MSG Equipment MS021 User manual
2022.10.27
MS021
TESTER FOR DIAGNOSTICS OF DIODE BRIDGES
OF ALTERNATORS
USER MANUAL
TESTER DIAGNOSTYKI MOSTKÓW DIODOWYCH
ALTERNATORÓW
INSTRUKCJA OBSŁUGI
ТЕСТЕР ДЛЯ ДИАГНОСТИКИ ДИОДНЫХ МОСТОВ
ГЕНЕРАТОРОВ
РУКОВОДСТВО ПО ЭКСПЛУАТАЦИИ
UNIQUENESS
TRAINING
SERVICE
INNOVATION
WARRANTY
QUALITY
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User manual
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CONTENTS
INTRODUCTION....................................................................................................................................................4
1. PURPOSE...........................................................................................................................................................4
2. TECHNICAL CHARACTERISTICS.....................................................................................................................5
3. EQUIPMENT SET ..............................................................................................................................................5
4. TESTER DESCRIPTION....................................................................................................................................6
5. APPROPRIATE USE.......................................................................................................................................... 7
5.1. Safety regulations............................................................................................................................... 8
5.2. Rectifier testing................................................................................................................................... 8
5.3. Tester setup.........................................................................................................................................10
6 TESTER MAINTENANCE .................................................................................................................................10
6.1. Cleaning and care .............................................................................................................................. 11
7. MAJOR FAULTS AND RECOVERY TECHNIQUES......................................................................................... 11
8. EQUIPMENT DISPOSAL ................................................................................................................................ 11
CONTACTS...........................................................................................................................................................12
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Tester MS021
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INTRODUCTION
Thank you for choosing the product by ТМ MSG Equipment.
The present user manual consists of the information on the application, supply slip, design,
specifications and rules of usage of tester MS021.
Prior to using the tester MS021 (hereinafter, “the tester”), study the present user manual
thoroughly. If required, get the special training at tester manufacturer facilities.
Testing rectifiers with the use of multimeter has always been the most common practice. This
method has a significant drawback -it doesn't help to identify the diode type and find the faulty
one. A standard multimeter test with a direct current of about 0.002A, which is too low compared
to the diode operating currents. The tester checks the diode with an alternating current of 0.9A,
which allows you to reliably assess the technical condition of the diode bridge of the generator
or the diode separately.
1. PURPOSE
The tester MS021 is used during the alternator repair for the diagnostics of diode bridges, and it
can detect:
•diode breakdown;
•diode cut;
•diode type (common diode, avalanche diode);
•diode degradation (extreme drop of forward voltage);
•avalanche diode reverse breakdown voltage;
•bad diode connection with the bus bar.
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User manual
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2. TECHNICAL CHARACTERSISTICS
General
Supply voltage, V
230/110
Supply frequency, Hz
50/60
Supply type
Single -phase
Power demand (max.), W
40
Dimensions (L×W×H), mm
219×214×80
Weight, kg
2
IP rate
IP20
Diode bridge diagnostics
Voltage of the tested diode bridges, V
12/24
Testing current
alternating
Testing voltage, V
30
Testing current, A
0.9
3. EQUIPMENT SET
The equipment set includes:
Item name
Number of
pcs
Tester MSG MS0121
1
MS0129 – diagnostic cable
1
Supply cable
1
Diode fuse – (type: 5*20mm, current: 0.5A)
1
User Manual (card with QR code)
1
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Tester MS021
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4. TESTER DESCRIPTION
The tester is supplied with a touch screen (“1” - Fig.1) on which the tested parameters are
displayed; the color indication of the screen signals the technical condition of the tested diode.
There is a connection terminal (“2” - Fig.1) for a diagnostic cable (Fig.2). The encoder knob (“3” –
Fig.1) is used for fine adjustment of the device for specific tasks. Button “4” turns the device on.
Fig.1 MS021 tester. General view:
1 – Touch screen; 2 – Connection terminal for a diagnostic cable;
3 – Encoder button; 4 – “ON” button.
Fig.2. Diagnostic cable
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Diode fuse and power connectors are located at the rear of the device.
Fig.3. MS021 tester. Back view:
1 – Diode fuse; 2 – Power connector.
5. APPROPRIATE USE
1. Use the tester as intended (see Section 1).
2. The tester is designed for indoor use. Be aware of the following operating constraints:
2.1. The tester should be used in the spaces equipped at the temperature range from +10 °С
up to +30 °С.
2.2. Do not use the device when the air temperature is negative or the humidity is high (over
75%). Do not turn on the tester immediately after moving it from a cold room (or from outdoors)
into a warm one as its components may be covered with a condensate. Keep it off at room
temperature for at least 30 min.
2.3. Avoid leaving the device in direct sunlight.
2.4. Keep away from heating devices, microwaves, and other temperature-raising equipment.
3. Avoid dropping the tester or spilling technical liquids on it.
4. Any interference with the electric diagram of the device is strictly prohibited.
5. Turn off the tester when it is not in operation.
6. Do not leave the device with closed probes for more than 2 minutes.
7. Working with a measuring probe, keep your fingers on the plastic part of it. Touching the metal
part of the measuring probe may cause measurement errors.
8. The device is equipped with a system for diagnostics of the probes condition. If any fault is
detected, the "PROBE PROBLEM" message will appear on the screen. The "DIODE BREAKDOWN"
message that appears when the probes are open, signals the probe failure.
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Tester MS021
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5.1. Safety regulations
1. 0nly the personnel that has received special training in safety operation and been authorized
to work with the test benches (devices) of certain types is allowed to use the device.
2. Make sure that measuring clamps do not have insulation damage or bare metal spots. Check
the clamps for any breaks. In case of obvious damage, replace them with the new ones before
launching the device.
5.2. Rectifier testing
Diagnostics of a rectifier should be performed as follows:
1. Turn the tester on. Connect the clamp tothe rectifier housing. The following message will appear
on the screen: “CONNECT PROBE TO DIODE”.
2. Touch the contact spot of the tested diode with a probe. The following information will be
displayed:
“Vf” – diode voltage drop (in volts);
"Vr" - stabilizing voltage (in volts). If there are stabilitrons (avalanche diodes) in the rectifier
structure, the "AVALANCHE" message will appear.
WARNING! Different contaminants and dirt on the tested contacts may lead to measurement
errors.
Fig.4. Taking measurements.
А) – incorrect; B) – correct
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2.1. If the diode is faultless, the screen will display “Vf” and “Vr”
values. The screen color will be green.
2.2. If the "Vf” value is higher than normal, the screen color will be
yellow.
The operability of the rectifier should be decided on the basis of the “Vf” readings and type
(model) of the diode (stabilitron). The “Vf” absolute value is not always a key parameter when
checking the rectifier. It is important to pay attention to the spread between the “Vf” values of
different diodes of the same rectifier. For example, for a rectifier that can carry 50 A, “Vf” = 0.850
V is quite typical. The rectifier can be considered faultless If the spread between “Vf” values of
the diodes doesn’t exceed ± 0.020 V. For the 120A rectifier, "Vf" = 0.850V is already a critical value.
The diode with such a "Vf" value shall be considered faulty.
2.3. If the diode is faulty, the screen color will be red.
2.4 In case of a short or open circuit failure, the screen color will be red and either the “SHORT
CIRCUIT’ or ‘DIODE BREAKDOWN’ message will be displayed correspondingly.
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Tester MS021
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5.3. Tester setup
The device assesses the diode performance on the basis of the forward voltage drop value (“Vf”)
and is specially calibrated to make it usable for any operator who doesn’t have sufficient
knowledge of the diode parameters and characteristics. Threshold values can be changed at the
user’s option.
Enter the “Settings” menu as follows:
Fig.5. Color threshold setting menu.
1) Turn the device off.
2) Press and hold down the encoder button (“3” – Fig.1) 3)Turn the device on. A setup mode will
be activated.
4) Threshold values for either a faultless diode (green color of the screen) or a faulty one (red
color of the screen) can be changed in this mode.
5) The selected threshold value can be changed by turning the encoder button clockwise or
counterclockwise.
6) To save the selected settings, press and hold down the encoder button until the device enters
the operating mode and the “CONNECT PROBE TO DIODE” message appears on the screen.
7) Turn the tester off to exit the setup menu. The settings won’t be saved.
6. TESTER MAINTENANCE
The tester is designed for a long operation life and doesn’t have any special maintenance
requirements. At the same time, to ensure the maximum operation life, the regular monitoring of
the tester technical condition should be made as follows:
- conformity of the environmental conditions to the requirements for tester operation
(temperature, humidity, etc.);
- diagnostic cable visual inspection;
- condition of the supply cable (visual inspection).
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