MULTI MEASURING INSTRUMENTS MSEI-100C User manual

INSULATION RESISTANCE TESTER FOR
PHOTOVOLTAIC SYSTEMS
MSEI-100C
INSTRUCTION MANUAL
Thank you for your purchasing our model MSEI-100C
INSULATION RESISTANCE TESTER FOR DC CURRENT
CIRCUIT OF PHOTOVOLTAIC SYSTEMS.
Before use the instrument, read this instruction manual
thoroughly and operate it correctly.
Keep this instruction manual carefully to take out whenever
you need.
MULTI MEASURING INSTRUMENT CO., LTD.
Akihabara Murai Bldg. 7F, 1-26 Kanda Sakuma-cho,
Chiyoda-ku, Tokyo 101-0025 JAPAN
TEL: [phone]
FAX: [phone]
Website: http://www.multimic.com
E-mail: [e-mail]

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SAFETY SUMMARY observe by all means
● To use this instrument safely, read this "SAFETY SUMMARY" carefully and apply the
instrument correctly.
● The CAUTIONs and WARNINGs which appear on the following pages are stated
to prevent the operator & other people from the dangers and their properties from the
damages beforehand.
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！
WARNING : This symbol indicates the contents "Possibilities of the death or
the serious wound can be supposed" caused from mis-operations.
△
！
CAUTION : This symbol indicates the contents "Possibilities of the injury or
only the material damage can be supposed" caused from mis-
operations.
○ OPERATION ENVIRONMENT
△
！
CAUTION
● Do not use or storage this instrument under the condition of direct rays of the sun,
high temperature & humidity and or condensation, as it may cause the
deformation and or the isolation defect of the instrument.
● Do not use this instrument in the environment influenced by acids, alkalis, organic
solutions, corrosive gas, etc.
● Do not use or storage this instrument where the mechanical vibration can be directly
transmitted, as it may cause defect of the instrument.
● Do not use this instrument nearby the appliances which generate strong magnetic
field and or electric field, as it may cause mis-movement of the instrument.
● This instrument does not have the water/dust-proof structure. Do not use this
instrument in the environment with a lot of dust and drops of water, as it may cause
defect of the instrument.
○ OPERATION CONDITION & CONNECTION
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！
WARNING
POSSIBLE ELECTRICAL SHOCK
● This instrument is for the use of low voltage circuit.
● Do not make measurements of power lines carrying more than AC/DC 600V. Before
use, check and confirm the voltage of circuit to be measured.
POSSIBLE ELECTRICAL SHOCK OR ACCIDENT
● Do not handle the instrument in the rain, at humid place, with a drop of water and or
with wet hands.

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1. GENERAL
This insulation resistance tester (MSEI-100C) can measure insulation resistance
of DC current circuit in PV systems (between PV module and power conditioner)
on the live line and can distinguish the deteriorated part between Power Phase,
Neutral Phase, P/N Phase and or PV modules.
2. BEFORE USE
After opening the package, check the appearance of instrument and
confirm if there is no lack of accessories. If any damage and or any lack has
been found, contact the dealer you bought this instrument.
《Accessories》
Voltage Input Connector（Red, Black,
and, Green）
1 set
Instruction Manual 1 pce.
Carrying Case 1 pce.
Battery (LR6) 4 pcs.
3. CONNECTION & OPERATION OF CONNECTOR CORD & ACCESSORIES
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!
WARNING
△
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CAUTION
Connect voltage input cords to the live lines after connected to the instrument.
Be careful that the short circuit and or electric shock accident might be caused from
slip off of the clips and touch of them between 2 lines.
Before use, check the connecting cables (including AC adaptor) about
disconnection, contact failure, breakage of coating conductor, etc. In case of finding
any unusual point after inspection, do not use these accessories.
For the safe operation
Do not drop and or give the hand shock to the instrument.
Do not put heavy material to each cable and do not modify it.

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4. NAME OF PART & EXPLANATION
（Name of Part & Explanation）
①Battery Case : For battery installation
②AC ADP Jack : For connecting AC adaptor(option)
③Contrast Volume : For adjusting display contrast
④Left, Right, Up, Down Switch : For moving cursor on display and setting value
⑤Display (LCD) : 20 letters/characters x 4 lines LCD, for displaying
settings item for measuring condition and numeral values.
⑥Input Switch (ENT) : For inputting measurement condition or value
⑦Power Switch (POWER) : For switching ON and OFF. Automatically off in approx.
after 40 minutes
⑧Menu Switch : For returning to initial screen
⑨Insulation Resistance Lamp : For displaying judgment for insulation condition by LED
⑩Voltage Input Terminal : For connecting Red lead to P Phase, Black lead to N
Phase, and Green lead to E Phase.
190
42
140
⑩
②
⑦
⑧
⑤
③
①
⑥
④
⑨

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5. OPERATION PROCEDURE
5.1 Preparation before use
1) Place the battery
1. Unscrew and slide a battery cover to remove a battery
cover(as shown at right)
2. Place the battery observing correct polarity as
indicated in the battery compartment. Use four
LR-6(AAA) batteries.
3. Install the battery cover and tighten the screws.
△
!
WARNING
△
!
CAUTION
It may cause electric shock.
Never replace the battery during a measurement.
Be sure to set back the battery cover to original position. Never make measurement
when left the battery cover opened.
It may cause malfunction.
When the instrument will not be in use for a long period, place it in storage after
removing the batteries.
Do not mix old and new batteries.
Do not use the battery not specified in the instruction.

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2) Use AC adaptor for long time use.
1. Insert the plug of AC adaptor to the jack of
the instrument body(AC ADP).
2. Connect AC adaptor to the outlet(AC 100V).
△
!
WARNING
Built-in battery is supplementary for
unexpected power failure. Normally,
use AC adaptor included in the
package.
Do not input power to AC adaptor except the indication, as it may cause a fire.
Do not touch the plug with wet hands or in the condition of water drops, as it may cause
electrical shock.
Do not use AC adaptor (options) other than accessory, as it may cause damage of
instrument and or electrical accident.

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5.2 OPERATION PROCEDURE
1) Once press POWER switch ⑦
[SEI-100C Ver.] appears on the display and
[ZERO setting] will be displayed for a few seconds
after lightening LED of display judgment.
Then, [Top Menu](initial display) will appear.
2) Connection of Test Leads (Standard Accessory)
Connect test lead(Red) to P phase, (Black) to N phase and (Green) to E of the instrument
body.
Connect alligator clip of each test lead to measuring point.
※Make off the disconnector between PV panels and power conditioner.
Modules Modules Modules
PV Systems
N Phase(－)
P Phase
(+) Red
Green
GND
Power Cond t oner
Black
D sconnector
(Top Menu)
■Measure
Operate Memory
Set Conf gurat on
In t al Screen

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3) Display before measurement
Set the cursor to Measure and press ENT switch ⑥once.
Display will become as under:
4) Start of Measurement
Press again ENT switch ⑥and then, measurement will start.
Vrp and Vrn are measured at the point of OS by decreasing each measuring time.
・To stop the measurement on the way, press ENT switch ⑥once.
・To start the measurement again, press ENT switch ⑥once again.
・Top Menu display will appear before or during measurement in case of press MENU switch
②.
5) Display of Measurement Result
Measurement will be made at respective points by measuring time. Respective insulation
resistance values are displayed and the insulation condition lamp lightens.
(1) Good (Green) Lamp Lightening
Green lamp lightens when Rp (P phase insulation resistance), Rn (N phase insulation
resistance) & Rpn (insulation resistance between PN phase and PV modules), all are more
than 1MΩ.
Rr ： *.***kΩ 05/17
V ： ***.* V 13：38
Vrp : ***.* V 30S
Vrn : ***.* V 30S
Internal Standard Res stance→
P Phase Voltage→
Generated Voltage→
N Phase Voltage→
Present T me
Measur ng T me
Rr ： 4.966kΩ 05/17
V ： 300.0 V 13：40
Vrp : -497.1m V 0S
Vrn : ***.* V 28S LO
D splay Example of Measurement
D splay Example of Measurement Result
D splay for Low Battery
(Replace the batter es n th s case)
V ： 300.0 V 05/17
R p ： 10.00MΩ 13：43
R n : 10.00MΩ
Generated Voltage→
N Phase Insulat on Res stance→
P Phase Insulat on Res stance→

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(2) No good (Red) Lamp Lightening
In case that the judgment is as no good, the corresponding lamp (P phase failure, N phase
failure, PN phase failure) lightens.
・To start the measurement again, press ENT switch ⑥once again,
・Top Menu display will appear before or during measurement in case of press MENU swtch
⑧.
(3) Series Panes Numbers Input (Orange) Lamp Lightening
In case that there is insulation resistance failure, [Serial Panel Number Input Lamps]
(Orange) lightens and [Set Module] is displayed on LCD. In case that the alteration for PV
module numbers requires, the change of numbers can be made by UP↑& DOWN↓switch
④. The setting limit is 2～19.
After setting, press ENT switch ⑥and the judgment result is displayed.
・In case that the judgment is good, [Good] lamp lightens.
・In case that the judgment is no good, the corresponding lamp (P Failure, N Failure, PN
Failure, Rpn Failure) lightens.
In case of Rpn Failure, Rpn lamp (Red) lightens and the failure point is displayed on LCD at
the same time.
・To start the measurement again, press ENT switch ⑥once again.
・Top Menu display will appear before and during measurement in case of press
MENU switch ⑧.
V ： 300.0 V 05/17
R p ： 0.20MΩ 13：51
R n : 0.50MΩ
Set Module ： 12
D splay Example of Measurement Result
Generated Voltage→
N Phase Insulat on Res stance→
P Phase Insulat on Res stance→
PV Module Numbers→
V ： 300.0 V 05/17
R p ： 0.96MΩ 13：57
R n : 5.02MΩ
Rpn ： 0.63MΩ PS : 6
D splay Example of Judgment Result
Generated Voltage→
N Phase Insulat on Res stance→
P Phase Insulat on Res stance→
Insulat on Res stance between Modules→ ←Module Fa lure Po nt
PS: ※※ s the number from P d rect on. In case of 1, t means nsulat on fa lure
between 1 and 2 and n case of 6, between 6 and 7.

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5.3 FUNCTION SETTING
1) Measurement Time Setting (Set Timer)
(1) Press DOWN switch twice
at the initial display (Top Menu)
and set the cursor to Set Configration
and then, press ENT switch.
(2) Set Timer 30 sec. is displayed and
Press ENT switch.
(3) Using UP↑& DOWN↓switch ④.
Set the cursor to appropriate point and then,
Press ENT switch once.
(4) Measuring Time will be set.
2) Present Time Setting (Now Time)
(1) Press DOWN switch twice at
the initial display (Top Menu)
and set the cursor to set Configuration
and then, press ENT switch.
↓ENT Sw tch
■Set T mer 30sec
↓ENT Sw tch
(Set T mer)
30sec 600sec
■180sec 900sec
300sec
↓ENT Sw tch
■Set T mer 180sec
※Operate Memory cannot be used
↓ENT Sw tch
(Top Menu)
Measure
Operate Memory
■Set Conf gurat on
Cursor
L ghten ng→
※Operate Memory cannot be used.
Measur ng t me means the t me after the connect on of nstrument nternal standard
res stor to each phase to measure voltage between standard res stors. The sett ng
t mes are 30 sec., 180 sec., 300 sec., 600 sec., and 900 sec.
(Top Menu)
Measure
Operate Memory
■Set Conf grat on
In t al D splay
Cursor
l ghten ng→
In t al D splay

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(2) Set Timer 30 sec. is displayed and
press DOWN↓switch.
(3) Now Time (System) is displayed. Press
ENT switch and set the present time.
(4) By UP↑switch and DOWN↓switch, set the
numerical value and by RIGHT switch, move
the underline (_) to the right. After adjusted
minute, press ENT switch according to the
time-signal.
・After finished all setting, press MENU switch once and return to initial display (Top
Menu).
●Replace of Batteries
When [Lo] is displayed, replace the batteries (page ), as the voltage of batteries are
getting low.
●When the display does not appear even by pressing Power Switch.
・The display may get thinner at the adjustment of CONTRAST. Adjust the display
contrast by turning the contrast knob to the left.
・Check the voltage of batteries.
△
!
WARNING
↓DOWN Sw tch
(Now T me)
2013/05/17 14:26
↓ENT sw tch
■Set T mer 30sec
■Now T me(System)
2013/05/17 14:26
Voltage Input
Do not input voltage by test lead during a few second displaying “ZERO Setting” on
LCD after power-on, as zero-adjustment is being done automatically at the inside of
instrument.
Apply the clips of each voltage input lead to the measuring point after appeared
「Top Menu」(initial display) on LCD.

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6. SPECIFICATIONS
6.1 MEASUREMENT SPECIFICATIONS
1) Detection Method : DC Voltage measurement between the earth by standard
resistor.
2) Measurement Items : Generated Voltage (DCV), P Phase Insulation Resistance, N
Phase Insulation Resistance, PN Phase Insulation Resistance,
Insulation Resistance between modules, Standard Resistance
Value.
3) Measuring Range : Generated Voltage (V): DC0.01V～599.9V (5 range auto)
Insulation Resistance (MΩ): 0.01 MΩ～19.99 MΩ, OVER
(exceeded 19.99 MΩ)
・P Phase Insulation Resistance (Rp)
・N Phase Insulation Resistance (Rn)
・Insulation Resistance between P Phase, N Phase and
Module (Rpn)
※Insulation resistance values are calculated by the formula.
4) Judgment Method When the insulation resistance value is getting lower than 1.00
MΩ, LED of failure point lightens. In case that there is no
problem for insulation resistance value, [Good] LED lightens.
LED Color: Good LED-Green
No Good LED-Red
・Judgment whether PN Phase or between modules is made by
calculation from numbers of module.
5) Display Part : 20 letters/characters x 4 lines. LCD
6) Actual Time Display : Year, month, date & time on the display
7) Actual Time Accuracy : ±200ppm±10 sec. (at 25℃)
8) Measurement
Accuracy
: Generated Voltage: ±1%rdg±10dgt
Insulation Resistance: ±5%rdg

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5.2 FUNCTION SPECIFICATION
1) Measuring Time
Setting
: 30 sec., 180 sec., 300 sec., 600 sec., and 900 sec.
2) Time Function : can set the present time
3) Module Number
Setting
: can specify the insulation failure point between which modules
by input of PV module numbers, in case that there is
insulation failure between modules,
Setting Module Numbers: 2～19
4) Auto Power-off
Function
: After final switch operation, automatically power of in approx.
40 minutes.
5) Contrast Knob : Knob to adjust the depth of display on LCD.
6) Power Supply Source : 1) AA alkaline battery LR-6x4
2) AC adaptor (option)
7) Current Consumption : Approx. 30mA
8) Dimension & Weight : 190(W) x140 (H) x42 (D), approx. 600gs
9) Accessories : Voltage Input Cable 1 set (One each Red, Black, Green)
Carrying Case 1 pce.
Instruction Manual 1 pce.
AA alkaline battery LR-6x4

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7. Repair Service
When requesting for repair service, please bring the instrument directly to the dealer where
you bought.
When mailing the instrument, always pack it in its original or equivalent packing materials to
avoid any damage during the transportation and also put together with documents showing
your name, address, phone number and defect point.
8. Warranty
This instrument is sent out from our factory after the sufficient internal inspections but if you
find any defect due to the fault in our workmanship or the original parts, please contact the
dealer where you bought the instrument.
The warranty period is 12 months from the date of purchase and instrument shall be
repaired at free of charge, provided that we judge the cause of defect is obviously
resulted from our responsibility.