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Service Manual for Speed Oven Model DSO 500

TABLE OF CONTENTS

SAFETY PRECAUTIONS ....................................................................................................................3
INTRODUCTION .................................................................................................................................6

MAIN FEATURES ..........................................................................................................................7

INSTALLATION ...................................................................................................................................8

UNPACKING OVEN ......................................................................................................................8

RADIO INTERFERENCE ..............................................................................................................8

OVEN PLACEMENT......................................................................................................................8

ELECTRICAL INFORMATION .......................................................................................................8

EARTHING INSTRUCTIONS ........................................................................................................9

EXTERNAL EQUIPOTENTIAL ......................................................................................................9

SPECIFICATIONS .............................................................................................................................10

INPUT POWER ...........................................................................................................................10

OUTPUT POWER .......................................................................................................................10

DIMENSIONS ..............................................................................................................................10

WEIGHT ......................................................................................................................................10

RECOMMENDED CLEARANCES ..............................................................................................10

INTERNAL COOKING CAVITY DIMENSIONS............................................................................10

PREVENTIVE MAINTENANCE .........................................................................................................11

CLEANING ..................................................................................................................................11

SERVICING PROCEDURES ............................................................................................................12

GENERAL ....................................................................................................................................12

COMPONENT OVERVIEW ...............................................................................................................13

STIRRER MOTOR AND GEARBOX ...........................................................................................13

HIGH VOLTAGE TRANSFORMERS ...........................................................................................15

HIGH VOLTAGE RECTIFIERS ....................................................................................................17

HIGH VOLTAGE CAPACITORS ..................................................................................................19

MAGNETRONS ...........................................................................................................................21

MAGNETRON THERMAL SWITCHES .......................................................................................23

SOLID STATE RELAYS ...............................................................................................................25

MECHANICAL RELAYS AND INTERLOCK SWITCHES ............................................................27

HEATERS AND THERMAL CUTOUTS .......................................................................................29

LINE FUSES ................................................................................................................................31

JET PLATES ................................................................................................................................33

CABINET COOLING FANS .........................................................................................................35

Summary of Contents for DSO 500

Page 1: ...1 Duke Manufacturing Company All rights reserved Reproduction without written permission is prohibited Duke is a registered trademark of the Duke Manufacturing Company Duke Manufacturing Company 2305 N Broadway St Louis MO 63102 Phone 314 231 1130 Toll Free 1 800 735 3853 Fax 314 231 5074 www dukemfg com SPEED OVEN MODEL DSO 500 P N 168465B ...

Page 2: ...Service Manual for Speed Oven Model DSO 500 2 ...

Page 3: ... for any service test or inspection within the microwave generating compartments check the magnetron wave guide or transmission line and cavity for proper alignment integrity and connections d Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this manual befo...

Page 4: ...UT POWER 10 DIMENSIONS 10 WEIGHT 10 RECOMMENDED CLEARANCES 10 INTERNAL COOKING CAVITY DIMENSIONS 10 PREVENTIVE MAINTENANCE 11 CLEANING 11 SERVICING PROCEDURES 12 GENERAL 12 COMPONENT OVERVIEW 13 STIRRER MOTOR AND GEARBOX 13 HIGH VOLTAGE TRANSFORMERS 15 HIGH VOLTAGE RECTIFIERS 17 HIGH VOLTAGE CAPACITORS 19 MAGNETRONS 21 MAGNETRON THERMAL SWITCHES 23 SOLID STATE RELAYS 25 MECHANICAL RELAYS AND INTER...

Page 5: ... REPAIR PROCEDURES 53 RELAY AND SWITCH REPLACEMENT 53 LINE FUSE REPLACEMENT 54 INVERTER REPLACEMENT 55 BLOWER MOTOR REPLACEMENT 56 ELECTRICAL PANEL REPLACEMENT 58 MAGNETRON REPLACEMENT 59 STIRRER MOTOR REPLACEMENT 60 HEATER ELEMENT REPLACEMENT 61 CABINET THERMAL SWITCH REPLACEMENT 62 HIGH VOLTAGE TRANSFORMER REPLACEMENT 63 FRONT THERMAL COOLING FAN REPLACEMENT 64 INTAKE AND EXHAUST FANS REPLACEMEN...

Page 6: ...Service Manual for Speed Oven Model DSO 500 6 INTRODUCTION Figure 1 10 1 2 6 3 4 5 12 10 7 8 9 11 4 ...

Page 7: ... be kept clean and free of debris See CARE and CLEANING instructions in the OPERATOR S MANUAL 6 DOOR AND HEAT SHIELD The door is pulled downwards and towards you to open The door is designed with interlocks for microwave safety The door should NOT be used to support heavy dishes It must be kept clean The door includes a heat shield attached to the front See CARE and CLEANING instructions in the OP...

Page 8: ...place warning label in a conspicuous place close to microwave oven Outlet should be located so that plug is accessible when oven is in place Provide clearance as shown in Figure 2 and described in the following paragraphs A and B A Allow at least 3 7 62 cm of clearance around the sides of oven Proper airflow around the oven cools electrical compo nents With restricted airflow the oven may not oper...

Page 9: ...s too short have a qualified electrician install a three slot receptacle This oven should be plugged into a separate circuit with the electrical rating as provided in product specifications available on Duke s Wavelink website EXTERNAL EQUIPOTENTIAL Earthing Terminal export only Equipment has secondary earthing terminal Terminal provides external earthing connec tion used in addition to earthing p...

Page 10: ...ve 1600 Watts Heaters 5400 Watts DIMENSIONS Height 26 in with 4 in legs Width 25 7 8 in Depth 31 in incl door handle WEIGHT Unpacked Approximately 250 lbs Packed 360 lbs RECOMMENDED CLEARANCES Height None required Width 3 inches on each side Depth None required INTERNAL COOKING CAVITY DIMENSIONS Height 8 in Width 16 in Depth 14 1 2 in SPECIFICATIONS Table 2 lists the specifications for the Model D...

Page 11: ...mmonly found in hard water salts and household and industrial cleaners If cleaners containing chlo rides are used be sure to rinse repeatedly and dry thoroughly upon completion Routine cleaning of stainless steel can be done with soap and water Extreme stains or grease should be cleaned with a non abrasive cleaner and plastic scrub pad It is always good to rub with the grain of the steel There are...

Page 12: ... in the oven operation Location and Access information Safety Issues Tools Required Operational Testing Test Procedure Replacement Procedure NOTE Remember this overview is only intended to provide a brief discussion on each com ponent Details for testing adjusting and replacement are provided separately in the TESTING and REPAIR section of this manual and should be referred to when performing any ...

Page 13: ...hich becomes live when power cord is live Proximity to High Voltage system 5 kVDC which can remain live even after power down Upper end of motor shaft rotates rapidly with small exposed cooling fan Tools required Flat blade screwdriver to remove top and side panels 11 32 inch nut driver to remove nuts se curing motor and gearbox to top of oven Voltmeter Flash light Operational testing The stirrer ...

Page 14: ...wer is present at all times the door interlock safety system has failed Check the mechanical relays K6 K8 and primary and secondary door switches Replacement After removing the side and top panels and disconnecting the power cord the stirrer motor power leads can be disconnected There are four 11 32 inch nuts securing the stirrer motor and gearbox Upon refitting align the dnveshaft of the gearbox ...

Page 15: ...itch is in ON position and oven doors are closed Tools Required Flat blade screwdriver to remove top and side panels 3 8 inch nut driver to remove nuts secur ing transformers to top of oven Voltmeter Operational Testing The transformers are powered from the 208 240 VAC mains supply through solid state relays K4 and K5 and mechanical relay K6 and K8 Re lays K6 and K8 are controlled by the door safe...

Page 16: ...oming line volt age line fuses mechanical relays K6 K8 and primary and secondary door switches If power is present at all times the door interlock safety system has failed Check the mechanical relays K6 K8 and primary and secondary door switches and POWER ON OFF switch Replacement WARNING THE HIGH VOLTAGE CAPACITOR RETAINS THE 2 5 kVDC CHARGE EVEN AFTER THE OVEN IS DISCONNECTED THIS CAPACI TOR MUS...

Page 17: ... Tools Required Flat blade screwdriver to remove top and side panels Phillips 2 screwdriver to remove screws securing diodes to top of oven Ohmmeter to check diodes Operational Testing The transformers connected to the diodes are powered from the 208 240 VAC mains sup ply through solid state relays K4 and K5 and mechanical relay K6 and K8 Relays K6 and K8 are controlled by the door safety interloc...

Page 18: ...wires to the diodes Use an ohm meter to check diodes Diodes should conduct in one direction showing low resistance and not conduct in the reverse direction thus indicating a very high resistance High or low resistance in both directions indicates a defective diode Replacement WARNING HIGH VOLTAGE CAPACITOR MUST BE DISCHARGED BEFORE SERVICING THE TRANSFORMERS After removing the side and top panels ...

Page 19: ...ools Required Flat blade screwdriver to remove top and side panels 5 16 inch nut driver to remove nuts secur ing diodes to top of oven Ohmmeter to check capacitors Operational Testing The capacitors charge whenever the transformer is operating The transformers connected to the diodes for charging the capacitors are powered from the 208 240 VAC mains supply through solid state relays K4 and K5 and ...

Page 20: ...NG SECTION BEFORE TESTING NOTE Dangerous voltages can be present at this component Refer to detailed test procedure for testing this component Replacement WARNING HIGH VOLTAGE CAPACITOR MUST BE DISCHARGED BEFORE REPLACEMENT Capacitor must be discharged before removal After discharging disconnect leads There are two nuts securing the capacitor bracket HIGH VOLTAGE CAPACITORS NOTES ...

Page 21: ... operating The 4 5 VAC magnetron filament supply is at 2500 V relative to the chassis Tools required Flat blade screwdriver to remove top and side panels 3 8 inch nut driver to remove nuts secur ing the magnetrons to top of oven Operational Testing The magnetrons receive filament and high volt age from the high voltage transformers The transformers connected to the diodes for charg ing the capacit...

Page 22: ...WARNING HIGH VOLTAGE CAPACITOR MUST BE DISCHARGED BEFORE MAGNETRON REPLACEMENT Remove cooling duct Right side magnetron only Label and disconnect wires from trans former to magnetron filament Disconnect wires to thermostat Remove nuts attaching magnetron to top surface When installing the new mag netron be sure metal mesh gasket is properly positioned around the magnetron dipole antenna and that t...

Page 23: ...GED BEFORE WORKING ON ANY COMPONENTS IN THE HIGH VOLTAGE AREA Electrical supply of 208 240 VAC to trans formers when POWER switch is in ON position and oven doors are closed Capacitors charge to the 2 5 kVDC level when the high voltage circuit is properly operating Tools required Flat blade screwdriver to remove top and side panels 3 8 inch nut driver to remove nuts secur ing the magnetrons to top...

Page 24: ...ng this component NOTE Disconnect wires to thermostat and check continuity across thermostat terminals Continuity should be indicated when thermostat is at normal ambient tempera ture Replacement WARNING HIGH VOLTAGE CAPACITOR MUST BE DISCHARGED BEFORE MAGNETRON THERMOSTAT REPLACEMENT Label and disconnect wires to thermostat Re move screw securing thermostat to magnetron and remove thermostat When...

Page 25: ...e control board Control board operation requires the oven door to be closed Each solid state relay has a LED indicator that illuminates when the relay is operated Each heater is controlled separately by either relay K1 K2 or K3 When the magnetrons are to be operated relays K4 and or K5 will have the LED illuminated Test Procedure Disconnect output leads from the relay to be checked Set program to ...

Page 26: ...Service Manual for Speed Oven Model DSO 500 26 SOLID STATE RELAYS NOTES ...

Page 27: ... attaching screws 2 Phillips screwdriver Operational Testing The mechanical relays are controlled by the three oven door switches P primary M Monitor and S Secondary When the oven door is closed switches P and S should be closed energizing relays K6 and K8 At this time switch M should be open de energizing relay K7 When relay K6 and K8 are closed operating voltage is applied to the high voltage ma...

Page 28: ...Service Manual for Speed Oven Model DSO 500 28 MECHANICAL RELAYS AND INTERLOCK SWITCHES NOTES ...

Page 29: ...ion and Access The heaters and thermal cutouts are located inside a housing at the right rear of the oven The right side panel top panel and rear panel will need to be removed Safety Issues WARNING THE HIGH VOLTAGE CAPACITOR RETAINS THE 2 5 kVDC CHARGE EVEN AFTER THE OVEN IS DISCONNECTED THIS CAPACI TOR MUST BE DISCHARGED BEFORE WORKING ON ANY COMPONENTS WHEN THE TOP COVER IS REMOVED Electrical su...

Page 30: ...ated for the heater element to be turned on When testing the heater elements the temperature in the oven must be less than 274 C so that the thermostats remain closed Test Procedure Close oven door Check for operating voltage across heater terminals Unplug oven and check continuity across heater coils If a heater coil shows high resistance coil is probably open Replacement Refer to detailed proced...

Page 31: ...ER switch is in ON position Main POWER switch and fuses have 208 240 VAC present on the input side whenever the oven is connected to the input power source Tools required Flat blade screwdriver to remove panels and remove fuses from fuse clips Operational Testing The line fuses must be operational for the heat ing elements magnetron circuit and stirrer motor to function If any of these components ...

Page 32: ...Service Manual for Speed Oven Model DSO 500 32 LINE FUSES NOTES ...

Page 33: ...08 240 VAC to the control transformer when POWER switch is in ON position Main POWER switch and fuses have 208 240 VAC present on the input side whenever the oven is connected to the input power source Tools required Upper Jet Plate Allen wrench 5 32 inch Lower Jet Plate Flat blade screwdriver or flat knife Replacement Upper Jet Plate 1 Remove front two Allen head screws from white circular clamps...

Page 34: ...Service Manual for Speed Oven Model DSO 500 34 JET PLATES NOTES ...

Page 35: ...POWER switch and fuses have 208 240 VAC present on the input side whenever the oven is connected to the input power source Tools required Flat blade screwdriver to remove panels and remove fans and fan guards Operational Testing The fans are operational whenever the POWER switch is in the ON position and any time the cool ing thermostat sees a temperature greater than 40 C When the POWER switch is...

Page 36: ...Service Manual for Speed Oven Model DSO 500 36 CABINET COOLING FANS NOTES ...

Page 37: ... CAPACITOR MUST BE DISCHARGED BEFORE WORK ING ON ANY COMPONENTS IN THE HIGH VOLTAGE AREA Electrical supply of 208 240 VAC to the control transformer when POWER switch is in ON position Main POWER switch and fuses have 208 240 VAC present on the input side whenever the oven is connected to the input power source Tools required Flat blade screwdriver to remove top panel of oven 3 8 inch nut driver t...

Page 38: ...R switch and allow cabinet to cool down If magnetron cooling fan does not stop operating thermal switch may be faulty MAGNETRON COOLING FANS NOTES Replacement Unplug oven from power source Remove top cover Disconnect wires to the defective fan Re move nuts then remove fan Install new fan being sure rubber isolated are on the four mounting holes and attach with the four nuts Reconnect wires Install...

Page 39: ...illips screwdriver to remove screws securing thermal switch to top side of oven Operational Testing The thermostat closes when a temperature great er than 40 C is present in the cabinet When the POWER switch is turned OFF the cabinet should cool down and the thermal switch open when the temperature drops below 40o C If fans do not stop operating thermal switch is probably faulty Test Procedure Tur...

Page 40: ...Service Manual for Speed Oven Model DSO 500 40 COOLING FAN THERMAL SWITCH NOTES ...

Page 41: ...is in ON position Main POWER switch and fuses have 208 240 VAC present on the input side whenever the oven is connected to the input power source Tools required Flat blade screwdriver to remove side panel 5 16 inch nut driver to remove nuts se curing keypad control board to front of oven Operational Testing The keypad control board controls all func tions of the oven and provides status and error ...

Page 42: ...Service Manual for Speed Oven Model DSO 500 42 KEYPAD CONTROL BOARD NOTES ...

Page 43: ...ls required Flat blade screwdriver to remove side panel 2 Phillips screwdriver to remove screws securing inverters to right side of oven Operational Testing The inverters drive the upper and lower convec tion fans Operation of the inverters is controlled by the control board through wires 71 80 Wires 71 through 75 control the upper blower and wires 76 through 80 control the lower blower Test Proce...

Page 44: ...Service Manual for Speed Oven Model DSO 500 44 INVERTERS NOTES ...

Page 45: ...er should be within the following range Temperature Rise 70ºF 21ºC Minimum 75ºF 24ºC Maximum 6 The actual power output in Watts can be cal culated by multiplying the water temperature in Celsius by 70 Temperature Rise C Power W 20 1400 21 1470 22 1540 23 1600 24 1680 MICROWAVE LEAKAGE TEST This requirement must be strictly observed In addition the leakage reading must be recorded on the service re...

Page 46: ...oven and point of measurement Measuring Procedure 1 Move the meter probe at 1 sec over all door oven gaps 2 Place 275ml of cold water in the 600ml glass beaker 3 Place the 600ml glass beaker in the center of oven NOTE Water must be changed every 30 seconds to prevent boiling If water boils the results may be inaccurate 4 Close the door and set time for 30 seconds then press Power pad 100 5 Move th...

Page 47: ...D M M Insulation Resistance Tester Procedure 1 Isolate the oven from the power source COMPONENT TESTING WARNING HIGH VOLTAGE CAPACITOR MUST BE DISCHARGED BEFORE PERFORMING THIS PROCEDURE WAIT AT LEAST FIVE 5 MINUTES AFTER SHUTDOWN OF HIGH VOLTAGE SYSTEM 2 Discharge the high voltage capacitor as described in the paragraph DISCHARGING THE HIGH VOLTAGE SYSTEM ON THE DUKE SPEED OVEN 3 Remove all conne...

Page 48: ...ote that due to the high voltage it is possible to receive an electric shock when touching a nonmetal part such as an insulated connector or even an insulated cable Tools Required Approximately 12 inches of high voltage insulated cable of the type used for the high voltage wiring The conductor should be bared at each end to a length of 0 5 inch This cable is used to discharge both high voltage cap...

Page 49: ...HE FRONT OF THIS MANUAL Tools required Digital Multimeter Megohmmeter Test Procedure 1 Disconnect the oven from the power source 2 Remove top cover and right side panel to access the high voltage capacitor WARNING HIGH VOLTAGE CAPACITOR MUST BE DISCHARGED BEFORE PERFORMING THIS PROCEDURE WAIT AT LEAST FIVE 5 MINUTES AFTER SHUTDOWN OF HIGH VOLTAGE SYSTEM 3 Discharge the high voltage capacitor as de...

Page 50: ...hmmeter Test Procedure 1 Disconnect the oven from the power source 2 Remove top cover and right side panel to access the high voltage diodes rectifiers WARNING HIGH VOLTAGE CAPACITOR MUST BE DISCHARGED BEFORE PERFORMING THIS PROCEDURE WAIT AT LEAST FIVE 5 MINUTES AFTER SHUTDOWN OF HIGH VOLTAGE SYSTEM 3 Discharge the high voltage capacitor as described in the paragraph DISCHARGING THE HIGH VOLTAGE ...

Page 51: ...th no output contact closure If no output contact closure is detected at relay K7 check for presence of coil voltage If coil voltage is not present check for proper activation of door switch M monitor Figure 19 5 With the oven door in the closed position check for output contact closure at relays K6 and K8 Check that relay K7 is inactive with no output contact closure If no output contact closure ...

Page 52: ...Service Manual for Speed Oven Model DSO 500 52 COMPONENT TESTING NOTES ...

Page 53: ...he wire labeling and reconnect the wires to the relay 7 Reinstall the left side panel Switch Replacement Procedure 1 Disconnect the oven from the power source 2 Remove the right side of the oven to access the primary or monitor switches or remove the left side of the oven to access the second ary or control switches 3 Disconnect and label the wires attached to the switch to be replaced 4 Remove th...

Page 54: ... the power cord is plugged into a live socket Remove power cord from wall socket before attempting to change or test the fuses Replacement Procedure WARNING THE FUSE HOLDER WILL REMAIN ALIVE UNLESS THE OVEN IS DISCONNECTED FROM THE POWER SOURCE 1 Disconnect the oven from the power source 2 Remove the right side panel to access the fuses 3 Carefully remove the fuse s from the fuse block 4 Install t...

Page 55: ...ttached to the terminals on the bottom of the inverter 4 Remove the nuts securing the inverter to the back panel and remove the inverter NOTE New inverters must be programmed after installation 5 Be sure replacement inverter is oriented properly then attach inverter to the back panel with the nuts 6 Observe the wire labeling and reconnect the wires to the terminals on the bottom of the inverter 7 ...

Page 56: ... The upper and lower Blower Motors are located directly behind the oven rear panel and are accessed through the oven left side panel The squirrel cage fan is attached to the motor shaft and can be removed as a complete unit Replacement Procedure TO BE PROVIDED Figure 24 Figure 25 ...

Page 57: ...57 REPAIR PROCEDURES ...

Page 58: ...t and isolate the oven from the power source 2 Remove the right side panel to gain access to the electrical panel 3 Disconnect connectors J1 J2 J3 and J4 Figure 27 from the circuit board NOTE Theuseofawristgroundingstrapis advised to reduce the risk of circuit board damage from static electricity 4 Remove the control panel mounting screws located in the approximate corners of the control panel 5 C...

Page 59: ...S AFTER SHUTDOWN OF HIGH VOLTAGE SYSTEM 3 Discharge the high voltage capacitor as described in the paragraph DISCHARGING THE HIGH VOLTAGE SYSTEM ON THE DUKE SPEED OVEN 4 Remove cooling duct Right side magnetron only 5 Unplug spade connectors from the terminal housing 6 Remove magnetron mounting nuts and remove magnetron CAUTION When installing the new magne tron be sure metal mesh gasket is proper...

Page 60: ... THE OVEN DISCONNECTED 2 Remove the oven top panel to gain access to the stirrer motor 3 Unplug and label the spade connectors from the terminals 4 Open oven door and remove top jet plate to access stirrer 6 Remove mounting screws and remove stirrer motor unit 7 Orient and install the replacement stirrer motor unit rotating the stirrer blade until the drive head of the stirrer motor unit engages w...

Page 61: ... to heaters using a pair of thin 3 8 inch open ended wrenches 8 Remove nine Philips head screws securing the heater insulation outer panel and remove panel 9 Remove thermal insulation material and secure against loss or damage 10 Remove ten Phillips head screws securing heater assembly to oven NOTE Take care when removing these screws After extended service some of these may bind If resistance is ...

Page 62: ...cooling fans will function independent of the MASTER ON OFF switch setting Figure 31 Cabinet Thermal Switch Replacement Procedure 1 Disconnect and isolate the oven from the power source 2 Remove the oven top panel to gain access to the thermal switch 3 Unplug and label the spade connectors from the thermal switch 4 Remove thermal switch mounting screws and remove thermal switch 5 Orient and instal...

Page 63: ...capacitors WARNING THE HIGH VOLTAGE CAPACITORS MUST BE DISCHARGED BEFORE PERFORMING ANY WORK ASSOCIATED WITH THE TRANS FORMER CIRCUITRY WAIT AT LEAST FIVE 5 MINUTES AFTER SHUTDOWN OF HIGH VOLTAGE SYSTEM 3 Discharge the high voltage capacitor as described in the paragraph DISCHARGING THE HIGH VOLTAGE SYSTEM ON THE DUKE SPEED OVEN 4 Unplug and label all spade connectors from the transformer 5 Note o...

Page 64: ...s the magnetrons high voltage transformers and door switches Figure 33 Front Thermal Cooling Fan Replacement Procedure 1 Disconnect and isolate the oven from the power source 2 Remove the oven top panel to gain access to the thermal cooling fan motor and squirrel cage fans 3 Remove all metal ducting and shrouds 4 Disconnect and label all wiring to the thermal cooling fan motor 5 Remove motor mount...

Page 65: ... the power source NOTE The three fans are attached to the back panel When removing back panel take care not to break any wires attached to the fans 2 Remove the oven rear panel to gain access to the fans 3 Disconnect wires from the fan to be serviced 4 Remove the attaching hardware then remove the fan and the grill 5 When installing a new fan be sure to also in stall the grill on the outside of th...

Page 66: ...ch Procedure 1 Disconnect the oven from the power source 2 Remove oven left and right side panels to gain access to the interlock switch assembly Switches are located at the top corners at the point where oven door latches engage 3 Locate the adjustment bolt 4 Loosen the locking nut and adjust the switch plate to mechanically engage the primary interlock switch P and the secondary in terlock switc...

Page 67: ...t wall receptacle Check main fuse block Insure that oven door is fully closed and latched Check for interference Check door seal Inspect door latch switches 4 to insure that the switches are mechanically actuating when door is closed and adjust if necessary Insure L1 output from switch P and S and no output from switch M with door in closed position At the electronic control board check for closed...

Page 68: ...ltage is present replace magnetron Check for 12 VAC supply voltage to solid state relays K1 K2 and K3 If present check for L2 voltage at terminal L1 If L2 voltage is present check for L2 out put at terminal T1 If no output voltage is present replace defective solid state relay Isolate and check the high limit thermo stat If circuit is open while oven is in off state replace the thermostat Isolate ...

Page 69: ...heck for incoming control signals at terminals 3 5 8 9 and 10 If control signals are not present trace and check wiring back to the electronic control board Check for control output signals at ter minals 1 thru 10 of the upper and lower blower units If no signals are present replace the electronic control board If output voltage is present at inverter terminals T1 T2 and T3 insure that same voltag...

Page 70: ...ing thermostat circuit is closed when oven temperature is above 40 C If circuit is open replace the cool ing thermostat Check for 208 220 240 VAC supply volt age to the motor electrical connections If voltage is present at motor with no operation replace motor Check for 208 220 240 VAC supply voltage to the motor electrical connec tions If no voltage is present trace the wiring back through the ma...

Page 71: ...71 Figure 11 Schematic Diagram SCHEMATICS ...

Page 72: ...Rear Muffin Fan 167548 Magnetron Twin Cooling Fan 167601 Cabinet Cool Down Thermostat 40 C 167654 Control Panel Complete 168033 Solid State Relay SSR 167508 Mechanical Relay 167509 Monitor Computer Door Switch no Actuator 168086 Primary Secondary Door Switch with Actuator 168013 Door Switch Insulator 167951 RTD Probe 167610 12 VAC Transformer 155749 Heater 1000 W 167586 Heater 1700 W 167964 O Left...

Page 73: ...eters to be set by pressing the arrow up or ar row down keys Access parameter value by pressing yellow carriage return key The parameter can now be edited Change parameter value with the arrow up or arrow down keys Confirm setting with carriage return key Repeat as need until all required parameters have been adjusted NOTE When accessing parameters n36 to n39 parameter n39 has to be changed first ...

Page 74: ...motor Lowest operating speed of motor Lowest operating supply voltage of motor Parameter to access ac cess prohibition of param eters to be edited Operation mode selection Frequency reference selection Interruption mode selection Reverse rotation enabled prohibit Stop reset function key selection Frequency selection in local mode Key sequential frequency setting Maximum frequency Maximum voltage M...

Page 75: ...nce for motor Multi step speed reference for motor Multi step speed reference for motor Multi step speed reference for motor Acceleration time 1 Acceleration time 1 Acceleration time 2 Acceleration time 2 S shape acceleration de celeration characteristics Frequency reference 1 Frequency reference 2 Frequency reference 3 Frequency reference 4 Frequency reference 5 Frequency reference 6 Frequency re...

Page 76: ...alog input in percentage of maximum input frequency Frequency of minimum analog input in percentage input frequency Frequency inching com mand Frequency reference up per limit Frequency reference lower limit Rated motor current Motor Protection characteristics Motor protective time setting Cooling fan operating settings Multi function input 1 set ting S2 Multi function input 2 set ting S3 Multi fu...

Page 77: ...braking current on induction motors for braking control in percent of rated current Defines braking time Defines deceleration time at startup Stall prevention during Analog frequency reference time Analog monitor output Analog output monitor gain Carrier frequency selection Momentary power inter ruption compensation Fault retry Jump frequency 1 Jump frequency 2 Jump width DC control current Interr...

Page 78: ...ency not stored Sets gain of torque compensation function Set slip value of motor Set current for motor running without load in percent of rated motor current Set slip compensation gain Set time to compensate for mo tor slip Stall prevention level dur ing acceleration Stall prevention during operation Frequency detection level Overtorque detection function selection Overtorque detection level Over...

Page 79: ...t to be changed under normal programming Not to be changed under normal programming Displays latest error code Displays software number OMRON reference not to be adjusted monitor only OMRON reference OMRON reference OMRON reference OMRON reference OMRON reference OMRON reference OMRON reference Low speed carrier frequency reduction se lection OMRON reference OMRON reference Error log Software numb...

Page 80: ...Duke Manufacturing Company 2305 N Broadway St Louis MO 63102 Phone 314 231 1130 Toll Free 1 800 735 3853 Fax 314 231 5074 www dukemfg com ...

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