Kyoritsu Electrical Instruments 5050-00 User manual

Instruction manual
Ior LEAKAGE CURRENT LOGGER
KEW 5050
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Contents KEW5050
Contents
Unpacking procedure ............................................................................................ 5
Safety warnings ..................................................................................................... 7
1.
2.
3.
Functional overview ............................................................................... 11
Features ................................................................................................. 11
Constructional drawing .......................................................................... 12
Steps for measurement .......................................................................... 13
Product layout ........................................................................................ 14
Display(LCD)/ Keys ................................................................................ 14
Connector .............................................................................................. 15
Side face ................................................................................................ 16
Voltage test lead and clamp sensor ....................................................... 17
Basic operations .................................................................................... 18
Keys ....................................................................................................... 18
Icons on LCD ......................................................................................... 19
Symbols on LCD .................................................................................... 19
Screens .................................................................................................. 20
Rough chart of available screens ........................................................... 20
Measured value (vector) ........................................................................ 21
Event ...................................................................................................... 22
Settings .................................................................................................. 23
4.
5.
Leakage current ..................................................................................... 24
Leakage current (Io) measurement ........................................................ 24
Resistive leakage current (Ior) measurement ........................................ 25
Single-phase 2-wire ............................................................................... 25
Single-phase 3-wire ............................................................................... 25
Three-phase 3-wire ................................................................................ 26
Three-phase 4-wire ................................................................................ 26
Ior measurement on wiring with different capacities .............................. 27
Getting started ....................................................................................... 27
Attaching markers to clamp sensors ...................................................... 27
Power supply ......................................................................................... 27
Battery ................................................................................................... 27
How to install batteries ........................................................................... 28
The battery indicator/ AC power icon ..................................................... 29
AC adapter ............................................................................................. 30
AC adapter connection .......................................................................... 31
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KEW5050 Contents
Placing/ removing SD card .................................................................... 32
Inserting SD card ................................................................................... 32
Removing SD card ................................................................................. 32
Voltage test lead and Clamp sensor connection .................................... 33
Start KEW5050 ...................................................................................... 34
Start-up screen ...................................................................................... 34
Cautionary message .............................................................................. 34
Connection to the measured object ....................................................... 35
Connection method (Selecting wiring system: Wiring diagram) ............. 36
Recording procedure ............................................................................. 38
How to start recording ............................................................................ 38
How to stop recording ............................................................................ 38
6.
Settings .................................................................................................. 39
Moving the highlighted cursor ................................................................ 39
Detail settings ........................................................................................ 40
Basic setting .......................................................................................... 41
Sensor recognition ................................................................................. 41
Current clamp sensor/ ch ....................................................................... 42
Frequency .............................................................................................. 45
Event setting .......................................................................................... 45
Common settings to all events ............................................................... 45
Upper threshold value (H)/ ch ................................................................ 46
Lower threshold value (L) ...................................................................... 48
Peak threshold value (Pk)/ch ................................................................. 50
Recording setting ................................................................................... 53
Recording method .................................................................................. 53
Possible recording time .......................................................................... 56
Saved data ............................................................................................. 57
Recorded data ....................................................................................... 57
KEW5050 settings ................................................................................. 59
Types of saved data ............................................................................... 61
Others .................................................................................................... 63
Environmental settings ........................................................................... 63
KEW5050 system settings ..................................................................... 64
7.
KEW5050 2
Displayed Items ..................................................................................... 67
Measured values .................................................................................... 67
Displaying vector diagram ...................................................................... 68
Displaying measured values of entire system ........................................ 69
Event ...................................................................................................... 71
Displaying information on occurred event .............................................. 71
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Contents KEW5050
8.
9.
10.
11.
12.
Other functions....................................................................................... 75
Device connection .................................................................................. 77
Data transfer to PC ................................................................................ 77
Signal control ......................................................................................... 78
Connection to output terminal ................................................................ 78
Getting power from measured line ......................................................... 79
PC software for setting and data analysis .............................................. 80
Specifications ......................................................................................... 81
Safety requirements ............................................................................... 81
General specification ............................................................................. 81
Measurement specification .................................................................... 83
Instantaneous events to be measured ................................................... 84
Items to be calculated ............................................................................ 85
Event items ............................................................................................ 88
Troubleshooting ..................................................................................... 89
General troubleshooting ......................................................................... 89
Input and display items .......................................................................... 91
Error messages and actions .................................................................. 91
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KEW5050 Contents
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Unpacking procedure KEW5050

Unpacking procedure

We thank you for purchasing our KEW5050 Ior LEAKAGE CURRENT LOGGER . Please check all the items listed below are included in the box.
1 Main unit KEW5050 : 1 pce
Voltage test lead
2
Power cord
3
MODEL7273 : One set with alligator clip
(red & black, 1 pce. each)
MODEL7170 : 1 pce
4 AC adapter 5 Earth cable MODEL7278 : 1 pce 6 USB cable MODEL7219 : 1 pce 7 SD card (2GB) 1 pce 8 CD-ROM PC software : 1 pce
9 Battery Alkaline size AA battery (LR6) : 6 pcs 10 Carrying bag MODEL9125 : 1 pce 11 Cable marker 4 colors x 2 pcs each (red, yellow , blue, green) 12 Instruction manual 1 pce 13 Software installation manual
1.
Main unit
2. Voltage test lead 3. Power cord
MODEL8262 : 1 pce
1 pce
4. AC adapter 5. Earth cable 6. USB cable
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KEW5050 Unpacking procedure
7. SD card (2GB) 8. CD-ROM 9. Battery
Carrying bag
10.
Software installation manual
13.
Cable marker
11.
Instruction manual
12.
<Storage>
In case any of the items listed above are found to be damaged or missing, or if the printing is unclear, plea se contact your local KYORITSU distributor.
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Safety warnings KEW5050
Optional accessories
1
2
1. Ior leakage clamp sensor 2. Power adapter
KEW8177 KEW8178 (Ø 40 mm) (Ø 68 mm)
Ior leakage clamp sensor
Power adapter MODEL8329 (CAT III 150 V, CAT II 240 V)

Safety warnings

KEW8177 (10 A/ Ø40mm) KEW8178 (10 A/ Ø68mm)
KEW5050 Ior Leakage current logger (Product) has been designed, manufactured and tested according to IEC 61010: Safety requirements for Electronic Measuring apparatus, and delivered in the best condition after passing quality control tests. This instruction manual contains warnings and safety procedures which
have to be observed by the user to ensure safe operation of the Product and to maintain it in safe condition. Therefore, read through these operating instructions before starting to use the Product.
WARNING
- For about instruction manual –
Read through and understand the instructions contained in this manual before starting to use the Product.
Keep the manual at hand to enable quick reference whenever necessary.
The Product is to be used only in its intended applications.
Understand and follow all the safety instructions contained in the manual.
Read the instruction manual for clamp sensor after reading this instruction manual.
It is essential that the above instructions are adhered to. Failure to follow the above instructions may cause injury or damage the Product, and/or damage the equipment under test. Kyoritsu assumes no responsibility for damage and injury caused by misuse or not following the instructions in the manual.
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KEW5050 Safety warnings The symbol
for safe operation of the Product. It is essential to read the instructions wherever the symbol appears in the manual.
DANGER: WARNING: CAUTION:
Measurement Category To ensure safe operation of measuring instruments, IEC 61010 establishes safety standards for various electrical environments, categorized as O to CAT IV, and called measurement categories. Higher-numbered categories correspond to electrical environments with greater momentary energy, so a measuring instrument designed for CAT III environments can endure greater momentary energy than one designed for CAT II.
(None, other) : Circuits which are not directly connected to the mains power supply.
O CAT II : Electrical circuits of equipment connected to an AC electrical outlet by a power cord. CAT III : Primary electrical circuits of the equipment connected directly to the distribution panel, and feeders from the distribution panel to outlets. CAT IV : The circuit from the service drop to the service entrance, and to the power meter and primary overcurrent protection device (distribution panel).
indicated on the Product, means that the user must refer to the related parts in the manual
is reserved for conditions and actions that are likely to cause serious or fatal injury.
is reserved for conditions and actions that can cause serious or fatal injury. is reserved for conditions and actions that can cause injury or instrument damage.
DANGER
The Product is to be used only in its intended applications or conditions. Otherwise, safety functions
equipped with the Product doesn’t work, and instrument damage or serious personal injury may occur. Verify proper operation on a known source before taking action as a result of the indication of the Product.
With attention to the measurement category to which the object under test belongs, do not make
measurements on a circuit in which the electrical potential exceeds the following values. * 300 V AC for CAT IV, 600 V AC for CAT III
Do not attempt to make measurement in the presence of flammable or explosive gasses, or in steam
environment.
Never attempt to use the Product if its surface or your hand is wet.
- Measurement -
Do not exceed the maximum allowable input of any measuring range.
Never open the battery compartment cover during a measurement.
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Safety warnings KEW5050
DANGER
- Voltage test lead -
Use only the ones supplied with the Product.
When the Product and the test lead are combined and used together, whichever lower category either of
them belongs to is applied. Confirm that the measured voltage ra ting of the te st lead is not exceeded .
Connect voltage test leads to the Product first, and only then connect them to the circuit under test.
Keep your fingers behind the barrier* during a measurement.
* Barrier provides protection against electrical shock and ensures the minimum required air and cr eepa ge d ist ance s.
Never disconnect the voltage test leads from the connectors of the Product during a measurement
(while the Product is energized).
Do not touch two lines under test with the metal tips of the test leads.
Never touch the metal tips of the test leads.
- Clamp sensor -
Use only the ones designed specially for the Product.
Ensure that sensor rating is appropriate for a current to be measured; voltage rating of the circuit under
test should not exceed the maximum rated voltage.
Ior leakage clamp sensors (KEW8177/ 8178) are rated to CAT III 300 V. The reference voltage input
terminals on the Product is rated to CAT IV 300 V, CAT III 600 V. The lower category rating is applied when using these sensors with the Product; be careful not to exceed CAT III 300 V.
Connect the sensors only required for the testing.
Connect sensors to the Product first, and only then connect them to the circuit under test.
Keep your fingers behind the barrier* during a measurement.
* Barrier provides protection against electrical shock and ensures the minimum required air and cr eepa ge d ist ance s.
Never disconnect the sensors from the connectors of the Product during a measurement
(while the Product is energized).
Connect to the secondary side of a circuit breaker; the primary side may have large current capacity and
may cause danger.
Do not touch two lines under test with the metal tips of the jaw.
- Battery -
Do not try to replace batteries during a measurement.
- AC adapter –
Ensure that the power cord and the AC adapter are firmly connected.
Use the power cord and the AC adapter MODEL8262 supplied with the Product.
The AC adapter is rated to 100 V AC – 240 V AC. When using MODEL7170 power cord, ensure that it
should be connected to 125 V AC or less.
The AC adapter frequency rating is 50/ 60Hz.
Always check the frequency rating is not exceeded, and do not connect to a circuit in which 240 V AC or
higher electrical potentials exist. Otherwise, it may damage the AC adapter or KEW5050 and electrical accidents may happen.
- Earth cable –
Use the supplied earth cable and connect the Product to a well-known earth terminal. Never connect the
earth cable to a live circuit to avoid damaging the Product and prevent electrical accidents; the cable isn’t protected against high voltage.
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KEW5050 Safety warnings
WARNING
Verify proper operation on a well-known source before starting to use the Product.
CAUTION
Examine the conductor under test before starting a test. It might be hot.
Do not apply current or voltage exceeding any measuring ranges for a long period.
Never apply voltage or current to voltage test leads or clamp sensors while the Product is off.
Do not use the Product at dusty places or to be spattered.
Keep away from a strong electric magnetic field or energized object.
Never give strong vibrations or drop shocks.
Insert an SD card to the slot with the correct orientation. If the card is inserted up-side-down, the SD
card or the Product may be damaged.
Do not replace or remove SD card while the Product is transferring or accessing information.
(The symbol blinks while accessing the SD card.) Otherwise, the saved data in the card may be lost or the Product may be damaged.
- Clamp sensor -
Do not bend or pull the cable of the clamp sensor.
- Battery -
Brand and type of the batteries to be used should be harmonized.
- Treatment after use -
Power off the Product and disconnect the power cord, voltage test leads and clamp sensors from
the Product.
Remove the batteries if the Product is to be stored and will not be in use for a long period.
Remove the SD card when carrying the Product.
Never give strong vibrations or drop shocks when carrying the Product.
Do not expose the Product to direct sunlight, high temperature, humidity or dew.
Use a damp cloth with neutral detergent or water for cleaning the Product. Do not use abrasives or solvents.
Dry and store the Product if it is wet.
Carefully read and follow the instructions: DANGER, WARNING, CAUTION and NOTE described in each section.
Meaning of symbols on the Product:
User must refer to the explanations in the instruction manual. Instrument with double or reinforced insulation
AC
Functional earth
Crossed-out wheel bin symbol (according to WEEE Directive: 2002/96/EC) indicating that this electrical product may not be treated as household waste, but that it must be collected and treated separa tely.
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1.1 Features KEW5050

1. Functional overview

Features

Description
KEW 5050 is an advanced LEAKAGE CURRENT LOGGER that is able to identify the resistive leaka ge current Ior in various wiring systems. The Ior is the dangerous component of the leakage current because Ior consumes power and then it can cause a rise in temperature that can lead to fire and electrical shock. KEW 5050 can simultaneously measure and record several parameters such as: Ior resistive leakage current, R Insulation Resistance b ased on Ior, lom and Io leakage current with and w ithou t ha rmonic co mpone nt s, Vm and V mains voltage with and withou t ha rmonic co mpon ents, θ phase difference and F mains frequency. KEW 5050 can measure instantaneous and even t val ues .
Wiring configuration
KEW 5050 supports single-phase 2-wire, single-phase 3-wire, three-phase 3-wire, three-phase 4-wire. The graphic display shows how to connect the KEW 5050 to the electrical installation under test according to the wiring configuration set. Vector diagram shown on display helps to check the correct orientation of the clamp sensors.
Less susceptible to harmonics
Measured value is determined on basic waveform of mains frequency by a unique calculation method. Thus, leakage current with harmonics does not affect the measured value. * Leakage current Trms ( Iom) and reference voltage Trms (Vm) values contain harmon ics.
Measurement at pre-set interval
Easy to find intermittent leakage current since KEW 5050 will measure and record data every 200 ms with gapless. If the selected interval is longer th an 2 00 ms, the max., min., average and in stan tane ous value s in the selected period will be saved a t the set in terva l.
Events detection
In case KEW 5050 detects a value of current / voltage larger (or lower) than the threshold values, it will record the value of detected current / vo ltage with da te and ti me bu t al so th e instan taneo us leakag e curren t.
Saving data
KEW 5050 has a logging function with user-selectable recording intervals. The saved data is stored in the SD card offering possible recording time up to several y ears. The start/stop of the logging can be done by manual or automatic operation. A useful Print Screen function allows the end use r to save display ed screens a s BMP files.
Vector diagram
Vector diagram of KEW 5050 graphically represents the phase relation between reference voltage (V) and leakage current (Io) on its display.
Dual power supply system
KEW 5050 operates either with AC power supply or with batte ry. AA alkaline d ry-cell battery (LR6) and AA Ni-MH rechargeable battery can both be used. * Rechargeable battery and specific charger are not supplied. If using rechargeable battery, use the charger which is manufactured by the same company as the battery. For safety reason, KEW 5050 does not charge rechargeable battery.
Data analysis
The saved data can be read by a P C or can be transferred to a PC via USB. Dedicated soft ware “KEW Windows for KEW5050” allows data analysis and the setup of KEW 5050 on a PC.
Signals output
KEW 5050 has digital output signals that can activate alarm devices w hen events occur. *Alarm devices are not supplied with KEW 5050.
Safety construction
KEW 5050 is designed to meet the International Safety Standard IEC 61010-1 CATIV 300V / CATIII 600V.
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KEW5050 1.2 Constructional drawing

Constructional drawing

Ref. voltage input
Current input
・・・
Connection terminal
Digital output to alarm devices
Earth cable
USB
Size AA alkaline battery LR6)
size AA Ni-MH battery (Ni-MH)
SD card
AC adapter
Outlet
PC
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1.3 Steps for measurement KEW5050

Steps for measurement
Read through the operating instructions described in “Safety Warnings” (P.7) before starting to use the Product.
Getting started
“5 Getting started” P. 27
Connect necessary cords and sensors to the Product
“5.4 Voltage test lead and Clamp sensor connection” P. 33
Power on the Product
“5.5 Start KEW5050 “ P. 34
Make settings for items common to all
“6.2 Basic setting” P. 41
Connect to a measurement line
“5.6 Connection to the measured object” P. 35
Check for connection
“Displaying vector diagram” P. 68
Read KEW5050 settings
“KEW5050 settings” P. 59
Make settings of measurement and data-saving method
“6.3 Event setting” P. 45/ “6.4 Recording setting P. 53
Check the space and data in SD card.
“Recorded data” P . 57/ “Measured values” P. 67
Start/ Stop recording
“5.7 Recording procedure” P. 38
View the occurred events.
“Displaying information on occurred event” P. 71
Disconnect the cords and sensors from measurement line, and
power off the Product.
Analyze data on PC.
“9.1 Data transfer to PC” P. 77
“10. PC software for setting and data analysis” P. 80
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KEW5050 2.1 Display(LCD)/ Keys

2. Product layout

Display(LCD)/ Keys
Display(LCD)
Keys
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2.2 Connector KEW5050

Connector
Reference voltage input
terminal (N(T), L(R))
Wiring configuration
Single-phase 2-wire 1P2W
Terminal cover
Current input terminal
(A1, A2, A3, A4)
Reference voltage input
terminal*1
Current input terminal (×number of systems*2)
N, L A1 to A4
Single-phase 3-wire 1P3W
Three-phase 3-wire 3P3W Three-phase 4-wire 3P4W Voltage, Current logging V, A
*1
Always connect the refe renc e voltage even w hen mea suring current on ly ; otherwise, measurement
errors increase and result in inaccurate measuremen t.
* 2
When measuring multiple systems simultaneously , connect the clamp sensors required for the
intended measurement only in order from A1.
N, L1 A1 to A4
T, R A1 to A4
N, R A1 to A4
N(T), L(R) A1 to A4
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KEW5050 2.3 Side face

Side face
< Connector cover closed >
USB port cover
< Connector cover opened >
USB ネクタ
Digital output cover
SD slot cover
出力端子
USB port
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SD card slot
Digital output
terminals

2.4 Voltage test lead and clamp sensor KEW5050

Connector for AC adapter
Voltage test lead and clamp sensor
*
<Alligator clip>
Tip of voltage test lead
<Clamp sensor>
Barrier
Barrier
Barrier is a mechanical safety part and provides protection against electrical shock and ensures the minimum required air and creepage distances. Keep y our finge rs and hand s behi nd the barrie r duri ng a me asure ment .
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KEW5050 3.1 Keys

3. Basic operations

Keys

PRINT SCREEN key
Save the currently displayed screen as BMP file.
DA TA HOLD/ KEY LOCK key
Hold the readings on the display.
* Measurement continues while the readings are being
held on the display.
Long press (at least 2 sec.) disables all keys to prevent unintentional operations. Another long press restores the disabled Keys.
Power on/ off the Product.
EVENT key
Show the event occurrence status.
SET UP key
Change and confirm the settings for wiring, basic items, measurement and recording, and edit the saved da ta.
POWER key
Green
Red Blink: Backlight is off.
ENTER key
Confirm the entries.
Cancel setting changes and return to the previous settings.
Light up: Recording/ measuring Blink: Stand-by
START/ STOP key
Cursor key
Select item or switch displays.
ESC key
Status LED
Start/ stop measurement.
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3.2 Icons on LCD KEW5050

Icons on LCD
Icons Description
The Product is operating with battery. This icon varies in 4 steps according to the battery power condition.
The Product is opera tin g w ith AC power supply.
Display is held.
Keys are locked.
SD card is accessible.
Recording data in the SD card.
Not enough storage space in the SD card.
Failed to access the SD card.
Stand-by state
Recording the measured values.
The SD card is full.
USB is available.

Symbols on LCD

Symbols displayed on the LCD
Leakage current (Trms) including
Iom
Vm
θ
R
A numbe r rep re senti ng CH numb er is added and di splay ed w ith abo ve sy mbol . If ju st the symbol is d ispla y ed, without a number, it means that the value is the sum of all CHs.
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harmonic components
Reference voltage (Trms)
including harmonic components
Phase angle
Insulation resistance
(Ref. value)
lagging leading
Indicates phase angle of leakage current Trms (Io), basic wave by regarding phase angle of reference voltage Trms (V), basic wave, as 0.0°. Shows insulation resistance values determined by the following formula.
Note:
Displayed value is just for reference since the measurement method differs from insulation resistance testers and may not be consistent with each other.
Leakage current (Trms) with
Io
basic wave of 50/ 60Hz only
Reference voltage (Trms) with
V
basic wave of 50/ 60Hz only
V: Reference voltage/ Ior: Leakage current (Trms, basic wave) (Trms, resistive components)
Leakage current (Trms) with
Ior
resistive components only
Frequency of reference
f
voltage
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KEW5050 3.4 Screens

Screens

Rough chart of available screens
Measured value Vector
Wiring diagram Detail setting
Event
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3.4 Screens KEW5050
Measured value (vector)
* Taking single-phase 2-wire as an example.
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KEW5050 3.4 Screens
Event
* The following examples show the status that all events are detected on four systems (A1 to A4)
: Switches displayed items.
+ : Moves black highlight to the items enclosed in “◀” “▶” marks.
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3.4 Screens KEW5050
Settings
: Switches the displayed items.
Press to toggle the screens.
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KEW5050 4.1 Leakage current (Io) measurement

4. Leakage current

In general, insulation monitoring devices measure le akage current (Io) and detect deterioration of insulation; however, the measured leakage current usually includes resistive leakage current (Ior) – potential causes of fire, electrical shock or power loss - and capacitiv e leakage current (Ioc) – usually not dangerous. Therefore, to diagnose insulation deterioration accurately on an electrical installation with large Ioc (e.g. installation with long wiring or with inverter devices) is difficult.
Example: Io on single-phase 2-wire Vector: Io = Ior + Ioc
Ior and voltage (V) flow in the same phase (no phase difference) and they can be converted to active power as follows.
Active power (P) = V x Ior x cos0° (cos0°= 1) = V × Ior
It means that Ior consumes power and then it can cause a rise in temperature that can lead to fire and electrical shock. <Why Ioc is not usually dangerou s? > On the other hand, Ioc leads the phase to voltage by 90° and can be converted to active power as follows.
Active power (P) = V x Ior x cos90° (cos90°= 0) = 0
The consumed Power of Ioc will be zero and then it can be ignored as no dangerous situations usually occur.
Ioc
Io
Ior
V
Leakage current (Io) measurement
To determine Io, harmonics are removed from the basic wave of leakage current (1st order of nomibal power frequency 50/ 60 Hz) using Fast Fourier transform (FFT).
Io = Io_kr
Where:
_kr: real number component after FFT, _ki: imaginary number component after FFT, and k = 1: FFT analysis order (1st order)
Io_ki
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4.2 Resistive leakage current (Ior) measurement KEW5050

Resistive leakage current (Ior) measurement
Single-phase 2-wire
To find Ior only, we determine active power (P) using Io and real and imaginary numbers of Trms reference voltage (V) at first, and then remove V.
P_k = V_kr×Io_kr+V_ki×Io_ki
_
Io_ki
V = Io_kr
Ior =
Where:
_kr: real number component after FFT, _ki: imaginary number component after FFT, and k = 1: FFT analysis order (1st order)
Single-phase 3-wire
Where:
Ior_L1 and Ior_L2 represent resistive leakage current in L1 and L2 phase, and Ioc_L1 and Ioc_L2 represent
capacitive leakage current in L1 and L2 phase respectively. Theoretically if insulation deterioration occurs in L1 and L2 phase simultaneously and in the same value, Ior is canceled because the voltage across L1 and L2 is always in opposite phase. But practically this is a ve ry ra re case; therefore, it is possible to test and judge the phase with relevant degraded insulation. The vector direction of Io helps to identify the phase with relevant degraded insulation. To find Ior only, we determine active power (P) using Io and real and imaginary numbers of Trms reference voltage (V) at first, and then remove V.
P_k = V_kr×Io_kr + V_ki×Io_ki
_
Io_ki
V = Io_kr Ior =
Where:
_kr: real number component after FFT, _ki: imaginary number component after FFT, and
k = 1: FFT analysis order (1st order)
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Ior
Io
V
Ioc
Ioc_L1
Ior
Io
Ior_L1
L1
V
L2
Ioc
Ior_L2
Ioc_L2
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KEW5050 4.2 Resistive leakage current (Ior) measurement
Three-phase 3-wire
In the above illustration, Ior_R and Ior_T represent resistive leakage current in R and T phase, and Ioc_R and Ioc_T represent capacitive leakage current in R and T phase respectively. First, find reactive power Q using Io and real and imaginary numbers of Trms reference voltage (V), and then remove V to find a reference value. Ior flows in the same phase as voltages flow in R and T phases. When Ioc_R and Ioc_T are balanced, Ioc flows in the reverse direction against V. The above figure shows relationship of each component in the form of vector. Use the following formula to find Ior.
Q_k = V_kr×Io_ki+V_ki×Io_kr
√
_
Io_ki
V = Io_kr
Ior =
Where:
_kr: real number component after FFT, _ki: imaginary number component after FFT, and
k = 1: FFT analysis order (1st order) The vector direction of Io helps to identify the phase with relevant degraded insulation. Note: When a vector of Io is between the vectors of Ioc_R and Io c_T, the relationship of current magnitude w ill be Ior≧Io≧(Q/ V). If Ioc_R and Ioc_T are unbalanced, measurement error occurs.
Ioc
T
Q/V
Io
Ioc_
Ioc_T
Ior_T
S
R
Io = Ior_T + Ior_R
Ior_R
V
Three-phase 4-wire
In the following illustration, Ior_R, Ior_S and Ior_T represent resistive leakage current in R, S and T phase, and Ioc_R, Ioc_S and Ioc_T represent capacitive leakage current in R, S and T phase respectively. When Ioc in each phase are balanced, the total lea kage current w ill be ze ro and can be ign ored . In th is case , Io and Ior are equal.
The vector direction of Io helps to identify the phase with relevant degraded insulation.
KEW5050 26
R
V
Io = Io
Ioc_R
Ior_T
T
Ior_R
Ioc_S
N
Ioc_T
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S

5.1 Attaching markers to clamp sensors KEW5050

Ior measurement on wiring with different capacities
Phases of Ior and Ioc may overlap when testing Delta, Op en Del ta/ V-connection three-phase sy stem s w ith different capacitie s. In su ch ca se s, r emo vin g Ioc from Io is impossible; therefore, Ior cannot be accurately measured. Leakage current doesn’t flow on the flowing power supply (not connected to earth ground) such as IT system; so also in this case Ior cannot be measured.

5. Getting started

Attaching markers to clamp sensors
Attach the color markers to clamp sensors for easy recognition. Colors of the marker are harmonized with that of current input terminals (red: A1, yellow: A2, blue: A3, green: A4). Supplied markers are 8 pcs in total (red, blue, yellow, green: 2 pcs each).
Color marker Attach to both ends of the sensor cable.
(2 pcs in each 4-color: 8 pcs)

Power supply

The Product operates with either AC power supply or battery. Capable of performing measurements in the event of AC power interruption, power to the Product is automatically restored by the batteries installed in the Product.
Battery
AA alkaline dry-cell battery (LR6) or AA Ni-MH battery can both be used. To charge rechargeable battery, use the charger which is manufactured by the same company as the battery. The Product cannot charge batteries. * Size AA alkaline dry-cell batteries (LR6) are supplied as accessories.
DANGER
Do not try to replace batteries during a measurement.
Never touch the connector of AC adapter while the Product is operating with batteries.
WARNING
Ensure that the power cord, voltage test leads and clamp sensors are removed from the Product, and that
the Product is switched off when opening the battery compartment cover for battery replacement.
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KEW5050 5.2Power supply
CAUTION
Brand and type of the batteries to be used should be harmonized.
Never mix new and old batteries.
Install batteries in correct polarity as marked inside the battery compartment area.
Note
Batteries are not installed in the Product at the time of purchase. Please insert the supplied batteries before starting to use the Product. Battery power is consumed even if the Product is being off. Remove all the batteries if the Product is to be stored and will not be in use for a long period.
How to install batteries
Screw
2 5
Battery compartment co ver 2 5
1
Disconnect AC adapter, earth cable, voltage test leads and clamp sensors from the Product, and
power off the Product.
2 Loosen two battery compartment cover-fixing screws and remove the cover. 3 Take out all the batteries. 4 Insert six batteries (size AA alkaline battery: LR6) in correct polarity. 5 Install the battery compartment cover and fix it with two screws.
AA Alkaline batteries (LR6)
3 4
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5.2 Power supply KEW5050
The battery indicator/ AC power icon
The battery indicator icon va rie s ac cordin g to t he bat tery co ndi tion ; the icon chan ge s to AC power icon when the Product is connected to AC power.
Powered by AC
Power supply icon
Powered by
battery
Possible continuous measurement hours:
- approx. 11 hours with size AA alkaline batteries, and
Remaining battery power
- approx. 9 hours with size AA Ni-MH (1900mA/h), fully charged batteries.
Note:
as the battery to charge rechargeable battery. Rechargeable batteries cannot be charged in the Product.
Enough for normal operation *These status indicators may appear when using ful ly­charged Ni-MH battery since the voltage of the battery is lower than that of alkaline battery.
Displayed in 4-level
Use the charger manufactured by the same company
Too low: Measurement continues, but data save stops. (A measurement in progress is saved until it ends.)
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KEW5050 5.2 Power supply
AC adapter
For a long period of logging, use the supplied AC adapter . It i s recommended to install batteries even while connecting the Product to mains outlet. Power to the Product is automatically restored by the installed batteries in the event of unexpected power interruption. The following tables show the ratings of AC adapter and power cord.
Always check the followings before plugging/unplug ging the AC adapter.
MODEL7170 Power cord
Rated supply voltage 125 V AC Rated supply current 7 A max
MODEL8262 AC adapter
Rated supply voltage 100 – 240 V AC (±10%)
Rated supply freq. 50/ 60Hz
Max power consumption 20 VA max.
DANGER
Use only the AC adapter and the power cord supplied w ith this Produ ct.
Never connect MODEL7170 power cord to a pow er supp ly of gre ater than 125 V AC.
Ensure that the rating suits the power supply voltage and the frequency to be used. Do not connect the AC
adapter to a power supply great er than 240 V AC (50/ 60Hz) otherwise it may damage th e adapter or the Product and cause electrical accident.
Connect the supplied earth cable to a well-known earth terminal to earth the Product. Ne ver conne ct
the earth cable to a live wire to avoid damaging the Product or to prevent electrical accident since the cable is not protected against high voltage.
WARNING
Power off the Product and connect the power cord.
Connect the power cord to the Product first, and then to an outlet. The cord shou ld be firml y connected .
Never attempt to make measurement if any abnormal conditions are noted, such as cracks or exposed metal
parts.
Disconnect the power cord from the ou tlet when the Product is not in use.
When unplugging the power cord fro m th e outle t, do so by removing the plug first and no t by pulling the co rd.
Note
Always connect the supplied earth cable when using the AC adapter and make measurements to stabilize the readings.
Use of AC adap te r to su pply pow er to the Produ ct can conserve ba ttery li fe.
The Product shuts off in the event of sudden power interruption and data may be lost if no batteries are
installed in the Product.
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5.2 Power supply KEW5050
AC adapter connection
Follow the procedure below and connec t the AC adapter to the Product.
1 Confirm that the Product is powered off. 2 Firmly connect the power cord to the AC adapter. 3 Connect the output terminal of the AC adapter to the female connector of the earth cable. 4 Firmly connect the connection terminal of earth cable to the AC adapter connector on the Product.
*
Direct connection of AC adap ter to the Product – insert the output terminal of AC adapter to the connector
for AC adapter on the Prod uct – is allow ed where the Produ ct is connected to a PC for data a nalysis and
performs no measurements.
5 Connect the clip of the earth cable to a well-known earth terminal.
6 Connect the power cord to an outlet.
Clip of earth cable
5
DANGER:
connected is surely the ear th term inal. Never connect to a live conductor.
Connection terminal
Always check and confirm the terminal to be
1 KEW5050
3
Output terminal of
AC adapter
4
Connection terminal of
Earth cable
2 Power cord
AC adapter 2
The Product can derive power from a measurement line of 240 V or less to ground by using an optional power adapter, MODEL8329. For further detail, see “9.3 Getting power from measured line” (P. 78).
Power cord
Outlet
6
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KEW5050 5.3 Placing/ removing SD card

Placing/ removing SD card
Check the following points before using SD card.
CAUTION
Follow the instructions described below and insert the SD card into the slot with the correct orientation. Inserting the card with incorrect orientation may damage the card itself or the Product.
Do not replace or remove the SD card while accessing to the card; otherwise, the saved data in the card may be lost or the Product may be damaged. The symbol blinks while accessing to the card.
Do not remove the SD card while symbol is blinking, otherwise the saved data or the Product may be damaged. Before removing the card, stop recording and confirm that the LCD shows “Recording stopped.”.
Note
Use the SD card supplied with the Product or the one supplied as optional parts.
Newly purchased SD card must be formatted on the Product before use. Data might not be successfully
saved on an SD card formatted on a PC. For the details, please refer to “Format” (P .58) in this manual.
If the SD card has been frequently used for a long period, the flash memory may be exhausted and further data may not be saved on it. In such a case, please use another new card.
The data in the SD card might be damaged or lost by accident or failure. It is recommended to back up the
recorded data periodically. Kyoritsu will not be liable fo r any loss of data or any other dam age s or losses.
Inserting SD card
1 Open the connector cover. 2 Insert the SD card into the SD card slot with the topside turned up. 3 Close the cover. Do not leave the cover open unless it is necessary to do so.
Removing SD card
1 Open the connector cover. 2 Gently push the SD card towards inside, and then the card comes out. 3 Remove the card slowly . 4 Close the cover. Do not leave the cover open unless it is necessary to do so.
SD card
Connector cover
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5.4 Voltage test lead and Clamp sensor connection KEW5050

Voltage test lead and Clamp sensor connection
Check the following before connecting the test leads and sensors.
DANGER
Use only the voltage test leads supplied with the Product.
Use the clamp sensors designed for the Product. Ensure that the rating of the sensors suits the measurement
current.
Connect the clamp sensors only required for a measurement.
Connect the test leads and sensors to the Product first, and only then connect them to the circuit under test.
Never disconnect the test leads and sensors during a measurement - while the Product is supplied from the
measurement line.
WARNING
Confirm that the Product is powered off, and then connect voltage test leads and clamp sensors.
Connect the test leads and sensors firmly to the Product first and then to the object to be tested.
Never attempt to make measuremen t if any abn ormal cond ition s a re no ted, su ch as crac ks or exposed metal
parts.
Follow the procedure below, and connect the voltage test leads and clamp sensors. 1 Confirm that the Product is powered off. 2 Connect a voltage test lead to the reference voltage input terminal on the Product. 3 Connect the necessary clamp sensors to the current input terminal on the Product. Match the direction of the arrow mark on the output terminal of the clamp sensor and the mark on the current input terminal on the Product.
      
Number of clamp sensors to be used varies depending on the wiring configuration under test. See “Wiring diagrams” (P.37) in this manual.
33 KEW5050
Match the arrow marks.
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KEW5050 5.5 Start KEW5050

Start KEW5050
Start-up screen
Note:
The key doesn’t turn off the Product while symbol stays on the LCD; key lock function is enabled. Hold down key at least 2 sec. and confirm symbol disappears, and then hold down key 2 sec. or longer to turn off the Product.
Hold down least 2 sec.
1 Model name and software version will be displayed upon powering on the Product. Stop using the
Product if it does not get started properly, and refer to “11. Troubleshooting” (P. 89) in this manual.
2 A screen to show measured value s app ears fo llow ed by the start-up scree n.
key until the following screen is displayed. To power off the Product, hold down key at
Model name
Version info.
Serial No.
Cautionary message
If the connected clamp sensors are not the same ones us ed at the previous test, the LCD shows the sens ors currently connected, serial no. and phase correction values five sec. Correct the displayed information if it doesn’t conform to the present connection. Press to move to “Basic setting”.
Note:
When using general purpose leakage clamp sensor or load current clamp sensor, manual configuration is required. Press to move to “Basic setting”.
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5.6 Connection to the measured object KEW5050

Connection to the measured object
Read the following precautions prior to making connection.
DANGER
The voltage to ground rating of the Product is 300 V AC for CAT IV and 600 V AC for CAT III max. Do not make measurements on a circuit in which the higher electrical potentials exist.
Use the voltage test leads and clamp sensors designed specially for the Product.
The voltage to ground rating of the supplied clamp sensors is 300 V AC for CAT III max. The rating differs
from the one of reference voltage input term inal on the Prod uct. Always check and confirm that the rating suits the measurement voltage.
Connect the clamp sensors, voltage test leads and power cord to the Product first, and then connect to the
object to be measured or the power source.
When the Product and the test lead are combined and used together, whichever lower category either of
them belongs to will be applied. Confirm that the voltage rating of the test lead is not exceeded.
Do not connect unneccesary voltage test leads or clamp sensors to the Product.
Clamp sensors should always be connected on the downstream side of a circuit breaker, which is safer than
the upstream side.
Do not open-circuit the secondary side of a supplementary CT while it is energized; otherwise, high voltage will be generated at the secondary side te rminal .
Be careful to avoid short-circuiting the power line with the un-insulated part of the voltage test leads. Do not touch the tip metal part.
Transformer jaw tips are designed in such a way to avoid short-circuiting; however, extra care should be taken to minimize the possibility of shorting when measuring un-insulated conductors.
Keep your fingers behind the barrie r during a measuremen t.
Barrier provides protection against electrical shock and ensures the minimum required air and creepage
*
distances.
Never disconnect test leads or sensors from the connectors on the Product during a measur ement (while the Product is energized).
Do not touch two lines unde r test w ith the me tal tip s w hen op ening the jaw s.
WARNING
To avoid possible electric shock and short-circuit, always turn off the measurement line under test at connection.
Do not touch the un-insulated tip of voltage test leads.
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KEW5050 5.6 Connection to the measured object
Connection method (Selecting wiring system: Wiring diagram)
Press to show the wiring diagram corresponding to the curr ent settings. Use to toggle the
types of wiring system and to change the number of system. Connect the necessary clamp sensors and voltage test leads according to the displayed wiring diagram, and then press to move to “Basic
setting” screen to reflect the selection. The selection won’t be reflected by pressing .
Note:
Always connect voltage test le ads ev en w hen measu ring cu rren t only to cal cula te the me asured va lu es at proper timing and stabilize the readings.
Phases of Ior and Ioc may overlap when testing Delta, Open Delt a/ V-connection three-phase s ystems wit h different capacities. In such cases, removing Ioc from Io is impossibl e; therefore, Ior cannot b e accurately measured. Leakage current does n’t flow on the fl owing po wer supply (n ot connected to earth gr ound) such as IT system; so also in this case Ior cannot be measured.
For accurate measurement
Confirm that the configuration of wiring system suits the measurement line.
Ensure that the arrow mark on the clamp sensor points towards load side (towards neutral at earth line
measurement).
When measuring earth line/ A (Load curren t) X 1 - 4 1P2W (Single-phase 2-wire) X 1 - 4 : clamp onto L and N lin es
Neutral/ Load
Load
Power source
Arrow mark: Neutral/ Load side
Arrow mark: Load side
Power source
1P3W (Single-phase 3-wire) X 1 - 4: clamp on to L1, L2 an d N 3P4W (Three-phase 4-wire) X 1 - 4: 3P3W (Three-phase 3-wire) X 1 - 4 : clamp onto R, S and T clamp onto L1, L2, L3 and N
Load
Load
Power source
Arrow mark: Load side
Power source
Arrow mark: Load side
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5.6 Connection to the measured object KEW5050
Wiring diagram
Detail
Load current,
voltage logger(A)
× 1 – 4 systems
Single-phase
2-wire (1P2W)
× 1 – 4 systems
Single-phase
3-wire (1P3W)
× 1 – 4 systems
*
: default setting
3-wire (3P3W)
× 1 – 4 systems
Three-phase
Three-phase
4-wire (3P4W)
× 1 – 4 systems
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KEW5050 5.7 Recording procedure

Recording procedure

How to start recording
Press .
The LCD shows the currently applied recording settings before a start of recording. Select with the displayed settings. To change the settings, select Always check and follow the safety precautions and do proper preparation before starting measurement.
: Move the highlight to
How to stop recording
Press .
Cancel/ Start
to start recording
Start
and press to change the settings.
Cancel
Confirm Cancel
Data number
Recording method
Events to be recorded
Data No. Data no. of the recorded data. It is also used as a folder name to save data.
Elapsed time The time that elapsed while recording.
Manual Shows recording start date and time.
Recording method
REC Event Events to be recorded and comp ared with criteria of judgement.
Move the highlight to
KEW5050 38
Constant Shows recording start/ stop date and time.
Time period
Shows recording period and time.
Cancel/ Stop
Confirm Cancel
Displayed items
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6. Settings KEW5050

6. Settings

Before starting a measurement, make settings for measurement conditions and data saving.
Press and show the wiring diagram screen first. Select an appropriate diagram and press
to proceed with detail settings. Press or to return to the previous screen.
Moving the highlighted cursor
Basically, is to move the highlighted cursor, is to confirm the change/ selection, is to
return to the previous settings. The following example shows how to make settings for current clamp sensors. The other input operations are basically the same.
The item with white text with black background indicates the item currently selected.
In this example, press
to confirm the selection. Press
If the display of the selectable items is like the one shown to the left, the highlighted
cursor can move to up, down, right and left. Use
to be connected, and then press to confirm. To return to the previous scree n and cancel the changes, press the
To alter the numbers such as serial no., date and time, move the highlighted cursor with keys and alter the number with keys. In the example shown to the left, the hundreds place of serial no. is being selected. The number can be increased or decreased by 1 with
or press
key to return to the previous screen without making changes.
to move the highlight to select a clamp for each CH and
to return to the previous screen.
keys and select the sensor
key .
keys. Press
to confirm the selection,
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KEW5050 6.1 Detail settings

Detail settings
Detail settings consist of the following five items. Use keys to move between screens.
Note
Press and move to another screen to reflect changes in settings. Turning off the Product without moving screens doesn’t change settings.
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6.2 Basic setting KEW5050

Basic setting
Use to move to “Basic setting” tab.
Sensor recognition
Auto-configuration works only for Ior leakage clamp sensor
Connect Ior leakage clamp sensor(s) to the Product and perform sensor detection. Type of the sensor, serial no. and phase correction value are automatically updated. If the connected sensors are not the same ones used at the previous test, “!” symbol is displayed to the left of the CH number.
Manual configuration is required for general purpose leakage clamp sensor or load current clamp sensor; the settings aren’t updated automatically.
Press to move to “
41 KEW5050
Start sensor detection/ Cancel
Detect
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KEW5050 6.2Basic setting
Check the followings if sensor detection failed.
Check Remedies
Type of current
clamp sensor
???
(Identification error)
KEW5050 automatically identifie s Io r leakag e cl a mp senso rs only. Manual configuration is required w hen using gene ra l purpo se le akage cl amp sen sor or load current clamp sensor.
- Current clamp sensors are firmly connected to the Product?
- If any failure is in doubt: Disconnect the sensor, for which "NG" is given and connect to the different CH
on which another sensor is prop erly detected. If the result "NG" is given for the same CH, a defect of the Product is suspected. A defect of sensor itself is suspected if "NG" is given for the sam e sensor. Stop using the Product and the sensor, if any defects are in doubt.
Current clamp sensor/ ch
Follow the procedure below and make detailed settings for current clamp sensor.
Select a CH.
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6.2 Basic setting KEW5050
Clamp sensor
Select the model name of the sensor t o be used. When locating the hi ghlighted cursor to any of the l isted clamp sensors, rate current and conductor size information are displayed for easy recognition.
Selection Ior leakage clamp sensor 8177/8178 :10.000mA/100.00mA/1000.0mA/10.000A/AUTO General purpose leakage clamp sensor 8146/8147/8148 :10.000mA/100.00mA/1000.0mA/10.000A/AUTO
8141/8142/8143 :5.000mA/50.00mA/500.0mA/1.000A/AUTO Load current clamp sensor 8128 :500.0mA/5.000A/50.00A/AUTO
8121/8127 :1000mA/10.00A/100.0A/AUTO 8126 :2.000A/20.00A/200.0A/AUTO 8122/8125 :5.000A/50.00A/500.0A/AUTO 8123/8124/8130 :10.00A/100.0A/1000A/AUTO 8129 :300.0A/1000A/3000A
*
: default setting
Move the highlight to “
Confirm/ Cancel
Clamp
”.
Display a list of sensors
.
Select a sensor.
Range
Select a desired current range.
Note
When “AUTO” is set, event detection on the subjected CH is automatically set to “OFF”. Select a fixed range to enable the event detection fun ction .
Move the highlight to “
Confirm/
”. Show the pull-down menu. Select a range.
Range
Cancel
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KEW5050 6.2Basic setting
Serial No.
Leakage current clamp sensors used for a measurement can be searched on the application by registering a serial no. of the sensor beforehand.
Ior leakage clamp sensor
Serial no. is automatically registered when connected to the Product and do sensor detection, or power on the Product or start recording. The serial numbers, which have already been registered, are selectable from the list. The registered serial no. cannot be cleared.
General purpose leakage clamp sensor
First, select “New” and then enter the number labeled on the sensor. The entered number is selectable from the list. After entering the number, the currently selected number (serial no. of currently selected general purpose leakage clamp sensor) can be cleared; move down the highlight to “Delete serial number”.
Load current clamp sensor
Cannot enter serial number of load current clamp sensor. No entry window opens.
Move the highlight to “Serial No.”
“New”, Enter a serial no.
*
: default setting
New/ Registered serial number(s)
Select a serial no. Confirm/ Cancel
Selection
0001 - 9999
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6.3 Event setting KEW5050

Frequency
Choose the nominal frequency of the system to be measur ed. If vol tage freq uen cy is unce rtain; fo r exampl e, in the event of power interruption, the Product performs measurements based on the preset nominal frequency.
Selection
50Hz/ 60Hz
*
: default setting
Move the highlight to “
Select a frequency.
Event setting
Nominal f
Confirm/
Show the pull-down menu.
Cancel
Use to move to “Event” tab.
Common settings to all events
Hysteresis
Set a desired hysteresis in percentage to disable the event detection in the specific area. Setting a proper hysteresis will be helpful to prevent unnecessary detection of events which are caused by voltage or current fluctuations around the threshold values.
Selection
1 - 10% against threshold value (5%)
Move the highlight to “
Enter hysteresis value (%).
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Hysteresis
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*
: default setting
.
Show the value entry window.*
* A pop-up appears and show the effective range.
Confirm/ Cancel
KEW5050 6.3Event setting
Upper threshold value (H)/ ch
The following shows how to set upper threshold values.
Choose an item.
Selection
RMS leakage current (rms) :Iom
RMS reference voltage :Vm
Upper TH (H):
Leakage current :Io
Resistive leakage current :Ior
Reference voltage :V
Trigger
Choose and set “ON” to enter threshol d value for each ev ent. The event with “ON” setting is applie d to all CHs. To disable event detection on a certain CH, set the Curr ent range to “AUTO” or adjust the threshold value for the subjected CH.
Note
While Current range setting has been set to “AUTO”, “ON” cannot be set for current-related event. Choose an appropriate current range, and then select “ON”.
Selection
ON/ OFF
*
: default setting
Move the highlight to “
Confirm/ Cancel
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”. Show the selection window. Select ON/ OFF .
Trigger
6.3 Event setting KEW5050
ch
Set the upper Trms threshold value, which is determined at ever y 200 ms, to the m ax val ue of each ra nge. For this threshold value, the pre-set hysteresis value is applied.
Note
Upper threshold values for T rms leakage current is set in percentage against each current range; therefore,
current value for the threshold value c hanges if Current range settings are c hanged. Reference voltage range is fixed to 1000V.
Selection
0 - 100% against voltage range (100%)
0 - 11 0% again st cu rren t range (1 00%)
*
: default setting
Move the highlight to a desired CH.
* A pop-up appears and show the effective range.
Show the value entry window .*
Enter values. Confirm/ Cancel
Detection example: * Trms values measured at every 200ms (50 /60Hz: 10 /12- cycle )
Current, voltage
waveform
Threshold value
waveform
Trms
Trms valueTrms value
Trms value
~~~
Trms value
Hysteresis
・・・(n)
(n)
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KEW5050 6.3Event setting
Lower threshold value (L)
The following shows how to set lower threshold values.
Lower TH (L):
Choose an item.
Selection
Trms reference voltage :Vm
Reference voltage :V
Trigger
Choose and set “ON” to enter threshold value for each event.
Selection
ON/OFF
*
: default setting
Move the highlight to “
”. Show the selection window . Select ON/ OFF.
Trigger
Confirm/ Cancel
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6.3 Event setting KEW5050
Vm:/V:
Set the lower threshold value of reference v oltage, which is d etermined at e very 200 ms, to th e max value (1000V) of the range. For this threshold value, the pre-set hysteresis value is applied.
Selection
0 - 100% against the range (5%)
*
: default setting
Move the highlight to the event item.
Show the value entry window.*
* A pop-up appears and show the effective range with Trms value.
Enter a percentage against max value of the range.
Detection example: * Trms values measu red a t every 200 ms (5 0/60H z: 10/12 -cycle )
Voltage
waveform
Trms waveform
Threshold value
Trms value
Trms value
Trms value
~~~
Hysteresis
Trms value (n)
・・・(n)
Confirm/ Cancel
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KEW5050 6.3Event setting
Peak threshold value (Pk)/ch
The following shows how to set peak threshold values.
Choose an item.
Selection
Peak TH (Pk):
Trms leakage current :Iom
Trms reference voltage :Vm
Trigger
Choose and set “ON” to enter threshol d value for each ev ent. The event with “ON” setting is applie d to all CHs. To disable event detection on a certain CH, set the Curr ent range to “AUTO” or adjust the threshold value for the subjected CH.
Note
While Current range setting has been set to “AUTO”, “ON” cannot be set for current-related event. Choose an appropriate fixed current range, and then select “ON”.
Selection
ON/ OFF
*
: default setting
Move the highlight to “
Confirm/ Cancel
”. Show the selection window . Select ON/ OFF.
Trigger
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6.3 Event setting KEW5050
Iom, ch: / Vm:
Set threshold values for leakage current and reference voltage by setting instantaneous current and voltage peak values.
Note
Threshold current value changes to 200%Apeak of the ra nge w hen curren t ra nge se tting s are change d. Reference voltage range is fixed to 1000V.
Selection
Iom: 1.5%Apeak(1mA) - 200%Ap eak(20 0%Ap eak) to cu rrent ra nge Vm: 50 V - 2000 Vpeak(2000Vpeak)
*
: default setting
Move the highlight to a de sired CH.
* A pop-up appears and show the effective range.
Enter a voltage peak value.
Move the highlight to the event item. Show the value entry window.*
* A pop-up appears and show the effective range with Trms value.
Enter a voltage peak value.
Confirm/ Cancel
Confirm/ Cancel
Show the value entry window.*
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KEW5050 6.3Event setting
Peak threshold value Trms leakage current (Iom), Trms reference voltage (Vm)
Set threshold values for leakage current and reference voltage by setting instantaneous current and voltage peak values.
Selection
Iom: 1.5%Apeak(1mA) - 200%Ap eak (20 0%Ape ak) to cu rren t range Vm: 50 V - 2000 Vpeak (2000Vpeak)
*
: default setting
Move the highlight to a desired CH.
Enter a voltage value.
Show the value entry window.*
* A pop-up appears and show the effective range.
Confirm/ Cancel
Detection example
Current/ voltage
waveform
Threshold value (current, voltage)
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6.4 Recording setting KEW5050

Recording setting
Use to move to “Recording” tab.
Recording method
Interval
Set the interval to record the measured data on the SD card. Twelve different intervals are available.
Selection
200 ms/ 400 ms / 1 sec/ 5 sec/ 15 sec/ 30 sec/
1 min/ 5 min / 15 min /30 min / 1 hour/ 2 hours
*
: default setting
Move the highlight to “
Select a desired interval.
Interval
.
Show the selection window.
Confirm/ Cancel
Start recording
Select the method to start recording.
Selection
Manual/ Constant./ Time period.
*
: default setting
Move the highlight to “
Select a desired recording start method.
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Start
Show the pull-down menu.
Confirm/ Cancel
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KEW5050 6.4Recording setting
“Manual”
Start/ stop the recording with key.
“Constant”: Constant recording
Measured data will be recorded continuously at the preset in terval during the specified start/ stop time and da te.
Selection
Start time and date Day/ Month/ Year Hour: Minute (00/00/0000 00:00) Stop time and date Day/ Month/ Year Hour: Minute (00/00/0000 00:00)
Move the highlight to “
Specify the time and date.
When the time period is specified as below, the recording period will be from 6:10 am May 30, 2017 to 10:20 am June 10, 2017.
Start
”/ “
Stop
”.
Show the entry windo w.
Confirm/ Cancel
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6.4 Recording setting KEW5050
“Time period”: Time period recording
Measured data will be recorded at th e preset interval fo r the specified time pe riod of the selected period . When the specified time comes, a recording will start and stop automatically; such a recording cycle will be repeated every day during the specifie d pe ri od.
Selection
REC Period Start-Stop Day/ Month/ Year (DD/ MM/ YYYY) - Day/ Month/ Year (DD/ MM/ YYYY) REC Time Start-Stop Hour:Minute (hh:mm) - Hour:Minute(hh:mm)
Move the highlight to “
Confirm/ Cancel
Specify the time.
When the period and time are specified as below, the Product records the results from 6:10 am to 8:30 am every day from May 20, 2017 through June 10, 2017. In th e time other than sp ecified abo ve, no recor ding is performed.
Period
”.
Show the entry window.
Move the highlight to “
Confirm/ Cancel
”.
Time
Specify the date.
Show the entry window .
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KEW5050 6.4Recording setting
Possible recording time
Note
Use the SD card supplied with the Product o r the one suppli ed as option al pa rts.
Newly purchased SD cards must be formatted on t he Product b efore use. Dat a might not be s uccessful ly
saved on SD card formatted on a PC. For the details, please refer to “Format” (P. 58) in this manual.
Remaining recording time length varie s depending on the volume of recorded e vents. Event data up to 1GB
can be saved on the SD card per recording.
The following table show s possible recording time leng th when using a 2GB SD. (No event re cording.) These are just reference values since measurement con ditions or environment affect the pos sible recording time length. When setting the interval to 400 ms not only instantaneous valu e but also average, max, and min values are recorded; thus, possible recording time becomes shorter than the one with 200 ms interval setting.
Interval Possible recording time
200 ms 7 days 400 ms 3 days
1 sec 9 days
5 sec 6.7 months 15 sec 20 months 30 sec 40 months
1 min 6.7 years or more
5 min 33 years or more 15 min 100 years or more 30 min
200 years or more 1 hour
2 hours
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6.5Saved data KEW5050

Saved data

Use to move to “Saved data” tab.
Recorded data
Select a desired item. Confirm
“Check free memory space”
Checking the available space in the SD card which has been set in the Product.
Press to return to “Saved data” screen.
Displayed items Description
Capacity
Possible recording time
Total size Total memory capacity
Free size Capacity of free space
Estimated possible recording time with the present interval settings.
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KEW5050 6.5Saved data
”Delete data”
Select and delete unnecessary files. Select a file with refer ence to the d ate info displ ayed to the ri ght of the file name. Files are listed in random order. Each prefix of file name indicates the type of the data: S0001 – 9999 for measurement data, PS-SD000 – 999 for screenshot and SUPS0000 – 9999 for KEW5050 settings. The scroll bar is displayed when the list of the recorded data exceeds the display area.
Check box Scroll bar
Move the highlight and select a file to delete. Check the box.
Confirmation message appears. Select Yes/ No.
Confirm/ Close the list and returns to “Saved data” screen.
When pressing the file is being selected. Multiple files can be selected at once.
and select a file to delete, the corresponding checkbox is checked to indicate
/ Uncheck
”Format”
Format the SD card. Formatting is to comp le tely era ses al l data on the card . The scroll bar is displayed when the list of the recorded data exceeds the display area.
Scroll bar
Confirmation message appears. Select Yes/ No.
Confirm/ Close the list and return to “Saved data” screen.
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6.5Saved data KEW5050
KEW5050 settings
Select a desired item. Confirm
Save settings
Save KEW5050 setting data, SUPS0000 – 9999, on the SD card. Data is listed in random order. The scroll bar is displayed when the list of the recorded data exceeds the display area.
Scroll bar
Confirmation message appears. Select Y es/ No.
Confirm/ Close the list and return to “Saved data” screen.
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KEW5050 6.5Saved data
KEW5050 retains the following configurations.
Basic setting
Setting item
Wiring
Clamp/ Serial no./ Current range
Frequency
Other settings
Environment Date format
KEW5050
setting
Event setting
Setting item
Hysteresis:
leakage current: Iom ON/OFF threshold for 1-4ch
Trms
Trms reference voltage: Vm ON/OFF threshold
Upper TH (H):
Lower TH (L):
Peak TH (Pk):
Leakage current: Io ON/OFF threshold for 1-4ch
Resistive leakage: Ior
current
Reference voltage: V ON/OFF threshold
Trms reference voltage
Reference voltage: V ON/OFF threshold
Trms leakage current: Iom ON/OFF threshold for 1-4ch
Trms reference voltage: Vm
: Vm ON/OFF threshold
ON/OFF threshold for 1-4ch
ON/OFF threshold
Recording setting
Setting item
Recording
method
Constant
Time period
Period Start – Stop
Interval
Start Start Stop
Time Start – Stop
Setting item
ID number
Buzzer
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6.5Saved data KEW5050
“Read settings”
Read KEW5050 setting data, SUPS0000 – 9999, from the SD card. Data is listed in random order. Select a desired file with reference to the date information displayed to the right of the file name. The scroll bar is displayed when the list of the recorded d ata exceed s th e display a rea.
Scroll bar
Select a file to transfer. Confirmation message appears. Select Yes/ No.
Confirm/ Close the list and returns to “Saved data” screen.
T ypes of saved data
Data file handling
The file name will be assigned automatically. File no. is kept and saved, even after powering off the Product, until the system is reset. The file number will increase until it exceeds the max file number.
Note
If a file with the same file name already exists on the SD card, the files in the data folder will be saved as another name with a different file number; however, “print screen” and “KEW5050 setting” files will be overwritten in such a case. Attention should be paid so as not to duplicate the same file names after system reset (file number starts from “0”) or when one same SD is used for multiple KEW5050 units. When all the file numbers (S0000 – S9999) are used for each type of data, the files on the data folder will be overwritten.
The Product cannot handle the files or folders which are delete d, renamed or saved on a PC; moreover, such files or folders cannot be analyzed with the special software. Please do not change the name of folder or file.
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KEW5050 6.5Saved data
“Print screen”
Press
to save the screen images as BMP files.
File name: PS-SD 000 .BMP
File no.
(000 - 999)
“KEW5050 Setting”
Press
and move to “Saved data” tab, and then select “Save Settings”.
File name: SUPS 0000 .KEW | File no.
(0000 - 9999)
“Data folder”
New folder will be created per me asure ment to save the me a sured da ta.
Folder name:/KEW/ S0000
|
File no.
(0000 - 9999)
| |
Extension (BMP file)
“Measured data”
KEW5050 setting data* File name: INIS 0000 .KEW
Interval data DATS
Event data EVTS
|
*(at the start of recording)
File no.
(0000 - 9999)
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6.6Others KEW5050

Others

Use to move to “Others” tab.
Environmental settings
“Language”
Select the language to be displayed.
Selection
Japanese/ English
* Default setting is highlighted in gray. Changes made by user will remain after system reset.
Move the highlight to “Language”. Show the pull-down menu. Select a
desired language.
Confirm/
Cancel
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KEW5050 6.6 Others
“Date format”
Select a desired date display format. The selected date format will be reflected to all the displayed screens and on each setting window.
Selection
YYYY/MM/DD / MM/DD/YYYY / DD/MM/YYYY
* Default setting is highlighted in gray. KEW5050 retains changes made by user even after system reset.
Move the highlight to “
Select a desired date format.
Date format
”.
KEW5050 system settings
“Tim e”
Adjust and set the internal system clock.
Show the pull-down menu.
Confirm/
Selection
Cancel
dd/ mm/ yyyy hh:mm
* The selected date format is reflected to the input format.
Move the highlight to “
Adjust the date and time.
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Time
”.
Show the entry window.
Confirm/
Cancel
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6.6Others KEW5050
“ID Number”
Assign an ID number for the unit. Assigning ID numbers will be helpful when usin g multiple units at the same time, measuring multiple systems periodically with one unit and analyzing the recorded data.
Selection
00-001 to 99-999
*
: default setting
Move the highlight to “
Enter an ID number.
ID Number
”.
Show the value entry window.
Confirm/
Cancel
“Buzzer”
Mute the keypad sound. This setting doesn’t affect a waning buzzer for low battery power.
Selection
On/ Off
*
: default setting
Move the highlight to “
Confirm/ Cancel
”. Show the pull-down menu.
Buzzer
Select On/ Off.
“Auto power off”
Select to enable or disable the auto-power-off function. While the Product is operating with batteries, “Disable” cannot be set to save battery life.
For: Selection
AC Power 5 min./ Disable
Battery 2 min. (fix)
*
: default setting
Move the highlight to “
Select to disable/ enable auto-power-of f. Confirm/ Cancel
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”.
Show the pull-dow n me nu.
KEW5050 6.6 Others
“Backlight off”
Select to turn off/ not to turn off the backlight automatically when a certain time passes after the last key operation. While the Product is operating with batteries, “Disable” cannot be set to save battery life.
For: Selectio n
AC Power 5 min./ Disable
Battery 2 min. (fix)
*
: default setting
Move the highlight to “
Select to disable/ enable auto-off.
Backlight off
”.
Show the pull-down menu.
Confirm/ Cancel
“System reset”
Restore all the settings to default except for “Language”, “Date format” and “Time”.
Move the highlight to “System reset”.
Select “Yes” or “No”.
Confirmation message appears.
Confirm/ Cancel
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7.1Measured values KEW5050

7. Displayed Items

Measured values

List display of measured values by system
Measured values per system is displayed on one screen. If measurements are done on multiple systems, the result of entire system is displayed first.
List display
Example: 3P3W (Three-phase 3-wire, 1-system)
* On a wiring system of 3P3W, Ior is bigger than Io if Io flows in the phase between R and T phase voltages. * The number following alphabets indicates the system number.
Symbols displayed on the LCD
Io
Iom
R
V
leakage current with basic wave of
Trms
50/ 60Hz only
leakage current including harmonic
Trms
components
Insulation resistance V: Reference voltage (
Note:
resistance testers and may not be consistent with each other
Trms
wave of 50/ 60Hz only
is determined by
Trms
, basic wave)/ Ior: Leakage current (
Displayed value is just for reference since the measurement method differs from insulation
reference voltage (Trms) with basic
Ior
f
leakage current with resistive
Trms
components only
Frequency of reference voltage
Trms
, resistive components)
“Switching the displayed systems”
Press to toggle the screen to view the measurements on each system.
”Showing vector diagram for each system”
Press to show a vector diagram.
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KEW5050 7.1Measured values
Displaying vector diagram
Vector diagram for each system is displayed on one screen.
V ector diagram
Example: 3P3W (Three-phase 3-wire)
Solid line “V” ( ) Vector of reference voltage basic waveform Solid line”Io” ( ) Vector of Trms leakage current (basic waveform) Dotted line ( ) Other voltage except for reference voltage basic waveform Arc θ ( ) Phase angle
* The number following alphabets indicates the system number.
Symbols displayed on the LCD
Trms leakage current including harmonic
Iom
components
θ Phase angle
* vector line indicating Ior phase angle
0 to +180 0 to -180
leading
lagging
Phase angle of the basic wave of leakage current: phase angle of the basic wave of reference voltage is regarded as 0°.
Vm
Trms
reference voltage
components
including harmonic
Vector diagrams will be as follows where there are no resistive c apacitance components, and volta ge and current are balanced. If the phase of Io is outside of the following range, orientation of clamp sensor or polarity of alligator clip may be incorre ct.
* Regarding reference voltage (V) as 0°
1P2W
V Io
0° to +90°
1P3W
V Io
3P4W
V Io
L1:
0° to ±90°
L2:
180° to ±90°
3P3W
V Io
+60° to +180°
L1:
0° to ±120°
L2:
0° to 180° to -120°
L3:
+120° to 180° to 0°
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7.1Measured values KEW5050
“Switching the displayed systems”
Press to toggle the screens to view the measurements on each system.
”Showing measured values on each system”
Press to show the measured values.
Displaying measured values of entire system
Measured values of entire system are summed and displayed on one screen. This screen doesn’t appear when the system to be measured is just one; only one screen (LOAD 1) is available. The number following alphabets indicates the system numb er; the symb ol wit hout numb er indic ates the d ispl ayed value i s the sum of all systems.
List display
Example: 3P3W (Three-phase 3-wire, 4-system)
* On a wiring system of 3P3W, Ior is bigger than Io if Io flows in the phase between R and T phase voltages.
Trms leakage current with resistive components only
Frequency of reference voltage
Io
Iom
R
V
* The number following alphabets indicates the system number.
Symbols displayed on the LCD
Trms leakage current with basic wave of
50/ 60Hz only
Trms leakage current including harmonic
components Insulation resistance is determined by
V: Reference voltage (Trms, basic wave)/ Ior: Leakage current (Trms, resistive components)
Ior
Note: Displayed value is just for reference since the measurement method differs from insulation
resistance testers and may not be consistent with each other.
Trms reference vo ltage w ith ba sic wave of 50/ 60Hz only
f
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KEW5050 7.1Measured values
“Switching the displayed systems”
Press
to toggle the screen to view the measurements on each system.
“Showing the results by item”
Use to switch the items to be displayed. “Whole system” : Total values displayed by item.
“Leakage current” : List of Io values measured on all systems. “Resistive leakage current” : List of Ior values measured on all systems.
rms
“Leakage current “Insulation resistance ” : List of R values measured on all systems.
: List of Iom values measured on all systems.
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7.2 Event KEW5050

Event
Press to view the information on the recorded events.
Another press of returns to the previous screen.
Displaying information on occurred event
Type of events
Event occurred CH (system)
Date of occurrence
Event type (+ icon)
Ch (system) no.
CH (system) Number of occurrence per CH (system)
Date of occurrence/ Measured value
Scroll bar
Time of occurrence Hour: min.: second. ms
Values measured when the event occurred.
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KEW5050 7.2 Event
Symbols displayed on the LCD
Trms leakage current
Upper
TH (H):
Event symbol
Lower
TH (L):
Peak
TH (Pk):
OCRD (Number of
occurrence)
Ch (system) no. Ch (system 1 – 4) on which events are detected.
Dat e of occurrence Date when the start/ end of event isdetected.
Time of
occurrence
Measured value
Indicates how many times the event occu rred. When an even t occu rred, the number increases by 1, and increase one more a t the e nd of even t; that is, in creases by 2 in total.
Time when the star t/ end of ev ent is de te cted. Instantaneous values when the start/ end of event is detected. Measured values of a long-
lasting event can be checked with the interval measurement data. Setting a short interval (200ms is the shortest interval) at event recording is recommended for better analysis.
Reference Trms voltage
Leakage current
Resistive leakage current
Reference voltage
Trms reference voltage
Reference voltage
Trms leakage current
Trms reference voltage
Start End
H:Iom H:Iom H:Vm H:Vm H:Io H:Io H:Ior H:Ior H:V H:V L:Vm L:Vm L:V L:V Pk: Iom Pk:Iom Pk:Vm Pk:Vm
Adjusting display area
Press to scroll the screen vertically and adjust the display area.
Event extraction
Selected item
Selected item
[
(blink)
Confirmed Cancel
]
OCRD
ALL
H:Iom
H:Vm
H:Io
H:Ior
H:V
L:Vm
L:V
Pk:Iom
Pk:Vm
Press
◀ ▶ ▶ ▶ ▶ ▶ ▶ ▶
▶ ▶
to toggle the items* enclosed with “
* Event didn’t occur will be skipped and not be displayed.
CH
EVT.
ALL
◀ ◀ ◀ ◀ ◀ ◀
V
A A1 A2 A3 A4
▶ ▶ ▶ ▶ ▶ ▶
◀ ◀
◀▶
Meas.
Occurred
” Confirm
▶ ▶
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7.2 Event KEW5050
Measurement method of biggest/ smallest events
Each event is detected based on Trms values measured in approx. 200ms, gapless. When an event is detected, the beginning of the 200ms period where the event detected is regarded as the start time of the event. If further event is not detected in the following 20 0ms periods; the begi nning of the wavefo rm is regarded as th e end of the event. The detected event is assumed to be continued between the start to the end of event detection.
Example of event detection (biggest event)
Trms values in continuous 200ms (50/60Hz: 10/ 12-cycle) periods
Current/ voltage
waveform
Threshold value
waveform
Trms
Trms
Trms
~~~
Start
Trms
Hysteresis
End
Duration
Example of event detection (smallest event)
*
Trms values in continuous 200ms (50/60Hz: 10/ 12-cycle) periods
Voltage
waveform
Threshold value
Trms
waveform
Trms Trms
~~~
Start
Trms
Hysteresis
End
Duration
Trms (n)
・・・n
Trms (n)
・・・n
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KEW5050 7.2 Event
Detection of Peak event
Peak values are checked every 200ms, while monitoring waveforms of Trms leakage current and reference voltage at approx. 40ksps, gapless. The beginning of the 200ms period where the first peak event is detected is regarded as the start of the event. If further peak events are not detected in the following 200ms periods; the beginning of the waveform is regarded as the end of the event. The detected event is assumed to be continued between the start to the end of event detection .
Example of peak event detection
Measured waveform
Start
Approx. 200ms
Duration
Threshold value
End
Saved data
When an event occurs, type of the occurred event, ch(system), start/ end time and measured values are recorded.
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8.Other functions KEW5050

8. Other functions

Data hold
Display is held anytime by pressing . The LCD shows to indicate the data hold function is enabled. Another press of releases the held indicati on and disa ppears. The screens can be switched to check each measured value while the display is being held, and measur ed values and event information are continuously recorded.
Key lock
Press 2 sec. or longer. The LCD shows and all keys are disabled. Another press of 2 sec. or longer releases the locked keys and disappears.
Note
The button doesn’t work while the key lock function is enabled. T o pow er off the Product, press 2 sec. or longer and turn off .
Backlight Auto-off
While operating with AC power source:
The LCD backlight is turned off automatica lly 5 min after the last k ey operation. Press any k ey except for Power key to turn on the light again. To disable the Backlight auto-off function, press and go t o “Others”, “KEW5050 setting”, “Backlight” and select “Disable”.
While operating with battery:
The backlight is automatically turned off 2 min after the last key operation. Press any key except for the Power Key to turn on the backlight aga in. The backlight doesn’t stay on while the Product is operating with batteries.
Auto-power-off
While operating with AC power source:
The LCD backlight is turned off automatica lly 5 min after the last k ey operation. Press any k ey except for Power key to turn on the light again. To disable the Backlight auto-off function, press and go t o “Others”, “KEW5050 setting”, “Power” and select “Disable”.
While operating with battery:
The backlight is automatically turned off 2 min after the last key operation. Press any key except for the Power key to turn on the backlight again. The backlight do esn’t stay on while the Pro duct is oper ating with batteries.
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KEW5050 8. Other functions
Auto-ranging
Current range of each sensor is switched automatically according to the measured Trms currents. This auto­ranging function doesn’t work at event recoding. A range shifts to one upper range when the input exceeds 300%peak of each range and shifts to one lower range when the input drops under 100% Trms of each range.
Sensor detection
Press to go to “Basic” tab, and move the highlight to “Detect” under [Clamp] to detect the connected clamp sensors automatically. The Product automatically detects the connected sensors when it gets started
and notifies only when the con nected sen sors are different from the ones used in the previous test.
Print screen
Press
to save the currently displayed screen as a BMP (bitmap) file. * File size: approx. 77KB
Retaining settings
All the settings have been saved and ke pt in the Product and not be cleared on t he time of power-off. The product adopts the same settings used at the previous test when powering on again. * Default values will be displayed for the first time after purchase.
Status indicator
The green LED blinks while the Product is in stand-by mode and stays on during recording.
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9.1 Data transfer to PC KEW5050

9. Device connection

Data transfer to PC
Data in the SD card can be transferred t o PC via USB or SD card reader. (supporting USB mass storage) KEW5050 is connected as a removable disk.
Notes:
The PC doesn’t recognize the SD card in the Product during a recording to prevent the measurement data.
The Product isn’t compatible with all kinds of dev ic es. The Product m a y not wor k pr op er ly if it is c on necte d
to a PC via a USB hub.
Installing the supplied USB driver i s esse ntia l even when u sing USB ma ss storage mode .
* It is recommended to use SD card to transfer data to PC. (Transfer time: approx. 320MB/ hour) It takes longer time to transfer large data by use of SD card since transferring large data files by USB requires more time than using the SD card reader. As to the manipulation of SD cards, please refer to the instruction manual attached to the card. Ensure that the SD card contains only the data files meas ured with the Product to save data properly.
USB connection
SD card
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KEW5050 9.2 Signal control

Signal control
Connection to output terminal
DANGER
The digital output terminal L is earthed via earth cable where the Product is earthed with the eart h cable; therefore, voltage applied to the digital output terminal L should be equal to earth voltage. It may damage the Product or cause serious electrical accident. Max rated voltage to ground for digital output terminal H is 30 V, 50 mA, 200 mW or less.
Connectable wire size Suitable wire : single-wire Φ1.2 (AWG16), twisted wire 1.25mm2 (AWG16), strand size Φ0.18mm or more Usable wire : single-wire Φ0.4 - 1.2 (AWG26 - 16), twisted wire 0.2 - 1.25mm strand size Φ 0.18mm or more Standard length of bare wire: 11 mm
1 Open the Connector cover. 2 Press the rectangular protrusion above a terminal with a flat-blade screw driver, and insert a signal wire. 3 Remove the driver and fix the wire.
2
(AWG24 - 16),
Digital output terminal
Output format : Open collector output H terminal: Internal pull-up resistor of 10 k, 5 V Allowable input is up to 30 V, 50 mA, 200 mW. L terminal: Earthed via ea rth cable .
Signal wire
Flat-blade screwdriver
Digital output terminal
+5V
H
OUTPUT
L
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The circuit of H and L terminal is open collector output t ype as illustrated to the left. The L terminal is earthed via the earth cable; the H terminal has a pull-up resistor of 10 k to control voltage to 5 V for a conne ctio n w ith ex tern al de vice . The output of H terminal is usually 5 V. The H terminal is connected to L terminal while events are lasting; that is, voltage across the terminals is 0 V. If the duration of an event is less than 1 sec., voltage across the te rminals will be 0 for 1 sec. The same situation occurs when mul tiple events occur and overlap at the same time. To limit the target events, please refer to: 6.3 Eve nt setting (P.
45) and set “OFF” to the unnecessary events.
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9.3 Getting power from measured line KEW5050

Getting power from measured line
When it is difficult to use an AC adapter to get power from an outle t, use MODEL8329 (power ad apter) instead to derive power through voltage test leads.
DANGER
The power adapter, test lead and the Product belong to different measurement categories respectively. The power adapter is rated to the lowest category; do not connect to a circuit on which earth voltage exceeding 150 V AC in CAT III or 240 V in CAT II exists.
MODEL 8329 Power adapter is rated to 50 Hz/ 60 Hz.
Connect voltage test lead to the Product first, and only then connect i t to th e measu rement lin e .
Never disconnect the voltage test lead from the connector of the Product during a measurement (while the
Product is energized).
Connect to the downstream si de of a circui t breaker si nce a current capacity at the upstream side is large.
WARNING
Never attempt to make measurement if any abnormal cond itions are noted, such as a broken cover and exposed metal parts.
Power off the Product before connecting the adapter and test leads.
Firmly connect voltage test leads to the Product first.
Follow the procedures below to connect the adapter.
1 Ensure that KEW5050 and MODEL8329 are both powered off. 2 Connect voltage test leads to power input terminals (N/ L) on MODEL8329,
and then the plugs of MODEL8329 to the reference voltage input terminals on
KEW5050. 3 Firmly connect the power plug of MODEL8329 to AC adapter. 4 Connect the output terminal of AC adapter to the female connector of earth cable. 5 Firmly connect the connection terminal of the earth cable to the AC adapter
connector on the Product. 6 Connect the clip of earth cable to
DANGER
other than earth terminal. Never connect to a live wire.
7 Connect the alligator clip of voltage test lead to the
circuit under test. 8 Power on KEW5050. 9 Power on MODEL8329.
Reversed procedure is appli ed to remove the Adap ter from the Product. Read through MODEL8329 instruction manual as well.
well-known earth terminal
Always check so as not to connecting the clip
:
7
240 V or less
.
4
2
1 / 9
2
MODEL8329
Measurement category: CAT III 150 V CAT II 240 V (50/ 60 Hz) Fuse rating: 500 mA / 600 V AC, Fast acting type Ø 6.3 × 32 mm
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6
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5
KEW5050 10.PC software for setting and data analysis

10. PC software for setting and data analysis

The special software “KEW Windows fo r KEW5050” al low s da ta analy sis* and the setup o f KEW5050 on a PC . * Automati c gene ration o f graphs and lists ba sed on the reco rded data by just one click. Da ta managemen t of
different settings for multiple KEW5050 units and recorded data.
Please refer to the installation manual for “KEW Windows for KEW5050” and install the application and USB driver in your PC.
Interface Communication method: USB Ver2.0 USB communication using a special software “KEW Windows for KEW5050” allows:
* Downloading files downloading files in the SD card to a PC, * Making settings for the Product via a PC, * Displaying the measured results on a PC in graphic form
System Requirements OS(Operation System) For the supported OS, please check the version label on the CD case or visit our website. Display 1024 × 768 dots, 65536 colors or more HDD (Hard-disk space required) 1Gbyte or more (including Framework)
.NET Framework 3.5 .NET Framework 4.6
Trademark
Windows® is a registered trademark of Microso ft in the Uni t ed Sta tes.
The latest software is available for download from our homepage.
http://www.kew-ltd.co.jp
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11.1 Safety requirements KEW5050

11. Specifications

Safety requirements
Location for use : In door use, Altitude up to 2000m Temp. & Hum. range : 23°C±5°C, Relative humidity 85% or less (no condensation) (guaranteed accuracy) Operating Temp. & Hum. range : -10ºC to 50 ºC, Relative humidity 85% or less (no condensation) Storage Temp. & Hum. range : -20ºC to 60ºC, Relative humidity 85% or less (no condensation) Withstand voltage :
5160 V AC/ 5 sec. Between Reference voltage input terminal and Enclosure 3310 V AC/ 5 sec. Between Referen ce voltage input termi nal and Current input terminal , Connector for AC adapter, Communication (USB) connector.
Insulation resistance : 50 M or more/ 1000 V , between Voltage/ Current input terminal, Connector for AC adapter and Enclosure Applicable standards : IEC 61010-1, -2-030
Measurement category
Main unit: CAT IV 300 V CAT III 600 V , Pollution degree 2
Voltage test leads: CAT IV 600 V CAT III 1 kV, Pollution degree 2 IEC 61010-031, IEC61326 Class A Dust/ water-proof : IEC 60529 IP40

General specification

LCD : 160 × 160 dots, FSTN monochrome display Display update : 500 ms*
*
There is time lag in display update (400 ms max) due to arithmetic processing; however, no time lag between the recorded data and the time stamp.
Backlight OFF: Automatically turns off in 2 min (when working with battery)/ in 5 min (working w ith
ON: Turn on by pressing any key other than power key. Dimension : 165(L) × 115(W) × 57(D) mm Weight : approx. 680g (including batteries) Accuracy : within ±5 sec/ day Power source : MODEL8262 AC ad apte r
Voltage range 100 V AC – 240 V AC Frequency 50 Hz/ 60 Hz (Allowable range: 47 Hz – 63 H z) Power consumption 7.5 VA max
: DC power source
Dry cell battery Rechargeable battery Voltage
Battery Size AA Alkaline (LR6) Size AA Ni-MH (1900mA/h) Current consumption 0.21 A typ.(@4.5 V) 0.26 A typ.(@3.6 V) Battery life
*ref. value at 23ºC
AC power) after the last key operation.
4.5 V DC
11 hours 9 hours * with fully charged batteries
(1.5V×3 in series × 2 in parallel)
3.6 V DC
(1.2V×3 in series × 2 in parall el)
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KEW5050 11.2General specification
Accessories : MODEL7273 voltage test lead (CAT III 1 kV, CAT IV600 V, with red&black alligator clip) 1 set
Cable marker - 4 colors x 2 pcs each (re d , yell ow, blue, green) ···························· 8 pcs MODEL8262 AC adapter ············································································ 1 pce MODEL7170 Power co rd ············································································ 1 pce MODEL7278 Earth cable ············································································ 1 pce MODEL7219 USB cab le ············································································· 1 pce Instruction manual ····················································································· 1 pce Installation manual ····················································································· 1 pce CD-ROM ································································································· 1 pce
KEW Windows for KEW5050 (Data analysis & configuration software)
Instruction manual (PDF file) Alkaline size AA battery (LR 6) ······································································ 6 pcs SD card (2GB) ·························································································· 1 pce MODEL9125 Carrying bag ·········································································· 1 pce
Optional accessories: Clamp sensor MODEL81 77 (
MODEL8178 ( MODEL8146 ( MODEL8147 ( MODEL8148 ( MODEL8141 ( MODEL8142 ( MODEL8143 ( MODEL8128 ( MODEL8127 ( MODEL8121 ( MODEL8126 ( MODEL8125 ( MODEL8122 ( MODEL8123 ( MODEL8124 ( MODEL8130 ( MODEL8129 (
Ior leakage clamp sensor 10 A type Ø40mm) Ior leakage clamp sensor 10 A type Ø68mm)
Leakage clamp sensor 10 A type Ø24mm) Leakage clamp sensor 10 A type Ø40mm) Leakage clamp sensor 10 A type Ø68mm) Leakage clamp sensor 1 A type Ø24mm) Leakage clamp sensor 1 A type Ø40mm) Leakage clamp sensor 1 A type Ø68mm)
Clamp sensor 50 A type Ø24mm) Clamp sensor 100 A type Ø24mm) Clamp sensor 100 A type Ø24mm) Clamp sensor 200 A type Ø40mm) Clamp sensor 500 A type Ø40mm) Clamp sensor 500 A type Ø40mm) Clamp sensor 1000 A type Ø55mm)
Clamp sensor 1000 A type Ø68mm) Flexible sensor 1000 A type Ø110mm) Flexible sensor 3000 A type Ø150mm)
MODEL8329 Power adapter (CAT III 150 V, CAT II 240 V)
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11.3 Measurement specification KEW5050

Real-time OS:
This Product uses the source code of T-Kernel under T-License granted by the T-Engine Forum (www.t-engine.org) Portions of this software are copyright © 2010 The FreeType Project (www.freetype.org). All rights reserved.
External communication: via USB * USB cable length should be 2m or less.
Connector mini-B Communication method USB Ver2.0 USB identification no. Vendor ID: 12EC (Hex), Product ID: 5050 (Hex), Serial no.: 0 +7-digit individual no.
Communication speed 12Mbps (full-speed) Digital output terminal: The circuit of H and L terminal is open collector output type. The L terminal is earthed via the earth cable; the H terminal has a pull-up resistor of 10 k to control voltage to 5 V f or a conn ection with extern al device. The H terminal is connected to L terminal while events are lasting; t hat is, voltage across terminals i s 0 V. If the duration of an event is less than 1 sec., voltage across terminal s will be 0 for 1 sec. The same situa tion occur s when multiple events occur and overlap at the same time.
Connector Through hole Screwless terminal block, 2-pole (ML800-S1H-2P) Output format Open collector output, 0 V between terminal H and L, acti ve Input voltage 0 – 30 V, 50 mA max, 200 mWmax
Voltage across terminals
Rated input
H terminal
L terminal
While detecting events: 0 V – 1 V Stand-by mode: 4 V – 5 V (inside pull-up resistor 10 k, 5 V) Max. voltage-to-ground: 30 V, 50 mA, 200 mW * Earthed via earth cable.
Measurement specification
Frequency f 〔Hz〕
Measurement method : Reciprocal method; calculating reciprocal numbers of accumulated counts in 10­ cycle (50 Hz)/ 12-cycle (12-cycle).
Displayed digit 3-digit Accuracy ±2dgt *where reference voltage is sine wave 40 - 70Hz and 10 V Trms or higher. Display area 10.0 - 99.9 Hz (Bar (“----“) indication outside of this range) Signal source Reference voltage
Measurement item and the number of analysis points
Computed with 8192-point data while regarding 200ms(50Hz:10-cycle, 60Hz:12-cycle) as one measurement area. Trms leakage current (Iom), T rms reference voltage (Vm)
Computed with 4096-point data while regarding 200ms(50Hz:10-cycle, 60Hz:12-cycle) as one measurement area. Leakage current (Io), Reference voltage (V), Resistive leakage current (Ior), Phase angle (θ), Insulation resistance (R)
Measured in 40.96ksps
Instantaneous peak leakage current (IomP), Instantaneous peak reference voltage (VmP)
83 KEW5050
(every 24.4μs).
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KEW5050 11.3Measurement specification
r
t
Instantaneous events to be measured
Measurement method :40.96ksps (every 24.4μs), gapless, calculate Trms values every 200ms. Effective frequency range : 40 – 70 Hz
Trms leakage current (Leakage clamp sensor) Trms load current (Load current clamp sensor) Iom [A T rms]
Range
Display digit Leakage clamp sensor : 5-digit
Effective input range 1% - 110% (Trms) of each range, and 200% (peak) of the range Display range 0.15% - 130% (display “0” for less than 0.15%, “OL” if the range is exceeded) Crest factor 3 or less Accuracy ±0.2%rdg±0.2%f.s. + clamp sensor amplitude accuracy
Input impedance Approx. 1 M Equation
*
1
Leakage clamp sensor 8177/8178 (10A type) : 10.000/100.00/1000.0m/10.000A/AUTO 8146/8147/8148 (10A type) : 10.000/100.00/1000.0m/10.000A/AUTO 8141/8142/8143 (1A type) : 5.000/50.00/500.0m/1.000A/AUTO Load current clamp sensor 8128 (50A type) : 500.0m/5.000A/50.00A/AUTO 8121/8127 (100A type) : 1000m/10.00/100.0A/AUTO 8126 (200A type) : 2.000/20.00/200.0A/AUTO 8122/8125 (500A type) : 5.000/50.00/500.0A/AUTO 8123/8124/8130 (1000A type) : 10.00/100.0/1000A/AUTO 8129 (3000A type) : 300.0/1000/3000A
Load current clamp senso
* for waveforms of sine wave 40 – 70 Hz
−=1
Iom
n
1
=
⎜ ⎝
n
()
0
i
2
iIo
:4-digi
Trms reference voltage Vm [V Trms]
Range 1000.0V Display digit Effective input range Display range Crest factor
Accuracy ±0.2%rdg±0.2%f.s. * for waveforms of sine w ave 40 – 70 Hz Input impedance Approx. 4 M
*
Equation
*
1
V: Reference voltage, Io: Leakage current, i: Sampling point no., n: Approx. 8192 points
KEW5050 84
1
5-digit 10 – 1000 V Trms, and 200 0 Vp eak
0.9 V - 1100.0 V Trms (display “0” for less than 0.9 V, “OL” if the range is exceeded) 2 or less
−=1
Vm
n
1
=
n
⎜ ⎝
i
0
()
2
iV
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11.3 Measurement specification KEW5050
t
θθθ
Items to be calculated
Measurement system : Digital PLL synchronization Measurement method : Calculation with a basic wave after harmonics analysis Effective frequency range : 40 - 70Hz Window width : 10-cycle at 50Hz, 12-cycle at 60Hz Window type : Rectangular Data analysis : 4096 points Analyzing rate : Once/ 200ms at 50Hz/60Hz, gapless
TRMS Leakage current, basic wave (Leakage clamp sensor) TRMS Load current, basic wave (Load current clamp sensor) Io [Trms]
Range The same as Trms leakage/ load current Display digit The same as Trms leakage/ load current
Effective input range Display range The same as Trms leakage/ load current
Meas. method Analysis window width is 10/12-cycle against 50/60Hz, measurement values are
Accuracy
*
Equation
2, 3
The same as Trms leakage/ load current
calculated by basic wave only. ±0.2%rdg±0.2%f.s.+ clamp sensor amplitude accuracy * for reference voltages with sine wave 40 – 70 Hz and 90 V Trms or higher
()
()
()
22
()
1010 ikrkc IoIoIo +=
Reference voltage V [T rms]
Range The same as Trms reference voltage Display digit The same as Trms reference voltage Effective input range The same as Trms reference voltage
Display range The same as Trms reference voltage
Meas. method
Accuracy
*
Equation
Phase difference of reference voltage, current θdeg
Display digit 4-digi Display range 0.0° to ±180.0° (regarding the phase of reference voltage as 0.0°)
Meas. method Analysis window width is 10/12-cycle against 50/60Hz, measurement values are Accuracy Within ±0.5° for the inputs of 10% or higher of leakage current range, sine wave 40 -
Equation
2, 3
*
3
Analysis window width is 10/12-cycle against 50/60Hz, measurement values are calculated by basic wave only. The same as Trms reference voltage
()
()
Leading: 0 to +180°, lagging: 0 to -180° calculated by basic wave only. 70 Hz, reference voltage of 90 V Trms or higher ,
Within ±1.0° when using Ior leakage clamp sensor, and Within ±0.5°+ clamp sensor accura cy w hen using gene ra l purpo se cl a mp se nsor.
VIo
=
()
V
θ
22
()
1010 ikrk VVV +=
=
tan
V
1
r
θ
Io
V
i
=
tan
1
⎨ ⎩
Io
r
Io
i
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KEW5050 11.3Measurement specification
V
V
Resistive leakage current Ior [A Trms]
Range The same as Trms leakage/ load current Display digit The same as Trms leakage/ load current Effective input range The same as T rms leakage/ load current
Display range
Meas. method Analysis window width is 1 0/12-cycle against 50/60Hz, measurement values are
Accuracy
Note:
Accuracy isn’t specified for general purpose leakage clamp sensor.
Equation 1P2W 1P3W
*
2, 3
The same as Trms leakage/ load current * not displayed when using load current cla mp se nsor s.
calculated by basic wave only. For reference voltages of sine wave 40 – 70 Hz and 90 V Trms or higher , ±0.2%rdg±0.2%f.s. + clamp sensor amplitude accuracy + error of phase accuracy* (phase error) * add ±2.0%rdg to measured Io va lue when u sing Io r leakag e cl a mp se nsor.
(θ: within the accuracy of reference voltage/ current phase difference ±1.0°)
Calculation example: When using KEW8178 and measuring Ior = 1mA, Io=5mA on 10mA range; ±0.2%rdg±0.2%f.s.±.0%rdg (amplitude accuracy of KEW8178)
+Io×±2.0%rdg (clamp sensor phase error: ±1.0°) = 1mA (Ior)×±0.2%+10mA (Ior_f.s.)×±0.2%+1mA (Ior)×±1.0%+5mA (Io)×±2.0% = ±0.002mA±0.02mA±0.01mA±0.1mA = ±0.132mA ±0.132mA/ 1mA( Ior) ±0.132; therefore, Ior accuracy against 1 mA is ±13.2%rdg.
××
IoVIoV
ikikrkrk 10101010
Ior
() () () ()
+
=
3P3W
Ior
32
() () () ()
×=
IoVIoV
××
rkikikrk 10101010
3
3P4W Sum of balanced static capacitive leakage current (Ioc) is zero.
LIocLIocLIocIoc
=++= 03_2_1_
IoIor
=
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11.3 Measurement specification KEW5050
Ior
Insulation resistance R [ohm]
Range Display digit
Display range
*
Equation
*
2
V: Reference voltage, Io: Leakage current
*
3
k=1: 1st order of harmonic wave (basic wave) r: real numb er componen t afte r FFT,
2
i: imaginary number component after FFT Measurement cycle in the equation is 10-cycle; replace “10k” with “12k” if a measurement cycle is 12.
20.00M 4-digit * not displayed when using load current clamp sensors.
0.15% - 130% of the range (“0” is displayed if less than 0.15%, “OL” if the range is exceeded.) Bar (“----“) is displayed where reference voltage/ leakage current is “0” or “OL”.
V
R =
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KEW5050 11.3Measurement specification
Event items
Upper limit of T rms values H: Iom / H: Io / H: Ior[A Trms] / H: Vm / H: V[V Trms] Lower limit of T rms values L: VmL/ L: V[V Trms]
Meas. method Range Display digit Effective input range Display range Crest factor Accuracy Input impedance
Instantaneous peak leakage current Pk:Iom[A peak]
Meas. method Check and detect event occurrence in approx. 40.96ksps (every 24.4μs), gapless Range The same as Trms leakage/ load current Display digit The same as Trms leakage/ load current Effective input range 0.15% of each range (1mA<) - 200% (peak) Display range 0.15% of each range (1mA<) - 200% (peak)
Accuracy
Input impedance Approx. 1 M
Threshold value Specify the peak current in absolute value.
The same as each measurement item The same as each measurement item The same as each measurement item The same as each measurement item The same as each measurement item The same as each measurement item The same as each measurement item The same as each measurement item
Based on 100% (DC) of each range. x 1/ 10/ 100 ranges : ±0.5%f.s. + clamp sensor amplitude accuracy x 1000 range : ±5.0%f.s. + clamp sensor amplitude accuracy * In case of Ior leakage clamp sensor, x 1: 10A / x 10: 1000mA/ x 100: 100mA/ x 1000: 10mA
Instantaneous peak reference voltage Pk:VmV peak
Meas. method Check and detect event occurrence in approx. 40.96ksps (every 24.4μs), gapless Range The same as Trms reference voltage Display digit The same as Trms reference voltage Effective input range 50 V – 2000 V (peak) Display range 50 V – 2000 V (peak) Accuracy ±0.5%f.s. *based on 1000V DC Input impedance Approx. 4 M Threshold value Specify the peak voltage in absolute value.
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12.1 General troubleshooting KEW5050

12. Troubleshooting

General troubleshooting
When any defect or failure of the Produ ct is suspected, check the follo wing points first. If your problem is not listed in this section, contact your local Kyoritsu distributor.
Symptom Chec k
Cannot power on the Product. (Nothing is displayed on the LCD.)
Cannot power off the Product. ● Key lock function is turned off?
Any key doesn’t work. Key lock function is turned off?
The LCD doesn’t indicate “0” at the time of no load.
When operating with an AC power supply:
Power cord is firmly connected to an outlet?
Output terminal of AC adapter and earth cable is properly connected
to the Product?
No break in Power cord, AC adapter output cable or earth cable?
Supply voltage is within the allowable range?
When operating with batteries:
Batteries are installed with observing correct polarity?
Fully-charged size AA Ni-HM batteries are installed?, or
Size AA Alkaline batteries are not exhausted?
If the problem not solved yet:
Disconnect the AC adapter and remove all batteries from the Product. Insert the batteries again and connect the AC adapter, and power on the Product. If the Product still does not turn on, failure of the Product itself may be suspected.
When the display update doesn’t work, disconnect the AC adapter and remove all batteries. Connect the ad apter and insta ll ba tteri es again, and power on the Product. If the Product still doesn’t work properly, failure of the Product itself may be su spected .
Check the effective keys on each range.
Some digits may be displayed while;
- reference input voltage terminals are open,
- no sensors are connected to current input terminals, or
- clamp sensors are connected to the Product, but not clamping onto a measured conductor.
In any of above cases, there’s no influence on measurements.
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KEW5050 12.1 General troubleshooting
Symptom Che ck
LCD doesn’t show the measured values. Readings are unstable or inaccurate.
Cannot save data on the SD card, or read the saved data in the card.
Cannot download data or make settings via USB communication.
SD card is not detected by PC. (USB connection)
Voltage test leads are connected properly? Connecting the voltage test leads are required, even when measuring current on ly, to get stable readings.
The orientation of clamp sensor is correct?
The Product needs to be earthed w hen usin g AC adapte r. Prop erly
earth the Product with the supplied earth cable.
Frequency of the reference voltage is within the allowable range: 40 – 70 Hz?
Setting of the Product and the selected wiring configuration are appropriate for the measured line?
The sensor setting is harmonized with the sensor in use? Manual configuration is required for general purpose clamp sensor.
No break in voltage test leads or failure of clamp sensor?
Noise interference on input signal?
Strong electric magnetic field does no t exist i n proxim ity?
Measurement environment meets the specification of the Product?
SD card is insert ed co rre ctly ?
SD card supplied with the Produ ct or suppl ied as option al pa rts is
used? Proper operation is not guaranteed if any other card is used.
SD card has been formatted on the Produ ct? Formatting on any other
devices may reduce spac e or ma ke the da ta un rea dable .
Is there available free space in a SD card?
Verify the proper operation of SD card on other well-known hardware.
PC and the Product is properly connected with the supplied USB
cable?
Run the communication application software “KEW Windows for KEW5050” and check the connected devices are displayed or not. If no device is displayed, USB driver mi ght no t be in stall ed co rrec tly. Please refer to the installation manual for “KEW Window s fo r KEW5050” and re-install the USB driver.
The SD card in the Produ ct isn’t detected by the PC during a re cording in order to protect the measured data.
USB driver might not be installed correc tly. Please refer to the installation manual for “KEW Windows for KEW5050” and re-install the USB driver.
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12.2 Input and display items KEW5050

Input and display items
Input and display items vary depe nding on th e setti ng.
Check
Cannot enter/ delete serial no. These functions are available with general leakage clamp sensor
only . Refer to “Serial No.” (P. 44) in this manual.
Cannot set event detection to “ON”.
Current range for clamp sensor is set to other than “AUTO”? When “AUTO” is set, event detection is automatically set to off on the
CH. Select a fixed range, event th reshold is included, to en able event detection and set “ON” to event detection. For further detail, see “Upper threshold value (H)/ ch” (P. 46) and “Peak threshold value (Pk)/ch” (P . 50) for detail.

Error messages and actions

Error message may appear on the LCD while using the Product. Please check the following table, if any error message appears, and take actions.
Message Detail & Action
Cannot start recording. Please check the SD card.
Cannot save data. Check the SD card.
No SD cards.
Out of SD card space. Recording will be stopped.
Not having free space on the SD card. Format the card or delete unnecessary files.
Confirm that the SD card is inserted correctly.
If any problem on the SD card is suspected, please refer to:
“12.1 General troubleshooting” (P. 89) – “Cannot save data
on the SD card, or read the saved data in the card.”
Backup the files to a PC and delete them or format the card, or use another SD card formatted on the Product only after
stop recording and confirm the message “Recording stopped.” disappears. See”Recorded data” (P.57) for detail.
Check the free space on the SD card. If the space is not enough, backup and delete the files or format the card, or use another card. The SD card should be formatted on KEW5050,
See “
not on the PC.
Saved data
” (
P.57
).
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KEW5050 12.3 Error messages and actions
Message Detail & Action
Connected sensor doesn't match the settings on the unit. Check the connection.
The connected sensor differs from previous one. Check settings.
Sensor connection is incorrect. Check the connection.
Start time is set in the past. Check the recording start method.
Cannot change instrument settings during recording or in stand-by mode. Event detection is disabled on AUTO range.
The connected clamp sensor(s) differs from the one(s) used during the previous test.
KEW5050 automatically identify Ior clamp sensor only. Manual setting is required to use general purpose leakage clamp
sensor. Make settings from: , “Basic tab”, [Clamp].
Confirm that current clamp sensor(s) is(are ) firmly connected to.
If any failure is in doubt:
Disconnect the sensor , fo r which "N G" i s given and connect to the CH on which another sensor is properly detected. If the result "NG" is given for the same CH , a de fect of the Produ ct is suspected. A defect of sensor itself is suspec ted i f "NG" is give n for the same sensor. Stop using the Product and the sensor, if any defects are in doubt.
REC Start is set to either “Constant.” or “Time period.” and the time set for “REC End” is set to the past. Check and modify the time and date. See “Recording setting” (P.53).
Setting change is no t all ow ed du ri ng a re cord ing . To ch ange
the settings, stop recording and confirm “Recording stopped.” message appears and then disappears.
When “AUTO” is set to A range for clamp sensor, event detection on the subjected CH is automatically set to “OFF”. Select a fixed range, event threshold value is included, to enable event detection function.
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