .............................................................................3
PRODUCT DESCRIPTION ........................................................................................3
FEATURES ...............................................................................................................4
MAKING MEASUREMENT .....................................................................................5
Measuring Volts and Frequency .......................................................................5
Measuring Loop Impedance .............................................................................6
Measuring loop impedance NO TRIP mode ....................................................6
Measuring for Line Resistance and Prospective Short-circuit Current ...........7
Fault Loop Impedance and Fault Prospective Short-Circuit Current ..............8
SPECIFICATION .......................................................................................................13
MAINTENANCE AND REPAIR ................................................................................14
BATTERY REPLACEMENT .......................................................................................15
2
SYMBOLS
Caution ! Risk of electric shock Battery
Caution ! Refer to the
explanation in this Manual
Earth Ground
Ω
Loop Impedance
Complies with EU directives
CAT III
CAT III Testers are designed to
protect against transients in
fixed equipment installations
at the distribution level.
Do not dispose of this
product as unsorted
municipal waste. Contact a
qualified recycler
Safety Information
The Tester complies with:
IEC/EN 61010-1 2nd Edition Pollution Degree 2, Measurement Category III 300V
IP40 as per EN 60529
EMC EN 61326-1
EN 61557-1, EN 61557-3
Warning: Read Before Using
• To avoid possible electric shock or personal injury, follow these
guidelines:
• Use this product only as specied in this manual or the protection
provided by the product might be impaired.
• Do not use the product if it is damaged. Before you use the product,
inspect the case. Look for cracks or missing plastic.
• Make sure the battery door is closed and latched before operating the
product.
• Remove power cord from the product before opening the battery door.
• Inspect the power cord for damaged insulation or exposed metal.
Replace damaged power cord before you use the Tester.
• Do not apply more than the rated voltage, as marked on the product.
• Never operate the product with the cover removed or the case open.
Hazardous voltage exposure is possible.
• Do not use the product if it operates abnormally. Protection may be
impaired. When in doubt, have the product serviced.
3
• Do not operate the product around explosive gas, vapor, or dust.
• Use only 1.5 V AA batteries, properly installed in the product case, to
power the product.
• Use the proper function and range for all measurements.
• Measure a known voltage and loop impedance rst to make sure that
the product operates correctly.
• Disconnect the power circuit if display shows “HOT” (overheating).
• Comply with local and national safety codes. Use personal protective
equipment (approved rubber gloves, face protection, and ameresistant clothes) to prevent shock and arc blast injury where hazardous
live conductors are exposed.
UNPACKING AND INSPECTION
Your shipping carton should include:
1 Loop Impedance Tester
1 UK Test Cord set
1 Strap
1 Users Manual
1 Carrying case
8 1.5V AA alkaline batteries
If any of the items are damaged or missing, return the complete package to
the place of purchase for an exchange.
PRODUCT DESCRIPTION
Loop testing is a quick, convenient, and highly specific method of evaluating
an electrical circuit for its ability to engage protective devices (circuit breakers,
fuses, RCD’s). A “loop” is defined by including unsuspected elements, where
current has found parallel paths to ground. Because a ground loop determines
the effectiveness of protective devices, it is crucial to be able to measure it, in
order to detect and correct problems.
4
FEATURES
• Non Trip Loop test on passive RCDs
• Instant reading
• 20, 200 & 2000Ω Loop measurement ranges
• PSC measurement up to 20kA
• Displays mains voltage before test
• Instant correct wiring status check
• Backlight display
• Low Battery Indication
• CAT III 300V
This product is intended to be used to measure installations in process plants,
industrial installations, and residential applications.
EN 61557-3 Measurement Range:
Function Display Range
EN 61557
Measurement Range
Operating Error
Nominal
Values
LOOP
EN 61557-3
LOOP (NO TRIP)
0.00Ω - 20.0Ω
0.0Ω - 200Ω
0.50Ω - 19.99Ω ±(3% + 6LSD)
10.0Ω - 199.9Ω ±(3% + 6LSD)
Un=230VAC
f = 50Hz
Ik=20kA
LOOP
(HI CURRENT)
0.00Ω - 20.0Ω
0.0Ω - 200Ω
0Ω - 2000Ω
0.50Ω - 19.99Ω ±(3% + 4LSD)
10.0Ω - 199.9Ω ±(3% + 4LSD)
100Ω - 1999Ω ±(3% + 4LSD)
Volts
100 – 300V,
50/60Hz
100 – 300V, 50/60Hz
±(2% + 4LSD)
Ambient Temperature: 23±2°C
Ambient Humidity: 45 - 75%RH
Additional operating uncertainties from position, supply voltage temperature,
system phase angle system frequency, system voltage, harmonics and D.c
quantity. The overall operating uncertainty B% is within +/- 30%
Measurement times: approx. 8000 times or more (with new batteries)
5
MAKING MEASUREMENTS
When low battery voltage mark “ ” shows on LCD screen,
replace the batteries before measurement.
Low Battery Voltage Display Symbol Voltage of Battery
When 9.2V or lower
Measuring Volts and Frequency
Figure 1: Voltage Measurement Figure of Loop Impedance/Line Impedance/
Power Supply Socket-Outlet.
To measure voltage and frequency:
1. Turn the rotary switch to the Impedance function.
2. Connect the Tester to the mains socket outlet. Check the signs for correct
connections of L, N and PE.
3. The display shows the AC voltage and frequency.
Measuring Loop Impedance (See Connection Diagram in Figure 1)
Warning!
Make sure the power supply socket-outlet’s wiring is correct and the ground
wire is reliably connected earth. The tester displays the existing voltage in the
6
socket-outlet and displays symbols of “P-E•” and “P-N•” to indicate the wiring
connections.
The Tester displays the symbol of “LO V” when the voltage is lower than
100Vac .
Make sure the grounding of the socket-outlet is connected to Earth. The
symbol of “P-N
•” and “•” on the display means grounding wire is not
connected to earth or not well-connected to earth.
When measuring the loop impedance/prospective short-circuit current, make
sure line and neutral wires are connected correctly. Otherwise, Tester will
display “230V”, “P-E
•”, “P-N•”,• “
Loop Impedance (Line to Protective Earth L-PE)
To measure loop impedance:
1. Turn the rotary switch to the impedance function (select range for
display resolution).
2. Connect the Tester to the mains socket outlet. The voltage of the circuit
will appear on display. Check the signs for correct connections of L, N
and PE.
3. Press TEST button (the measurement would take few seconds to 60
seconds)
4. The display shows the measured loop impedance
Measuring loop impedance NO TRIP mode:
To prevent tripping RCDs in the circuit:
• Use the NO TRIP function for loop measurements.
• An RCD with a nominal fault current of 15mA or above will trip.
To measure loop impedance NO TRIP mode:
1. Press NO TRIP button. NO TRIP sign will appear on display.
2. Turn the rotary switch to the impedance function (select range for
display resolution).
3. Connect the Tester to the mains socket outlet. The voltage of the circuit
will appear on display. Check the signs for correct connections of L, N
and PE.
7
4. Press TEST button (the measurement would take few seconds to 60
seconds)
5. The display shows the measured loop impedance
Measuring for Line Resistance and Prospective Short-circuit Current
The line resistance is the resistance measured between the phase line L and
the neutral line N in single-phase power system. The measurement principle is
same as fault circuit impedance measurement. However, the measurement is
done between L and N.
Warning!
The capacity of the overload current protection shall be higher than the
calculated prospective short-circuit current.
To measure Line Resistance and Prospective Short-circuit Current (PSC):
1. Turn the rotary switch to the PSC function (or LOOP) (select range for
display resolution).
2. Connect the Tester to the mains socket outlet. The voltage of the circuit
will appear on display. Check the signs for correct connections of L, N
and PE.
3. Press TEST button (the measurement would take few seconds to 60
seconds)
4. The display shows the PSC (or line resistance)
Example of measurement for line resistance and prospective short-circuit
current:
The following figure is for the principle of the line impedance measurement
between Neutral N and Phase Line L1:
8
Figure 2
WARNING!
• The Tester can only connect the mains AC230V+10%/-15% phase to
ground or OLD-TT system’s neutral line.
• Disconnect between the Tester and the circuit when overheating symbol
“HOT” shows on the display. Wait while the tester cools down
Fault Loop Impedance and Fault Prospective Short-Circuit Current
In case there is overflow protective device or fuse in the electrical circuit, its
fault impedance shall be measured. Fault loop resistance shall be small, so that
overflow protective device or fuse can automatically cut off the circuit within
specified time in the case of fault.
Inspect circuit’s fault impedance in order to determine protective device’s
specified value in circuit is not exceeded.
TT system’s fault impedance consists of the following parts:
• Power transformer’s secondary winding resistance;
• Phase line from power transformer to fault location;
• Protective conductor resistance from fault location to grounding electrode;
• Grounding resistance R;
• Power transformer grounding system’s resistance Ro.
9
Figure 3: TT System
Circuits in TT system shall meet the following conditions in accordance to the
international standard IEC 60364: RA≤50/Ia
Here:
• RA is the sum of the ground connecting resistance R and the conductor
resistance.
• 50 is the maximum contact voltage.
• la is the current that can enable the protective device to automatically
trip within five seconds.
la is the rated residual current l
n when the protective device is the residual
current equipment (RCD).
For instance, RCD protective device exists in TT system and its maximum RA
value is:
I n
Rated Residual Current I
n
10 30 100 300 500 1000 mA
RA (50V) 5000 1667 500 167 100 50 Ω
RA (25V) 2500 833 250 83 50 25 Ω
The fault impedance is measured by KMP7030 is slightly higher than RA
value, However, if the circuit impedance value is considered when the circuit is
protected, follow RA value.
The following is the example to test TT system protection in accordance to the
international standard IEC 60364:
10
Figure 4
This example’s maximum value is 1667Ω and Tester’s reading is 12.50Ω
conforming to RA≤50/Ia.
RCD test shall also be carried out in order to determine that using RCD
protective device effective and meet the safety requirements.
TN system’s fault impedance consists of the following parts:
• Power transformer’s secondary winding resistance
• Phase line from power transformer to fault location
• Protective conductor resistance from fault location to power transformer
• Grounding resistance R
• Power transformer grounding system’s resistance Ro.
Figure 5: TN System
Circuits in TN system shall meet the following conditions in accordance to the
international standard IEC 60364: Zs≤Uo/Ia
Where:
Zs is fault circuit resistance.
Uo is the rated voltage between phase and grounding.
la is the current that can enable the protective device to act within the time in
the following table.
Uo(V) T(S)
120 0.8
230 0.4
400 0.2
>400 0.1
• For the distribution line, no the tripping time exceeding ve seconds is
allowed.
• la is the rated residual current I
n when the protective device is the
residual current device (RCD).
12
For instance, in TN system, rated power Uo=230V, the protective device, la
value and maximum Zs value may be as follows:
Rated(A)
5s of Tripping Time 0.4s of Tripping Time
Ia (A) Zs (Ω) Ia (A) Zs (Ω)
6 28 8.2 47 4.9
10 46 5 82 2.8
16 65 3.6 110 2.1
20 85 2.7 147 1.56
25 110 2.1 183 1.25
32 150 1.53 275 0.83
40 190 1.21 320 0.72
50 250 0.92 470 0.49
63 320 0.71 550 0.42
80 425 0.54 840 0.27
100 580 0.39 1020 0.22
The prospective fault current can also be measured by KMP7030 PSC function.
The prospective fault current must be higher than la.
The following is the example to test TN system’s protection in accordance to
the international standard IEC 60364:
Figure 6
13
SPECIFICATION
Ambient Temperature: 23±5°C
Ambient Humidity: 45 - 75%RH
Error Limit: ±(% Reading + dgt Count)
Loop Impedance:
Range Display Range
Rated Test Current
and Time
Accuracy
20Ω 0.00 - 19.99Ω 25A/10ms
±(3%rdg+4LSD)200Ω 0.0 - 199.9Ω 2.3A/20ms
2000Ω 0 - 1999Ω 15mA/360ms
20Ω
NO TRIP
0.00 - 19.99Ω
L-N<20Ω*
1
P-N: 25A/30ms
N-E: 15mA/approx. 2s
±(3%rdg+6LSD)
20Ω
NO TRIP
0.00 - 199.9Ω
L-N<20Ω*
1
*1: If the impedance between L-N is 20Ω or more, “no” is displayed on the
display and no measurement can be made. In this case, disables NO TRIP
function and make measurement.
Prospective Short-Circuit Current:
Range Display Range
Rated Test Current
and Time
Accuracy
200A 0.00 - 199.9A 2.3A/20ms
±(3%rdg+4LSD)2000A 0.0 - 1999A 25A/10ms
20kA 0.00 - 19.9kA 25A/10ms
200A
NO TRIP
0.00 - 199.9A
L-N<20Ω*
1
P-N: 25A/30ms
N-E: 15mA/approx. 2s
±(3%rdg+6LSD)
2000A
NO TRIP
0.00 - 1999A
L-N<20Ω*
1
20kA
NO TRIP
0.0 - 19.9kA
L-N<20Ω*
1
*1: If the impedance between L-N is 20Ω or more, “no” is displayed on the
display and no measurement can be made. In this case, disables NO TRIP
function and make measurement.
14
Voltage Measurement:
AC Voltage
Measuring Range 100 - 300V(50/60Hz)
Resolution 1V
Accuracy ±(2%+4LSD)
Display: maximum reading is 9999.
Low Battery warning indication: “
”
Over-range indication: “OL”
Operating Condition: 0°C - 40°C, <85% Relative Humidity
Storage Condition: -20°C - 60°C, <90% Relative Humidity
Dimension (L x W x D): 189 × 167 × 85mm (7.43 x 6.65 x 3.35in)
Weight: 1kg (2.2lb) (including battery)
Power Supply: Alkaline Battery 1.5V (AA Battery) × 8pcs
MAINTENANCE AND REPAIR
If there appears to be a malfunction during the operation of the meter, the
following steps should be performed in order to isolate the cause of the
problem.
1. Check the battery. Replace the battery immediately when the symbol
“
” appears on the display.
2. Review the operating instructions for possible mistakes in operating
procedure.
Except for the replacement of the battery, repair of the meter should be
performed only by an Authorized Service Center or by other qualified
instrument service personnel.
The front panel and case can be cleaned with a mild solution of detergent and
water.
Apply sparingly with a soft cloth and allow to dry completely before using. Do
not use aromatic hydrocarbons, Gasoline or chlorinated solvents for cleaning.
15
Battery Replacement
Replace the batteries immediately after the low battery indicator appears on
the screen. Follow the steps below to replace the batteries:
1. Disconnect the power cord from mains socket-outlet.
2. Turn the OFF the Tester
3. Remove the screws from the battery cover and open the battery cover
4. Remove the batteries and replace with 8 new 1.5V Alkaline Batteries
(AA). Pay attention to the polarity signs.
5. Put the battery cover back and re-fasten the screw.
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