Garland SH/BA 3500 User manual

Service-Manual Single, version 03/01 18.09.03 page 1of 28
SERVICE-MANUAL
SINGLE
INDUCTION COOKERS
Type SH/BA 3500
Type SH/BA 5000
Type SH/IN 3500
Type SH/IN 5000
Type SH/WO 3500
Type SH/WO 5000
Type SH/WO/IN 3500
Type SH/WO/IN 5000

Service-Manual, new version author: Chr. Fuchs 17.06.99 / INDUCS Ltd. 18.09.03 page 2of 28
CONTENT PAGE
1Safety 3
1.1 Description of danger signs 3
1.2 Qualification and training of personnel 3
1.3 Safety prescriptions for installation and service 3
1.4 Unauthorized reconstruction and use of spare parts4
1.5 Improper operating methods 4
2Technical Information 5
3Functioning 6
3.1 Adjusting the performance rate 6
3.2 Checking the temperature 6
3.3 Protection overload current 6
4Surroundings of installation 7
4.1 Pan material for induction cookers 7
5Tests 8
5.1 Pan detection 8
5.2 Power rating 8
5.3 Maximum rating 9
5.4 Current 9
5.5 Fan 10
5.6 Test components 10
5.6.1 Power board 10
5.6.2 Rectifier 11
5.6.3 Transistor module 11
6Maintenance / Service 12
7Fault finding 12
7.1 Generally 12
7.2 Error messages 13
7.3 Flux plot 14/15/16/17
7.4 Fault finding / Troubleshooting guide 18
7.5 Fault repair 20
8Exchange of spare parts 21
8.1 To open the cooker 22
8.2 Power print C016, C031 22/23
8.3 Logic print C018 22
8.4 Transistor module 23
8.5 Rectifier 23
8.6 Fan 24
8.7 Temperature sensor heat sink 24
8.8 Temperature sensor coil 24
8.9 Repair of spare parts 24
9Appendix 25
9.1 Logic print C018 25
9.2 Power print C031 26
9.3 Power print C016 27
9.4 Signal connector ST1 28

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1Safety
1.1 Description of danger signs
The safety information which may cause
danger for people (personal injury) at
non-observance is specially marked with
the general danger symbol
The electrical connection must be made
by an expert.
CAUTION Is used if there is a hazard or unsafe
practice which could result in minor
personal injury or property damage
1.2 Qualification and training of personnel
The staff for assembly, installation, commissioning, operation and maintenance must have
the appropriate qualifications. The field of responsibility, competence and supervision of the
staff must be defined and controlled.
1.3 Safety prescriptions for installation and service
The operating personnel has to make sure that the installation and service as well as all
inspection is done by authorized and qualified personnel. This personnel must have read
very carefully the „Instructions for use“ in order to meet the requirements. For installation,
service, maintenance, repair and overhaul of the induction cookers, the personnel has to be
specially qualified and must have attended a special training, authorized by the
manufacturer.
In principle, such work on induction appliances must only be carried out when it has no
electrical tension. The cookers must be switched off and disconnected from the electric
connection. The installation of safety and protection have to be re-installed after finishing of
the work.

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1.4 Unauthorized reconstruction and use of spare parts
Reconstruction of the cooker or changes to the cooker are not allowed. Contact the
manufacturer if you intend to make any changes on the cooker. To guarantee safety, just
use genuine spare parts and accessories authorized by the manufacturer. The use of other
components cancels any liability for the resultant consequences.
1.5 Improper operating methods
The operating reliability of the cookers can only be guaranteed with appropriate application
of the cooker. The limit values may be exceeded on no account.

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2Technical Information
Base-Line
Type 3500
SH/BA, SH/IN 208 V / 1 ph 230 V / 1 ph 240 V / 1 ph
Wattage kW 3.5 3.5 3.5
Current A 17 16 15
Power factor
Cos > 0.95 > 0.95 > 0.95 > 0.95 > 0.95 > 0.95
Discharge rate mA 4 4 4
∅coil mm 195 210 210
Type 5000
SH/BA, SH/IN 208V/ 3 ph 400 V / 3 ph 440 V / 3 ph
Wattage kW 5.0 5.0 5.0
Current A 14 8 7
Power factor
Cos > 0.95 > 0.95 > 0.90 > 0.95 > 0.90 > 0.95
Discharge rate mA 4 4 4
∅coil mm 210 210 220
Wok-Line
Type 3500
SH/WO, SH/WO/IN 208 V / 1 ph 230 V / 1 ph 240 V / 1 ph
Wattage kW 3.5 3.5 3.5
Current A 17 16 15
Power factor
Cos > 0.95 > 0.95 > 0.95 > 0.95 > 0.95 > 0.95
Discharge rate mA 4 4 4
∅Ceramic bowl mm 260 260 260
∅coil mm 240 240 240
Type 5000
SH/WO, SH/WO/IN 208 V / 3 ph 400 V / 3 ph 440 V / 3 ph
Wattage kW 5.0 5.0 5.0
Current A 14 8 7
Power factor
Cos > 0.95 > 0.95 > 0.90 > 0.95 > 0.90 > 0.95
Discharge rate mA 4 4 4
∅Ceramic bowl mm 260 260 260
∅coil mm 240 240 270
Max. tolerance of power supply Nominal voltage +6 / -10%
Frequency 50/60 Hz
Protection class IP X0
Min. diameter of pans Ca. 12 cm
Max. ambient temperature: stockage -20 to 70ºC/ 0 to + 160º F
Max. ambient temperature: function -5 to 40ºC/ -40 to 110 ºF
Max. relative humidity of air: stockage 10 to 90%
Max. relative humidity of air: function 30 to 90%

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On the power board, a main filter for the interference suppression is integrated
Certifications
Satisfies the latest specifications: VDE EN 60335-1/-2/36, UL 197; CAN/CSA/C 22.2 No.
109, SSF 4-1996, CE-compliant.
Constructions
The cookers are made of stainless steel (CNS 1.4301). The case is sealed. The mounting
of the vitrocerame as well as of the ceramic bowl is done with screws.
3Functioning
3.1 Adjusting the performance rate
The performance rate is adjusted by the potentiometer (control knob). The inductive
performance is depending on the position of the potentiometer: Position 1 = minimum
power, Position 10 = maximum power.
3.2 Checking the temperature
Induction coil
The temperature of the induction coil is checked by a temperature sensor. If the coil is
heated over the maximum power, the heating process is stopped. As soon as the coil has
cooled down, the Induction unit may be re-started. Turn the position of the kontrol knob on
„0“ and then on the desired power.
Power board
The temperature of the power board is checked by a temperature sensor. As soon as the
heat sink is heated over 55ºC/130ºF, a cooling fan is started. Temperatures of the heat
sinks of more than 70ºC/ 160ºF will reduce automatically the checking of the power in order
to keep the induction cooker working under normal conditions.
Print
The temperature of the print is checking the ambient temperature of the appliance. As soon
as the temperature is higher than the programmed value the heating process is stopped. It
can be re-started as soon as normal conditions are reached.
3.3 Protection overload current
Detecting inapproriate pan material or magnetic objects on the heating area, the current in
the induction coil may be essentially raised. In order to protect the power board,
the current in the coil is checked. As soon as the current in the coil exceeds the tolerance,
the generator is blocked and there is no further aktive exchange of energy. He will be re-
started as soon as normal working conditions are reached.

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4Surroundings of installation
The electrical connection must be made
by an expert.
Please follow the following rules:
•Verify and make sure that the electric potential of the main conductor corresponds with
the specification plate.
•The electrical connections must satisfy local house installation regulations. The valid,
national and local regulations of the electricity-supply inspection authorities must be
observed.
•The induction cooker is equipped with a flexible cable which must be connected to a
wall socket.
•When faulty-current circuit breakers are used, they must be rated for a breaking current
of 30mA or more.
The cooker has to be set up on a even place like a table and requires an area of at least
400 x 480 mm. The air inlet and air outlet may not be obstructed, the place must be able to
withstand a loading of 40 kg. The cooker doesn’t have to be fixed on the table. The control
knob to operate the cooker must be easily accessible.
To guarantee proper operation of the cooker, the ambient temperature must be within the
range of -5º to 40ºC / -40º to 110º and humidity of air between 30% to 90 %
The cooker may not be exposed to jet of water.
Induction cooker, Model ...-Flat
d: minimal distance to the wall = 4 cm
air inlet
side view
air outlet
d
4.1 Pan material for induction cookers
Cooking with induction àit is very important to use appropriate pan material. The bottom of
the pan is the element that closes the magnetic field generated by the induction coil.
Use only appropriate pan material.
In order to check whether your pan is appropriate, use a magnet. This has to stick at the
bottom of the pan. If not, your pan is not suitable for induction cookers. Choose a pan
suitable for induction.

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5Tests
5.1 Pan detection (Base-Line only)
ATTENTION The heating area is warmed by the hot pan. In order to
avoid injuries (burnings), do not touch the heating area.
This test shows whether the induction cooker is working well when pans with a little
diameter are used and if little metallic objects are heated on the heating area. To do this
test, you need the following material:
•An appropriate pan with a bottom diameter of 12 cm
or two untreated round metallic plates, approximately 4mm thick:
•metallic plate 1 diameter d = 12 cm
•metallic plate 2 diameter d = 7 cm
Test with pans
Step Action Level Result
1Put the pan in the middle of the heating
area 1 ..........12 Heat, the indicator lights
2Push the pan until the edge of the pan is
in the middle of the heating area 1 ..........12 No heating, the indicator doesn’t light
Test with metallic plates
Step Action Level Result
1Put the metallic plate in the middle of the
heating area 1 ..........12 Heat, the indicator lights
2Push the metallic plate until the edge of
the plate is in the middle of the heating
area
1 ..........12 No heating, the indicator
doesn’t light
5.2 Power rating
ATTENTION The heating area is warmed by the hot pan. In order to
avoid injuries (burnings), do not touch the heating area.
This test shows whether the rating may be set by the potentiometer. You need an appropriate pan
(or a Wok-pan for Wok types) with a bottom diameter of >12cm.

Step Action Level Result
1Put the pan on the heating area until
water is boiling 12 Heat, water is boiling
2Reduce the power by turning slowly the
control knob 12 ..........1 Heat rating reduces (water does not boil anymore),
phase current reduces
continuosly
5.3 Maximum rating
ATTENTION The heating area is warmed by the hot pan. In order to avoid
injuries (burning), do not touch the heating area.
For this test you need a pan with a bottom diameter of 28 cm or more, resp. a Wok pan for the
Wok types.
Test cooking time
Step Action Level Result
1Put a pan on the heating area and fill it up
with some litres of water (~20º) 12 heat
2Measure the time until water is cooking
(Type Base-Line) 12 The measured time should be:
140 Sec./litre (3.5kW)
70 Sec./litre (5.0kW)
Measure the time until water is cooking
(Type Wok-Line) 90 Sec /litre (3.5kW) 60 Sec./litre (5.0kW)
5.4 Current
Step Action Level Result
1Put a pan on the heating area and fill it up
with some litres of water (~20º) 12 heat
2Measure phase current 12 Standard value:
1 x 208 VAC
- 3.5 kW 17A
1 x 220/230 VAC
- 3.5 kW 16 A
3 x 208 VAC
-3.5 kW 10 A
-5.0 kW 14 A
3 x 380/400 VAC
- 5 kW 8 A

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5.5 Fan
ATTENTION The heating area is warmed by the hot pan. In order to avoid injuries
(burnings), do not touch the heating area.
With this test, fan, fan observer as well as the degree of soiling are verified. At the beginning of the
test, the induction cooker should be cold. You need a pan with a bottom diameter of >28cm or a
Wok pan.
Step Action Level Result
1Put a pan on the heating area and fill it up
with some litres of water 12 heat
2Measure the time until the fan starts
working 12 The fan should start working after 6-8 minutes
3Go on cooking for about 30 minutes 12 The heating process may not
be interrupted (indicator
lamp) The fan may
repeatedly start and stop.
4Stop the induction cooker 0The fan stops immediately
5.6 Test components
CAUTION The mains cable must be switched off.
5.6.1 Power board
The function of the transistor modul and of the rectifier are verified.
Rectifier (picture 1)
Conducting-state voltage Diode U+= 0,5V: if all conducting-state voltages show approx. 0.5 V, the
rectifier is working.
A short circuit between ‚+‘ and ‚-‚ means that the transistor module is defective.
Transistor module (picture 2)
Conducting-state voltage Diode U+= 0.4 V: if all conducting-state voltages show approx.0.4 V, the
transistor module is working. A short circuit between C2-E2, C1-E1 and C1-2 means that the
transistor module is defective.
If the rectifer and/or the transistor module seem to be defective, separate the power board
C016/C031 from heat sink and verify the rectifier and the transistor module without connection.

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5.6.2. Rectifier
The recitifier is separated from the power board but still fixed on the heat sink. Dismount according
to „Replacement of power board“.
•Conducting-state voltage Diode U+= approx. 0.5 V: if all conducting-state voltages show
approx. 0.5 V, the rectifier works.
•Short circuit at the different diodes: rectifier is defective.
Picture 1
3.1
5.6.3 Transistor module
The transistor module is separated from the power board but still fixed on the heat sink. Dismount
according to „Replacement of power board“.
Conducting-state voltage Diode U+= approx. 0.4 V: if all conducting-state voltages show approx.
0.4V, the transistor module is working.
A short circuit between AC2-E2, C1-E1 and C1-E2 means that the transistor module is defective. If
the module is defective, verify diodes D7, D8, D9 and D10 on short circuit (see 9.2/9.3). Replace
the power board when you discover a short circuit.
Picture 2

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6Maintenance / Service
Maintenance work may only be effected by authorized personnel. Before starting the
maintenance works, the energy supply must be stopped and the appliance must have
cooled down. The following maintenance works must be effected periodically. The longer
and the more frequently the cooker is used, the more often the maintenance works have to
be effected. Every cooker must be checked at least once a year.
Fan
The good function of the cooker can only be guaranteed if the electronic is kept by normal
working temperatures.
•The air inlet and air outlet slots must not be hindered
•The airducts must be free of dirt
•The air must circulate unhinderedly through the heat sink (no hindrance)
•The fan is well fixed
•The heat sinks are well fixed
Induction coil
Check:
•Mechanical fixing (screws tightened)?
•Coil adhesive (fixing o.k.)?
•Ferrite (fixing o.k.)?
Generally
Check
•Protection connection to earth?
•Screwed connections
•Isolations of cables
•Any kind of liquids that have entered the cooker
•Dirt in the cooker
7Fault finding
7.1 Generally
ATTENTION Do not open the cooker as long as it is connected with current.
Dangerous tension!
The induction cooker may only be opened by authorized personnel. Stop any work if the heating
area(vitrocerame) is broken. The induction cooker must be switched off and the mains cable must
be disconnected. Do not touch any parts inside the cooker.
Before replacing a part check the wiring. Make especially attention to the following faults:
•Broken cables
•Squeezed cables
•Defective isolations of cables
•Bad soldering joints
You must not effect any repair on the printed boards. It is important to do respective maintenance
works after every repair (see „Maintenance“, and „Service“)

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7.2 Error messages
LED8 LED7 LED6 LED5 Code Signification
-- -- -- -- -- No mistake, normal function
-- -- -- on 1 No coil current, Hardware overcurrent
-- -- on -- 2High coil current, Software overcurrent
-- -- on on 3 Temperature heat sink
-- on -- -- 4Temperature heating area 1)
-- on -- on 5 Potentiometer line break
-- on on -- 6Temperature inside
-- on on on 7 Heating area coil sensor 2)
on on -- -- 12 Power reduction heat sink temperature 3)
on on -- on 13 Power reduction coil temperature 3)
1) The induction unit can only be startet again if the fault has been given receipt for (turn
power rotary knob „off“)
2) The induction unit continues working but the temperature of the cooking platform is not
controlled anymore.
3) The induction unit continues working with reduced power cycles.
„Code“ informs about the number of flashes of the indicator lamp.
Order of error message: The indicator lamp flashes for an interval of 0,6 sec. The number of the
following short flashes has to be counted and informs about the kind of error corresponding to the
above mentioned code system

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7.3 Flux plot to fault finding

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7.4 Fault finding / Troubleshooting guide
Fault Possible cause Action to take through
authorized personnel Nr.
Fuse burns out at
starting Cooker is wrong connected Check the connections
Short circuit at power print Check the power print AP1
Short circuit wiring Check the wiring
No heating (indicator
lamp does not flash) Potentiometer on „OFF“position Turn the potentiometer on „ON“ (interrupter „ON“)
Main switch defective Check power on binder 5
and 6 (one phase) or 4,5,
and 6 (three phase) on
power board
No current supply Check the fuses,
Check connection
Power supply not satisfactory Check power supply
Fuses „Logic supply“ on power
print defective Check and replace eventually fuses S1 and S2
(Typ 1AT)
No heating Pan too small
(Diameter of pan bottom less
than 12 cm)
Take appropriate pan
Pan is not placed in the middle
of the heating area (pan can not
be detected)
Push the pan in the middle
of the heating area
Inappropriate pan Choose a pan appropriate
for induction 1)
Power print defective Check power print AP2
Logic print defective Check logic print AL1
Potentiometer defective Check potentiometer AO1
Temperature sensor
Coil defective Check temperature coil sensor AT1

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Fault Possible cause Action to take through
authorized personnel Nr.
No heating with small
pans Pan detection wrong adjusted Contact your supplier AL2
Poor heating, indicator
lamp is ON (flashes) Used pan is not ideal Chose a pan that is recommended for induction
cooking. Compare results
with your pan.
Potentiometer defective Check potentiometer AO2
Air cooling system is obstructed Make sure that the air
supply und air exit are not
obstructed
Poor heating Ambient temperature is too high
(the air cooling system cannot
hold the cooker in the normal
operating temperature 2)
Make sure that no hot
ambient air is sucked in by
the fan. Reduce the
temperature of the ambient
air. The temperature of the
air supply may not exceed
40ºC/ 110º F.
One phase is missing (only with
three phase supply) Check the fuses
Power print defective Check power print AP3
Logic print defective Verify logicprint AL3
No reaction on
turning the control
knob
Potentiometer is defective Check potentiometer AO3
Heat rating switches
off and on within
minutes, fan is working
Air cooling system is hindered Make sure that air supply
and air exit are not hindered,
clean air slots
Fan is dirty Clean fan AF1
Heat rating switches
on and off within
minutes, fan does not
work
Fan defective
Fan checking defective Check fan AF2
Heat rating switches
on and off within
minutes (after a long
and constant use)
Coil is overheated, heating area
is too hot
Empty pan
Overheated oil in the pan
Switch off cooker, put pan
away and wait until the
heating area has cooled
down.

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Fault Possible cause Action to take through
authorized personnel Nr.
Small metallic objects
(for ex. spoons) are
heated on the heating
area
Pan detection is wrong adjusted Check logic print and contact
your supplier AL4
1) In order to verify whether the pan is appropriate use a magnet which should stick at the bottom
of the pan. If it does not, your pan is inappropriate to induction cookers. Choose pan material
that is recommended for induction appliances.
2) The cooling system is starting to work when the temperature of the heat sink is higher than
55ºC/160ºF, it reduces the checking of the power in order to hold the power board in normal
working conditions.
7.5 Fault repair
Detailled instruction of the steps in order to repair faults (see list“Faultfinding“)
Nr. Action
AP1 Switch off the mains cable of the cooker. Check with ohmmeter whether a short circuit
has occured. Make this test in „ON“ and „OFF“-position. Locate short circuit. If it
happened to the power print, replace it.
AP2 Check load +24 VDC
ST 1/1: „24 VDC, ST 1/4 ND (on power prints C016, C031 and on logic prints C018)
If wrong, replace logic print.
The following measurements must be done with oscilloscope:
Sign „enable“ (ST 1/2) and „low“ (ST 1/3)ª. If wrong, replace logic print C018, Check
components (see „Test components“)
AP3 Sign „low“ (ST 1/3) and high0“ (ST 1/5)ª If wrong, replace logic print C018, otherwise
check components on the power print (see „Test components“).
AL1 Verify signs „enable“ (ST 1/2) and „low“ (ST 1/3)ª . If wrong, replace logic print C018.
AL2 Replace logic print
AL3 Check signs „low“ (ST 1/3) and „high0“ (ST 1/5)ª. If wrong, replace logic print C018
otherwise replace power unit (s. AP3)
AL4 See AL2