gs yuasa GYT250 User manual

Quick start guide
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1. Overview
The GYT250 can perform warranty, health and stock tests on conventional, EFB, AGM and leisure batteries. It can also
give a comprehensive overview of a vehicle’s starter and charging system health through alternator, starter and earth
checks. Results can be printed using the built-in thermal printer or transferred to a computer via the SD card.
2. Connections & controls
The red positive connection (2) should be attached to the battery’s positive terminal (+). The black negative connection (3)
should be connected to the battery’s negative (-) terminal. The unit will then power up.
1 – Colour LCD display
2 – Red positive (+) connection
3 – Black negative (-) connection
4 – SD card slot
5 – Navigation buttons
6 – ENTER button
7 – BACK button
8 – PRINT button
9 – Printer paper out indicator (GREEN)
10 – Printing in progress indicator (RED)
11 – Thermal printer
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3. Printer paper installation
1. Open the printer cover and insert a roll of thermal
printer paper
2. Close the cover making sure the thermal paper is held
between the feed rollers
3. When the paper needs replacing the printer paper out
indicator (9) will ash
4. Home screen
When the GYT250 is connected to a battery, the home
screen will be displayed. From here it is possible to start a
test, manage previous results and congure the tester.
5. Settings menu
5.1 Set workshop name & contact details
1. Select Settings > Details
2. Use keys to select a character, then press
ENTER
3. To move to another line, select navigation key
then
press ENTER
4. The
character will appear, and the cursor can
be moved to next line
5. Select the navigation key again to return to normal
edit mode
6. Once all details have been entered select save icon
then press ENTER
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5.2 Set time & date
1. Select Settings > Time/Date
2. Use + to move between entries, then use
+ to set the time and date
3. Press ENTER
to conrm and exit
5.3 Set sound
1. Select Settings > Sound
2. Press to turn sound OFF or to turn sound ON
3. Press ENTER
to conrm and exit.
6. Starting a new test
1. To start a new test, rst select
Test from the Home Screen
2. Select the type of vehicle to be tested
3. Select the type of test required
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7. Battery Test
The following tests help determine battery health during
warranty, in-service or pre-service checks
1. After selecting Battery Test, choose type of battery
test required
Warranty - For testing of batteries presented for warranty
claims
Health Check - Determines the state of health, Voltage &
CCA performance of batteries that have been used on a
vehicle
Stock Check - For battery stock management testing of
new batteries that are in storage prior to being installed
in a vehicle
Note: Depending on the vehicle type selected, not all
battery tests will be available
2. Follow the sequence below to enter battery details
Enter type > Enter test standard >
Set battery rating > Testing starts
3. After testing, the results will be displayed
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Note: Depending on the test type selected presentation of results will differ
Result / action Note
Battery is OK
No action required
Battery is OK
But a recharge is recommended
Battery is discharged
Re-charge before testing again
Battery is weak
Replacement recommended
Service-related failure (rejected claim
under warranty test)
Bad Cell detected
Replacement recommended
Manufacturing defect (accepted claim
under warranty test)
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7.1 Print results
1. Press PRINT button (8) then select required
print option
2. If Quick Print is selected, results are printed without
adding a customer reference
3. If Customer Details are selected then a reference
(e.g. vehicle registration) can be added by navigating
the keyboard
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4. When nished, select the save icon to exit and
results will be printed
8. Starter Test
This test helps determine the condition of the starter
motor and battery during engine cranking. The drop of
battery Voltage during the starting process is measured.
This can indicate if the battery has aged or the starter
motor has a problem.
1. After selecting Starter Test the Voltage trace will be
displayed
2. Start the engine and the results will be automatically
recorded
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3. After analysis results will be displayed
Result / action
Battery Volt drop is OK
No action required
Battery Volt drop too high
Check battery, starter &
connections
4. Results can now be printed (see section 7.1)
9. Alternator Test
This test conrms if the alternator charging Voltage is
within the correct limits to avoid under or overcharging of
the battery. There are three parts to the test:
• Unloaded (Upper Voltage) check – High engine
revs with accessories OFF
• Loaded (Lower Voltage) check – Low engine revs
with accessories ON
• Diode Ripple check – Idle engine revs with
headlights ON
1. After selecting Alternator Test choose the alternator
type which matches the vehicle. If in doubt choose
Normal. Next generation vehicles with micro-hybrid
technology (including Start-Stop and regenerative
breaking) would typically have a smart alternator.
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9.1 Unloaded (Upper Voltage) Test
1. Ensure all vehicle accessories are switched OFF
2. Rev the engine to 3000rpm, press ENTER
then
hold revs for 10 seconds
Press ENTER > Hold for 10 secs
3. The analyser will automatically move to the next step
9.2 Loaded (Lower Voltage) Test
1. Ensure all vehicle accessories are switched ON e.g.
lights, heater, demister
2. Rev the engine to 2000rpm, press ENTER
then
hold revs for 10 seconds
Press ENTER > Hold for 10 secs
3. The analyser will automatically move to the next step
9.3 Diode Ripple Test
1. Ensure that only the vehicle lights are switched ON
2. Set the engine at idle revs (700-1000rpm), press
ENTER
then wait for 10 seconds
3. The analyser will automatically move to the next step
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9.4 Alternator results summary
1. After analysis results will be
displayed
Results can now be printed (see section 7.1)
The tables below show the acceptable Voltage ranges for
each type of vehicle and alternator. Any values outside of
these ranges will be highlighted in the results.
Normal
alternators
12V vehicles 24V vehicles
MIN
Voltage
MAX
Voltage
MIN
Voltage
MAX
Voltage
Unloaded
(Upper Voltage)
Test > 13.3V < 15.0V > 26.6V < 30.0V
Loaded
(Lower Voltage)
Test > 12.6V > 13.8V > 25.2V > 27.6V
Smart
alternators
12V vehicles 24V vehicles
MIN
Voltage
MAX
Voltage
MIN
Voltage
MAX
Voltage
Unloaded
(Upper Voltage)
Test > 12.4V < 16.2V > 24.8V < 33.0V
Loaded
(Lower Voltage)
Test > 12.0V > 12.4V > 24.0V > 24.8V
10. Earth Test
This test checks that the earth connections between
battery, engine and vehicle chassis are in good
condition. A high resistance caused by loose or corroded
connections can lead to poor starting.
10.1 Test procedure
1. First select Earth Test then press ENTER
2. Move the GYT250 black clamp from the battery
negative terminal (-) to a suitable position on the
vehicle chassis and press ENTER
for analysis to
take place
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Press ENTER > Analysis
3. Within 15 seconds, move the black clamp from
the vehicle chassis back to the battery negative
terminal (-)
Press ENTER > Analysis
4. After analysis results will be displayed
Result / action
Earth connection is OK
No action required
High resistance detected
Check for loose or
corroded connections
Earth not detected
Check contacts & repeat
procedure
Note: The test can be repeated to check the earth
between battery and engine. This time move the clamp
from the battery negative terminal (-) to a suitable metal
part on the engine.
5. Results can now be printed (see section 7.1)
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