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MT3255 AND MT3270 SERIES

CONVEYOR OVEN

SERVICE AND REPAIR MANUAL

BLODGETT OVEN COMPANY

www.blodgettcorp.com

50 Lakeside Avenue, Box 586, Burlington, Vermont 05402 USA Telephone (800) 331-5842, (802) 860-3700 Fax: (802)864-0183

PN M8561 Rev B (6/01)

Duplication of the information in this manual is prohibited without the consent of the Blodgett Service Department.

Содержание MT3255 Series

Страница 1: ...p com 50 Lakeside Avenue Box 586 Burlington Vermont 05402 USA Telephone 800 331 5842 802 860 3700 Fax 802 864 0183 PN M8561 Rev B 6 01 E 1999 G S Blodgett Corporation All rights reserved Duplication o...

Страница 2: ...DC Drive System 3 2 Athena Temperature Controller with Open Loop DC Drive System 3 3 Athena Temperature Controller with Closed Loop DC Drive System 3 4 Computer Controller 3 5 Sequence of Operation 3...

Страница 3: ...peed Calibration 4 12 Motor Control Board Adjustment 4 13 Rerating the Appliance 4 15 Checking the Firing Rate 4 16 5 TROUBLESHOOTING DC Drive System 5 1 Convection System 5 3 Heating System 5 4 Compu...

Страница 4: ...INTRODUCTION CHAPTER 1...

Страница 5: ...1 208 240VAC 4 wire service consisting of L1 L2 neutral and ground See FIGURE 1 Use 90_C wire and size to National Electric or local codes Installations outside the U S The MT3255G and MT3270 require...

Страница 6: ...See FIGURE 2 Use 90_C wire and size according to local codes NOTE The burner control unit is phase sensitive If the phase and neutral are switched the control locks out Connect exhaust fan connector 1...

Страница 7: ...as company to ensure that your me ter will provide the proper supply Installations within the U S 1 Add the total BTU s hr of all the gas appliances 2 Convert BTU s to cubic ft hr using the formula Cu...

Страница 8: ...icro Drive nM0984 Pick Up PV 2 for M3393 M5770 Conversion Kit Digital Time Open Loop to Micro Drive Closed Loop nM3127 Motor Conv Drive Bodine 90V Before 9 90 nM2378 Motor Conv Drive Bodine 130V After...

Страница 9: ...re For 9 Pin M3353 Harness Relay Board Open Loop For 25 Pin Before 9 15 95 M7237 Harness Relay Board Closed Loop For 25 Pin After 9 15 95 M3314 Bracket Computer Wall M5661 Bracket Assy Cable Clamp nM0...

Страница 10: ...e Fan 4 Qty 3 nM0572 Cord Axial Fan 30 Power nM0152 Selector Switch Heat Convey or nM0153 Selector Switch Blower nM0151 Knob Selector Switch Heat Conveyor or Blower M1694 Cord Set Plug Assy 10 Foot M0...

Страница 11: ...um 1 4 M0959 Fitting Compression 1 4 M2799 Union Compression 21225 Fitting Elbow M0279 Union 1 2 Inch Black 1949 Nipple Pipe 1 2 x 1 3 16 Close M0317 Elbow 1 2 Inch Street 90 Deg 597 Ell Black 90 Degr...

Страница 12: ...20 M4222 Extension Assy Product 30 M4609 15 Product Extension Crumb Pan Idle M4608 15 Product Extension Crumb Pan Drive M4611 20 Product Extension Crumb Pan Idle M4610 20 Product Extension Crumb Pan D...

Страница 13: ...2386 Blower Motor Combustion M2630 Fuse Line Armature Bodine Board 5 AMP 250V M3155 Digital Temperature Controller C_ M7880 Computer Control Kit Closed Loop SB CE M7333 Pilot Burner Ignitor Assy LP CE...

Страница 14: ...INTRODUCTION 1 10 MT3255E GENERAL EXPORT CONTROL BOX Control Plate not shown...

Страница 15: ...MT3255 and MT3270 1 11 MT3255G AND MT3270 DOMESTIC GENERAL EXPORT CONTROL BOX Control Plate and or Gas Burner Components not Shown...

Страница 16: ...INTRODUCTION 1 12 MT3255 AND MT3270 CE CONTROL BOX Control Plate and or Gas Burner Components not Shown...

Страница 17: ...MT3255 and MT3270 1 13 MT3255 AND MT3270 DOMESTIC GAS BURNER COM PONENTS Control Box not Shown...

Страница 18: ...INTRODUCTION 1 14 MT3255 AND MT3270 CE GAS BURNER COMPONENTS Control Box not Shown...

Страница 19: ...MT3255 and MT3270 1 15 MT3255 AND MT3270 DOMESTIC GENERAL EXPORT SB CONTROL PLATE ASSY...

Страница 20: ...INTRODUCTION 1 16 MT3255 AND MT3270 CE SB CONTROL PLATE ASSY...

Страница 21: ...MT3255 and MT3270 1 17 MT3255 AND MT3270 EXTERIOR OVEN VIEW...

Страница 22: ...ASSEMBLY CHAPTER 2...

Страница 23: ...to the oven 2 Fasten the 1 4 20 hex head screw from the control box into the belt support 3 Older Oven Models install the washer be tween the control box and the tracks Later Oven Models use a formed...

Страница 24: ...power source and in terchange the black and white motor leads at the D C Controller Board located within the control box If the polarity of the motor is changed to right to left belt travel the conve...

Страница 25: ...1 4 20 hex head screws and dimples washers on older models between the con veyor motor and the control box NOTE Twin belt models have a double sprocket chain and motor END PLUGS 1 Install the upper a...

Страница 26: ...OPERATION CHAPTER 3...

Страница 27: ...econds a spark ignites the burner Initial start may require longerdue toair in the gas line NOTE If the oven fails to ignite after the thirty 30 second purge turn the HEAT SWITCH 5 to OFF and wait 5 m...

Страница 28: ...ely thirty 30 seconds a spark ignites the burner Initial start may require longerdue toair in the gas line NOTE If the oven fails to ignite after the thirty 30 second purge turn the HEAT SWITCH 5 to O...

Страница 29: ...ss the UP or DOWN ARROW keys 7 to en ter the desired cook temperature 4 Turn the HEAT SWITCH 8 to ON NOTE If the oven fails to ignite after the thirty 30 second purge turn the blower switch OFF and wa...

Страница 30: ...e OPEN posi tion This is only necessary on initial start up 2 Turn the BLOWER SWITCH 9 to ON 3 Press the UP or DOWN ARROW keys 7 to en ter the desired cook temperature 4 Turn the HEAT SWITCH 8 to ON N...

Страница 31: ...itch Should you need to stop the belt fans or heat press the emergency switch Do not use the emergency switch as a GENERAL on off switch CONTROL OPERATION To turn the oven on 1 Press and hold the ON O...

Страница 32: ...h WAIT D LOW D SET D TIME until the programmed bake temperature is reached The HEAT lamp 9 will remain lit until the oven reaches the temperature set point 4 The display reads READY and the HEAT lamp...

Страница 33: ...tor contactors 4 and ter minal 7 of the hi lo limit board 7 Terminal 7 is an output It remains powered after the oven is shut down to keep the convection fans 5 operating until the unit reaches 135 17...

Страница 34: ...between common and N C terminals sending power to the cooling fans NOTE The switch is located on the ceiling of the convection fan compartment 6 The conveyor is driven by an open loop D C control sys...

Страница 35: ...o keep the convection fans 5 operating until the unit reaches 135 170_F 57 77_C as sensed by the thermocouples 6 NOTE Two thermocouples are located be tween the middle convection fans in the rear of t...

Страница 36: ...ing fans NOTE The switch is located on the ceiling of the convection fan compartment 6 The conveyor is driven by an open loop D C control system consisting of a conveyor switch 23 time display 26 pote...

Страница 37: ...7 77_C as sensed by the ther mocouples 4 NOTE Two thermocouples are located be tween the middle convection fans in the rear of the oven Onethermocouple provides DC millivolts to the Hi Lo limit board...

Страница 38: ...ce ex ceeds the rating on the back of the switch NOTE The switch is located on the ceiling of the convection fan compartment 6 The conveyor is driven by an open loop D C control system consisting of a...

Страница 39: ...h lim it switch is a bulb and capillary style switch It reacts when the oven cavity temperature ex ceeds the high limit programmed into the cooking computer If the high limit switch is closed power fl...

Страница 40: ...is applied to the DC speed control boards The output voltage measured at A1 and A2 of the boards to the motors varies from 20 to130 VDC based on the DAC voltage applied to the board or the time progra...

Страница 41: ...ther mocouples 6 NOTE Two thermocouples are located be tween the middle convection fans in the rear of the oven Onethermocouple provides DC millivolts to the Hi Lo limit board The other provides DC m...

Страница 42: ...switch 19 The switch toggles if the temperature passing its face exceeds the rating on the back of the switch and may start the fans even if the oven is off If this switch is cold it should be made b...

Страница 43: ...perature controller Check thermocouples with a millivolt meter 2 Turn the heat switch 7 to ON Power goes to the N O terminal of the temperature controller 2 On a call for heat the temperature control...

Страница 44: ...tch 13 130 VDC motor 14 time display and motor drive 15 and a 2 Hall effect pick up 16 Refer to page 5 1 for pickup trouble shooting The motor speed varies based on the time programmed into the digita...

Страница 45: ...oven is shut down to keep the convection fans 6 operating until the unit reaches 135 170_F 57 77_C as sensed by the thermocouples 7 NOTE Two thermocouples are located be tween the middle convection f...

Страница 46: ...or flow through ventilation The other four in the rear of the oven keep the convection fans from overheating The cooling fans start when the motor contactor powers up and closes be tween terminals 3 a...

Страница 47: ...MT3255 and MT3270 3 21 1 2 3 4B 4A 5 5 5 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 20 20 20 20 20 21 22 23 24 25 26 27 28 29 30 FIGURE 6...

Страница 48: ...OPERATION 3 22 1 26 21 20 19 19 2 7 9 10 11 12 19 19 19 19 18 4A 4B 5 5 5 5 3 16 17 15 8 22 28 25 27 23 13 29 24 14 6 FIGURE 7...

Страница 49: ...MT3255 and MT3270 3 23 21 18 18 18 18 18 18 2 23 24 25 19 3B 3B 6 6 6 6 20 1 7 13 5 16 17 9 15 14 12 4 10 11 8 22 FIGURE 8...

Страница 50: ...OPERATION 3 24 1 21 18 18 18 18 19 2 4 3 5A 19 20 5B 13 16 17 17 17 17 14 15 8 6 7 9 10 11 12 22 FIGURE 9...

Страница 51: ...MT3255 and MT3270 3 25 21 20 22 17 17 17 17 18 17 17 2 19 1 6 3A 3B 5 5 5 5 12 4 15 16 8 9 10 11 7 FIGURE 10...

Страница 52: ...OPERATION 3 26 15 11 11 11 11 11 11 2 16 14 12 13 3A 3B 5 5 5 1 7 4 8 9 10 6 FIGURE 11...

Страница 53: ...MT3255 and MT3270 3 27 24 33 32 30 21 21 21 21 21 21 2 25 28 27 26 23 22 3 6 6 6 6 4 5 1 8 20 16 17 15 19 18 9 11 7 12 14 13 10 31 FIGURE 12...

Страница 54: ...eath to pop it from it s air seals 3 Notice the Air Flow Block off Plates After the amount of air flow required has been deter mined either remove or relocate the plate us ing the screws and wing nuts...

Страница 55: ...MT3255 and MT3270 3 29 This page intentionally left blank...

Страница 56: ...CALIBRATION AND ADJUSTMENT CHAPTER 4...

Страница 57: ...HECK LOW LIMIT 1 Turn the oven on and let it heat up to approxi mately 200_F 93_C 2 Shut the oven off The blowers should come back on in several seconds 3 When the blowers shut off turn the oven on If...

Страница 58: ...ressure Be sure to reinstall the screw cap should the dia phragm rupture this cap acts as a flow limiter The air shutter disc on the burner blower motor lo cated inside the control box at the top of t...

Страница 59: ...t Increase Time Slow Down Belt O N Dip Switch Detail 1 2 3 4 5 6 7 8 FIGURE 4 DIP SWITCH FUNCTION TABLE Switch 1 Program Constant Switch 2 Program Minimum Setting Switch 3 Program Maximum Setting Swit...

Страница 60: ...flip DIP switch 1 OFF 6 The display reads PROG NOTE If you change the constant the display set ting will be set to the slowest speed when you exit the Programming Mode Program Minimum Setting 1 Flip...

Страница 61: ...he motor s case Once the above specifications have been deter mined perform the following calibration proce dures 1 Remove the screws securing the cooking time display lens cover Remove the lens cover...

Страница 62: ...unter clockwise rotation raises the reading and decreases the temperature Check the oven set point Adjustment of the potentiometer may affect this reading Bring the oven up to 525_F 274_C Verify the c...

Страница 63: ...y will toggle between and a numerical value Setting the Deviation Band Alarm The deviation band alarm causes the display to flash when the actual temperature varies in either direction from the setpoi...

Страница 64: ...e controller 2 When the display reads 600_F 316_C the burner blower motor should shut off If the tem perature rises above 600_F 316_C adjust the hi limit pot FIGURE 8 so the burner shuts off at 600_F...

Страница 65: ...entries in the chart below If the data does not match the chart it should be changed accordingly When the correct data is dis played press the PROG ENTER key the display will cycle on to the next scr...

Страница 66: ...After pressing PROG ENTER the last time the dis play will show EXIT then beep and return to the ACCESS mode Pressing and holding the ON OFF key will turn the oven on A new time and tem perature must b...

Страница 67: ...ter the desired setpoint 3 Press the PROG ENTER key To program the temperature offset To change the temperature calibration an offset positive or negative must be programmed 1 Press PROG ENTER followe...

Страница 68: ...ery slowly during this part of the calibration procedure To minimize the time spent on STEP 2 measure off 10 on the conveyor support Place an object on the belt and note the travel time for the 10 mea...

Страница 69: ...losed loop sys tems this adjustment must be made quickly Low Speed Motor Adjustment Continue Belt Speed Calibration through STEP 3 see page 4 12 1 With the motor connected make no open cir cuit voltag...

Страница 70: ...tment Test Points Maximum Speed Minimum Speed Acceleration Adjustment ACC MAX MIN TORQ Socket J1 Line Fuse FL REG L N A1 A2 TB1 Speed Pot Yellow or Violet pin 12 Blue pin 8 Torque current limiting adj...

Страница 71: ...contact your local gas sup plier for values Use the following formulas to calculate the correct orifice 1 Firing rate of burners BTU per burner 2 BTU per burner Heating value of Gas CuFt hr 3 CuFt Hr...

Страница 72: ...ural Gas 1000 x 120 120 000 BTU Propane 2550 x 120 306 000 BTU Butane 3000 x 120 360 000 BTU NOTE You may also use TABLE XII from the National Fuel Gas Code Handbook to aid in determining the firing r...

Страница 73: ...MT3255 and MT3270 4 17 This page intentionally left blank...

Страница 74: ...TROUBLESHOOTING CHAPTER 5...

Страница 75: ...e D Replace potentiometer Symptom 2 Belt does not move closed loop systems D Conveyor switch is turned off D DC motor is leaking oil D Motor ohms out higher than 162 D Motor ohms out lower than 100 D...

Страница 76: ...nhook and repair problem D Replace fuse Determine amp draw D Replace fuse Determine amp draw D Verify the unit is set for a single pulse pickup If not reset for a single pulse pickup If yes reattach t...

Страница 77: ...blower switch D Replace motor contactor Symptom 2 Blower motor s do not shut off D Faulty motor contactor D Faulty thermocouple on Hi Lo board D Faulty Hi Lo board D Hi Lo board is not adjusted prope...

Страница 78: ...o low D Turn the oven on D Determine if the circuit breaker is tripped D Replace the fuse D If the setpoint is not above the actual reset ac cordingly D Reference Technical Appendix page 6 1 through 6...

Страница 79: ...witch out to ON D Reset breaker D Check transformer for primary and secondary voltage D Check main control and burner valve relays to see if closed D Check relay in combustion burner box If bad re pla...

Страница 80: ...ller has been programmed the computer may need to be replaced Symptom 3 Oven will not reach desired temperature D Gas pressure to oven is too low D Top air plates missing or not adjustable D Faulty RT...

Страница 81: ...nt If above 140_F 60_C check the cooling fan operation D Use the chart in the Technical Appendix page 6 4 to determine if probe is bad Replace if nec essary D The inside of the oven should be cleaned...

Страница 82: ...TECHNICAL APPENDIX CHAPTER 6...

Страница 83: ...t the control through the flame sensor cable to the flame sensor As the current is conducted through the flame to the pilot hood it is rectified from AC to DC because of the difference in surface area...

Страница 84: ...ower supply to the ignition con trol 2 Disconnect the flame sensor cable from termi nal 4 on Johnson units or terminal 15 on Landis Gyr units 3 Set the selector switch on the meter to micro amp scale...

Страница 85: ...must be secure 6 Restore the power and the gas supply to the appliance 7 IMPORTANT Using a microammeter check the signal passing through the sensing probe 8 If the microamp signal is marginal trim th...

Страница 86: ...290 774 11 450 938 118 615 1102 447 135 610 86 295 779 31 455 943 17 620 1107 35 140 616 2 300 784 5 460 948 216 625 1112 249 145 621 52 305 789 68 465 953 259 630 1117 1 150 626 85 310 794 87 470 958...

Страница 87: ...90 7 641 7 794 300 7 947 8 100 310 8 253 8 407 320 8 560 8 714 330 8 867 9 021 340 9 175 9 329 350 9 483 9 636 _F Reading 5_F 360 9 790 9 944 370 10 098 10 252 380 10 407 10 561 390 10 715 10 869 400...

Страница 88: ...ters meters 3 281 feet pounds 4536 kg inches W C 249082 kPa 2 49082 mbar kPa 4 01885 inches W C 10 mbar mbar 0 401474 inches W C kW 3 6 Mj hr kcal m3 1122952 BTU ft3 Kwh m3 96 65 BTU ft3 TABLE 4 PRESS...

Страница 89: ...4 27 37 2737 2 737 12 4331 8818 304 8 22 412 0304 0299 29 86 2986 2 986 13 4692 9553 330 2 24 280 0330 0324 32 35 3235 3 235 14 5053 1 029 355 6 26 148 0355 0348 34 84 3484 3 484 15 5414 1 102 381 0 2...

Страница 90: ...40 1 444 2 940 1016 74 72 1015 0996 99 56 9956 9 956 41 1 480 3 013 1042 76 59 1040 1020 102 0 10204 10 20 42 1 516 3 086 1067 78 45 1066 1045 104 5 10452 10 45 43 1 552 3 160 1092 80 31 1091 1070 10...

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