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Kyoritsu Electrical Instruments Works KEW3431, Instruction Manual

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Kyoritsu Electrical Instruments Works KEW3431 Instruction Manual Download Page 23

̶ 21 ̶

8-4 LED insulation status indicator

KEW3431  has  insulation  status  check  function.  In  an  insulation 
measure-ment,  the  measured  value  is  compared  to  the  pre-set 
reference value, and either red or green LED lights up according to 
the result. This function can be turned off. See 10. How to disable 
LED  insulation  status  indicator  &  auto-lighting in  this  manual  for 
detail.

Reference values for each range

Nominal voltage

250V

500V

1000V

Reference value

0.25M

0.5M

1M

Reference  values  are  determined  based  on  the  resistance  value  to 
provide  1mA  with  the  nominal  voltage.  The  color  of  LED  indicates 
the result as follows.

Compared result

LED insulation status 

indicator

> reference value

Solid green

< reference value

Solid red

 

LED insulation status indicator

Fig. 8-7

Summary of Contents for KEW3431

Page 1: ...Instruction Manual Compact Insulation resistance tester KEW3431 ...

Page 2: ...oltage measurement 14 7 1 Measurement method 14 8 Insulation resistance measurement 15 8 1 Measurement method 18 8 2 Continuous measurement 19 8 3 Output voltage characteristics 20 8 4 LED insulation status indicator 21 9 Scale light and LED light 22 10 How to disable LED insulation status indicator auto lighting 23 11 Battery replacement 25 12 Shoulder strap belt attachment 26 13 Storing in Carry...

Page 3: ...be used only in its intended applications Understand and follow all the safety instructions contained in the manual It is essential that the above instructions are adhered to Failure to follow the above instructions may cause injury instrument damage and or damage to equipment under test Kyoritsu is by no means liable for any damage resulting from the instrument in contradiction to these cautionar...

Page 4: ...y functions equipped with the instrument do not work and instrument damage or serious personal injury may be caused Verify proper operation on a known source before use or take action as a result of the indication of the instrument WARNING Never attempt to make any measurements if any abnormal conditions such as a broken cover or exposed metal parts are present on the instrument and test leads Ens...

Page 5: ...Do not let the instrument get wet with water otherwise it may cause malfunction If the instrument is wet make sure to let it dry before putting it into storage Keep your hand and fingers behind the barrier during a measurement Symbols The following symbols are used and marked on the instrument and in the instruction manual Please carefully check before starting to use the instrument CATⅢ Primary e...

Page 6: ...eater momentary energy than one designed for CAT II O Circuits which are not directly connected to the mains power supply 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 ...

Page 7: ...ontrol switch is supplied as standard accessory Shoulder strap for both hands operation User changeable test prods Live circuit warning with blinking LED and buzzer Voltage measurement AC DC auto detection Live circuit warning for a voltage input of 30V or higher Insulation resistance measurement With auto discharge function When an insulation resistance like a capacitive load is measured electric...

Page 8: ...esn t light up if input voltage is less than 30V Insulation resistance measurement Rated measurement voltage 250V 500V 1000V Max effective scale value 200MΩ 200MΩ 2000MΩ Accuracy in first effective measuring ranges 0 1 to 100MΩ 1 to 1000MΩ within 5 of indicated value Accuracy in second effective measuring ranges within 10 of indicated value measuring ranges other than above 0 and ticks Accuracy at...

Page 9: ...s applied Location for use Altitude 2000m or less in door use Operating temp humidity range 0ºC to 40ºC 80 or less no condensation Storage temp humidity range 10ºC to 50ºC 75 or less no condensation Withstand voltage 5160V AC 50 60Hz 5 sec Between electrical circuit and enclosure Insulation resistance 50MΩ or more 1000V DC Between electrical circuit and enclosure Auto power off Turns off the instr...

Page 10: ...red LED battery status indicator lights up E3 Influence of temperature 0ºC 40ºC The specs of this instrument are as follows Intrinsic error A within 5 of indicated value coverage factor k 2 Influence of position E1 within 15 of indicated value Influence of supply voltage E2 within 5 of indicated value Influence of temperature E3 within 5 of indicated value Max operating uncertainty B 24 The measur...

Page 11: ...ng position Illuminance sensor Detects ambient brightness to turn on off the lights LED insulation state indicator Green LED lights up measured value preset reference value Red LED lights up measured value preset reference value Insulation resistance scale Indicates the measured insulation resistance values Color coded scales for easy reading Voltage scale Indicates the measured voltage values Liv...

Page 12: ...ted Function switch Switches measurement functions and selects voltage for insulation resistance measurement 2 Side panel Name Description LINE Terminal for MODEL7260 test lead EARTH Terminal for MODEL7261A test lead LED light Illuminates the point to be measured The light automatically turns on off depending on the ambient brightness ...

Page 13: ...nst electrical shock and ensuring the minimum required air and creepage distances Other accessories 1 Carrying case MODEL9173 2 Shoulder strap MODEL9121 3 Four size AA alkaline batteries 4 Instruction manual 3 A set of test leads with alligator clip MODEL7261A Fig 5 1 1 Barrier Metal tip Insulation cap Rating of measurement category of the test lead depends on attaching removing the insulation cap...

Page 14: ...and adapters are available 1 In case of MODEL7260 The metal tip of MODEL7260 is replaceable depending on the applications 1 Standard metal tip Installed at a shipment supplied with detachable insulation cap 2 MODEL8017A Long type and helpful to access the distant How to replace the parts Turn the tip of MODEL7260 counter clockwise and remove the metal tip Insert the metal tip you want to use into ...

Page 15: ...s indicator Solid green Battery voltage is enough Blinking green Battery voltage is low Replace batteries with reference to 11 Battery replacement to perform further measurements Solid red Battery voltage is below the lower limit of the operating voltage In such a condition accuracy of the measured result isn t guaranteed Replace the batteries with new ones as soon as possible Color of LED battery...

Page 16: ... known source before taking actions as a result of the indication of the instrument 7 1 Measurement method Set the function switch to VAC DC position to measure voltage 1 Connect the test leads as the following figure shows MODEL7260 to Line terminal MODEL7261A to Earth terminal 2 Connect the black test lead to the earth side of the circuit under test and the red remote probe to the line side Fig ...

Page 17: ...for ac input and the orange LED for dc input When the measured voltage is less than 30V AC DC auto detect doesn t work CAUTION The pointer sweeps depending on the applied input even while the instrument is powered off however accuracy is not guaranteed In this state live warning LED doesn t light up Ensure the instrument is powered on to measure voltage ...

Page 18: ... It is recommended to connect the positive side to the earth side when measuring insulation resistance against ground or when a part of the object under test is earthed Such connection is known to be more suitable for insulation testing since insulation resistance values measured with the positive side connected to earth are typically less than those taken through the reversed connection DANGER Be...

Page 19: ...fety purpose If the function switch is set to this safety position the instrument doesn t start a measurement although the test button is pressed down Discontinuous warning buzzer sounds when the function switch is set to 1000V range 4 Connect the earth test lead MODEL7261A to the earth terminal of the circuit under test The live warning LED blinks and buzzer sounds if a voltage of 30V or higher e...

Page 20: ...rement Set the test button or remote control switch to off with the test leads connected Discharge can be checked with the meter blinking LED and buzzer Display example 7 Power off the instrument when measurement completes and disconnect the test leads Resistance Value Voltage Current ＲＸ Ｖ Ｉ Principle of insulation resistance measurement Fig 8 2 Fig 8 3 Fig 8 4 ...

Page 21: ...it until live warning LED goes off 8 2 Continuous measurement For continuous measurement a lock down feature is incorporated on the test button Pressing and turning clockwise locks the button in the operating position Turning it counterclockwise releases the button DANGER A high voltage is present at the tip of a probe while the test button is locked down Attention should be paid to avoid possible...

Page 22: ...below This value is calculated by dividing the nominal voltage by nominal current i e in case that the nominal voltage is 500V the lower limit of the insulation resistance is found as follows Divide 500V by 1mA equals 0 5MΩ That is insulation resistance of 0 5MΩ or more is required to provide the nominal voltage to the instrument Nominal voltage 250V 500V 1000V Lower limit of the insulation resist...

Page 23: ...10 How to disable LED insulation status indicator auto lighting in this manual for detail Reference values for each range Nominal voltage 250V 500V 1000V Reference value 0 25M 0 5M 1M Reference values are determined based on the resistance value to provide 1mA with the nominal voltage The color of LED indicates the result as follows Compared result LED insulation status indicator reference value S...

Page 24: ... LED insulation status indicator auto lighting in this manual for detail Keep the surface of the illuminance sensor clean to ensure proper detection of brightness The sensitivity of the sensor is not adjustable Cover the sensor with your finger to turn on the light manually These lights turn off automatically if the function switch is not moved or the test button is not pressed for two minutes The...

Page 25: ...atus indicator lights up to get the instrument into configuration mode Buzzer sounds intermittently while the instrument is in this mode 2 Press the test button to toggle settings The following four settings are available Settings Mode 1 2 3 4 LED insulation status indicator ON OFF ON OFF Scale light LED light ON ON OFF OFF The color of the LED indicates the currently selected mode LED insulation ...

Page 26: ...etains the selected setting It may difficult to get the instrument in configuration mode in outdoor even the sensor is covered with your finger Fig 10 2 Blinks when ON has been selected for LED insulation status indicator Blinks when ON has been selected for scale light LED light ...

Page 27: ...er must be closed and screwed before starting a measurement Otherwise electrical shock hazard may be caused CAUTION Do not mix new and old batteries or mix different types of batteries Install batteries in correct polarity as marked inside 1 Power off the instrument and then disconnect the test leads 2 Loosen one screw which is fixing the battery compartment cover andremove the cover 3 Replace all...

Page 28: ... 26 12 Shoulder strap belt attachment This instrument is equipped with a strap to suspend from the neck to allow both hands to be used freely for easy and safe operation Fig 12 1 ...

Page 29: ...rtment Partition Fig 13 1 Unit compartment 13 Storing in Carrying case Store the instrument and test leads as the following figure shows CAUTION Ensure that the instrument is powered off before storing in the carrying case ...

Page 30: ... cover and affects the meter reading use a cloth damped with off the shelf anti static agent or detergent to wipe the meter cover surface CAUTION When the pointer deflects by touching the surface of this instrument or zero adjustment cannot be made do not try to make measurement Antistatic agent has been applied to the meter cover of the instrument for electrification prevention therefore do not r...

Page 31: ......

Page 32: ...3 19 92 2297A DISTRIBUTOR Kyoritsu reserves the rights to change specifications or designs described in this manual without notice and without obligations ...

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