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TBG36-CM, TBG36-FM AND TBG36-S
ELECTRIC CONVEYOR GRILL
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 G0173 Rev A (7/01)
E 2001 --- MagiKitch'n Incorporated
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Table of Contents
Troubleshooting
Related Manuals for Blodgett TBG36-FM
Summary of Contents for Blodgett TBG36-FM
- Page 1 TBG36-CM, TBG36-FM AND TBG36-S ELECTRIC CONVEYOR GRILL 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 G0173 Rev A (7/01) E 2001 --- MagiKitch’n Incorporated...
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Page 2: Table Of Contents
TABLE OF CONTENTS 1. INTRODUCTION Unit Description ..............1---1 Specifications . - Page 3 TABLE OF CONTENTS 6. MISCELLANEOUS COMPONENTS Hourmeter ............... 6---1 Drive Motor .
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Page 4: Introduction
CHAPTER 1 INTRODUCTION... -
Page 5: Unit Description
The conveyor cooking technique assures consis- controlled conveyorized belt cooking grill built by tent, dependable results. By precisely controlling Blodgett. The Blodgett Conveyor Grill uses two Tef- all the variables --- cooking time, temperature, belt lon coated woven fiberglass belts each encircling speed and product contact pressure --- the possi- an electrically heated aluminum cooking platen. -
Page 6: Specifications
1545 lbs (701 kg) Uncrated 580 lbs (263 kg) 690 lbs (313 kg) 1445 lbs (655 kg) NOTE: * Includes 1.5” ( 3.81 cm) box on rear cover. TABLE 1 TBG36-CM/AA, TBG36-FM and TBG36-S/AA ELECTRICAL SPECIFICATIONS Volts Phase Amps 60/50 60/50 60/50... -
Page 7: Required Service Tools
This kit will be billed at full price with able from Blodgett under part number G0235, TBG replacements made for warranty usage when ac- Service Tools Kit. In either case, the tools will be companied by complete documentation. -
Page 8: Wiring Diagrams
INTRODUCTION WIRING DIAGRAMS FIGURE 2 1---4... - Page 9 BLODGETT CONVEYOR GRILL FIGURE 3 1---5...
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Page 10: Unit Controls
CHAPTER 2 UNIT CONTROLS... -
Page 11: Controls Identification
11. MAIN POWER SWITCH --- An ON-OFF rotary switch for emergency or convenience use which controls all electrical power inside the TBG36-S Control unit. When power is on, the display lights up. FIGURE 1 TBG36-CM and TBG36-FM Control FIGURE 2 2---1... -
Page 12: Programming Flow Chart
UNIT CONTROLS PROGRAMMING FLOW CHART Power Switch Press DOWN ARROW KEYS to set Turn PH = BH KEYSWITCH to vertical position CHANGE SPELLING Belt Speed Press ENTER Select letter Display reads with display reads PROG?A ARROW KEYS T = XX.XX CONTINUE Press the SPELLING... -
Page 13: Operation Flow Chart
BLODGETT CONVEYOR GRILL OPERATION FLOW CHART Turn on MAIN POWER SWITCH (turn knob to right) Cooking cycle Release complete EMERGENCY LIFT T=00:00 if set (turn knob to right) Push OFF/CANCEL Push Red display reads EMERGENCY LIFT remaining time button Turn... -
Page 14: Calibration Flow Chart
UNIT CONTROLS CALIBRATION FLOW CHART THE PASSWORD MODE ALLOWS ACCESS TO THE PROGRAM- START/POWER MING LOGIC AREA OF THE MICROPROCESSOR CONTROLLER. switch on DO NOT ATTEMPT TO ALTER A SETTING WITHOUT A COMPLETE UNDERSTANDING OF THE CONTROLLER AND ITS PROGRAM- MING AND A DIRECT CONSULTATION/APPROVAL FROM BLOD- Turn KEY to program GETT TECHNICAL SERVICE, 888-992-6624. - Page 15 BLODGETT CONVEYOR GRILL Change all cooking menu parameters while operating Press ENTER and Display reads T = XX:XX LIFT ENABLE Press ENTER Display reads (counts down until up release ENTER then a menu key 4:TEST COOK (hold LIFT ENABLE to temperature)
- Page 16 UNIT CONTROLS FOR TECHNICIAN ONLY Shows main control board is picking up magnetic speed control output Press ENTER Press ENTER display reads Display reads display reads S = XXXXX 8:SET TIME T = X:XX (shows fluctuating number) (shows a time value) pick up is working “OK”...
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Page 17: Controller Removal And Replacement
BLODGETT CONVEYOR GRILL CONTROLLER REMOVAL AND REPLACEMENT If repeated nuisance blowing of fuses persists, the 1. Remove the power supply as follows: current rating of any of the fuses may be increased A.) Remove the three screws securing the to 5 amperes. The following are symptoms for a... - Page 18 UNIT CONTROLS 2. Remove the main board as follows: B.) Remove the screws securing the fuse mounting bracket and move this out of the A.) Remove all other Molex connectors from way to allow the main board mounting the main board. Note which connector panel and main board to be removed as an goes to which pin location on the board.
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Page 19: Switch Replacement
BLODGETT CONVEYOR GRILL SWITCH REPLACEMENT The following procedure describes how to replace A.) Remove the wiring from the back of the the Emergency Lift, Power and Lift Enable switches. switches. 1. Remove the drive motor to gain access to the B.) Turn the black plastic tab securing the... - Page 20 UNIT CONTROLS Emergency Switch Components Mounting Block Contact Block Actuator Assembly Complete Emergency Switch Assembly (Note tips of screws protruding out of mounting block. These screws must be tightened against the sheetme- tal to secure the actuator in place before assembling the contact block assembly to the mounting block.) FIGURE 15 2---10...
- Page 21 BLODGETT CONVEYOR GRILL This page intentionally left blank. 2---11...
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Page 22: Temperature Control
CHAPTER 3 TEMPERATURE CONTROL... -
Page 23: Description
BLODGETT CONVEYOR GRILL DESCRIPTION The temperature control circuitry for the Blodgett differential set point and reaches the correct cook- Conveyor Oven employs two (2) J-type thermo- ing temperature. The controller de-energizes the couples located at the infeed and outfeed ends of contactor, cutting power to the heating elements. -
Page 24: Wiring Diagram
TEMPERATURE CONTROL WIRING DIAGRAM FIGURE 2 3---2... -
Page 25: Troubleshooting
BLODGETT CONVEYOR GRILL TROUBLESHOOTING A problem with uneven cooking or undercooking of food on the top and/or bottom surface may be the result of a temperature control malfunction. It Pillow Block is advisable to use the Cooking Troubleshooting Guide in isolating the cause of the problem. Pos-... -
Page 26: Overtemperature Safety Thermostat Circuit
TEMPERATURE CONTROL OVERTEMPERATURE SAFETY THERMOSTAT CIRCUIT A problem with the overtemperature safety circuit an ohmmeter to find the open device. This is indicated when a hot grill shuts off for no appar- must be accomplished before the thermostat ent reason. There is a noticeable thunk sound from cools down and resets itself. -
Page 27: Thermocouple Diagnostic Procedure
BLODGETT CONVEYOR GRILL THERMOCOUPLE DIAGNOSTIC PROCEDURE 1. Visually inspect for any broken wires. Check at control board connector J-4 for any bare wires touching one another or ground. 2. To test suspect thermocouples at room tem- perature, unplug the Molex connector from J-4 on the controller board and measure the ther- mocouple’s output (temperature) using the... - Page 28 TEMPERATURE CONTROL Ref. Figure Red + Probe Black -- Probe Result FIGURE 9 Each socket on the Ground lug on unit*. Should read open (no continuity, no (Rule out white Molex plug, beep). If it does not, note the socket thermocouple one at a time*.
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Page 29: Platen Contactor Diagnostic Procedure
BLODGETT CONVEYOR GRILL PLATEN CONTACTOR DIAGNOSTIC PROCEDURE 1. Disconnect supply power by opening the cir- 4. Check that there is an open circuit (infinite re- cuit breaker to de-energize the unit. sistance) across each of the pole pairs of the contactor. -
Page 30: Platens
CHAPTER 4 PLATENS... -
Page 31: Description
BLODGETT CONVEYOR GRILL DESCRIPTION The upper and lower platens are made from cast metal filler strips and a cover surround the platen aluminum with an electroless nickel coating. Three to protect the thermocouples and to improve incoloy sheathed elements are cast into each plat- cleanability. -
Page 32: Platen Diagnostic Procedure
PLATENS PLATEN DIAGNOSTIC PROCEDURE locating and measuring the current draw on WARNING!! the individual supply wires to each of the plat- ens at their contactor. Be careful, you will be Be careful! You will be working near LIVE working with a live, hi-voltage circuit. Refer to AC power of 208 volts or greater! TABLE 1 for correct line draws for the platen. -
Page 33: Platen Removal And Replacement
BLODGETT CONVEYOR GRILL PLATEN REMOVAL AND REPLACEMENT PLATEN REMOVAL 1/2-13 Platen Adjustment Nut, Mounting Filler Bolt & Spacer Washer 1. Remove the wipers and belts from both platen Lug Bolts Strip assemblies. Clean the platen assemblies be- fore proceeding with any disassembly. - Page 34 PLATENS 5. Disconnect the unit from its power supply. 7. Pull the safety thermostat sensor bulb from the Note that there are three elements in each plat- rear of the unit and out of its thermowell in the en and six wires leading from these three ele- platen side entry.
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Page 35: Platen Replacement
BLODGETT CONVEYOR GRILL PLATEN REPLACEMENT 1. Assemble the frame members, filler strips, 3. Put the unit in MENU mode. Press the CLEAN drive roller, drive shaft, spring washers, and re- button to move the platen assemblies all the placement platen in place on the unit. Secure way apart. -
Page 36: Platen Alignment
PLATENS PLATEN ALIGNMENT 1. If a new platen is being aligned, turn all the up- 3. Adjust the upper and lower platen bolts up and per and lower platen adjustment bolt/nut com- down as necessary to align the platens to each binations, using two wrenches, until the sup- other using the 1/2”... - Page 37 BLODGETT CONVEYOR GRILL This page intentionally left blank. 4---7...
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Page 38: Position Control
CHAPTER 5 POSITION CONTROL... -
Page 39: Description
BLODGETT CONVEYOR GRILL DESCRIPTION The positioning control uses a 24 VDC lift motor The height of the upper platen deck over the lower (linear actuator) with internal limit switches and an platen is measured by a linear potentiometer external 2000 W linear potentiometer with a 2-inch mounted on the sliding carriage assembly inside. -
Page 40: Troubleshooting
POSITION CONTROL TROUBLESHOOTING POSSIBLE CAUSE(S) SUGGESTED REMEDY SYMPTOM: Measured gap between platens never agrees with the display value --- too high or too low. Unit not calibrated properly. Follow instructions to adjust jam nuts on the linear potentiometer. SYMPTOM: Measured gap between platens sometimes doesn’t agree with display value. Check linear potentiometer shaft for freedom of Clean shaft. -
Page 41: Wiring Diagram
BLODGETT CONVEYOR GRILL WIRING DIAGRAM FIGURE 2 5---3... -
Page 42: Lift Motor
LIFT MOTOR SETTING LIFT MOTOR LIMIT SWITCHES NOTE: You may use the 24 VDC power supply avail- able from Blodgett Technical Support to per- NOTE: Complete the Lift Motor Diagnostics Pro- form these operations. This power supply cedure before setting the lift motor limit has connectors that plug into the lift motor switches. -
Page 43: Removing And Replacing The Lift Motor
BLODGETT CONVEYOR GRILL REMOVING AND REPLACING THE LIFT MOTOR 1. Insert a 2” thick board or other non-marring ob- jects between the platen assemblies to sup- port the weight of the upper platen. 2. Energize the unit and go to the [1:LIFT CAL] mode. -
Page 44: Linear Potentiometer
POSITION CONTROL LINEAR POTENTIOMETER DIAGNOSTIC PROCEDURE CALIBRATION 1. Disconnect the cable from J-8 on the control NOTE: Before calibrating the potentiometer the platen alignment must be checked and re- board. vised as necessary. Refer to Platen section 2. Check the resistance between each pair of for procedures. - Page 45 BLODGETT CONVEYOR GRILL This page intentionally left blank. 5---7...
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Page 46: Miscellaneous Components
CHAPTER 6 MISCELLANEOUS COMPONENTS... -
Page 47: Hourmeter
BLODGETT CONVEYOR GRILL HOURMETER The Blodgett Conveyor Grill is equipped with a 120 4. Shut off the power supply and while the plat- VAC hourmeter wired in parallel with the control ens are still heated to over 200 degrees, check board power supply. -
Page 48: Drive Motor
MISCELLANEOUS COMPONENTS DRIVE MOTOR DESCRIPTION tion is reported by a 60-pole magnetic disk rotor on the gearmotor tail shaft and measured by a hall ef- The belt drive system consists of a 130 VDC gear- fect sensor connected to the controller by a cable motor, a magnetic speed sensor and disk rotor, a connected to J-7 on the control board. -
Page 49: Drive Train Troubleshooting Guide
BLODGETT CONVEYOR GRILL DRIVE TRAIN TROUBLESHOOTING GUIDE The gearmotor control circuitry has proven to be Mark the belt by placing a small wet ball of paper very reliable. Any problems relating to speed con- towel at the infeed and time the mark’s travel from trol have proven to be mechanical in nature;... -
Page 50: Drive Motor Removal And Replacement
MISCELLANEOUS COMPONENTS DRIVE MOTOR REMOVAL AND REPLACEMENT NOTE: If necessary, go into MENU or PSWD mode 6. Loosen/remove the four bolts securing the to make sure the platens are moved down drive motor to the unit, and remove the drive into a normal cooking height, not the motor. - Page 51 BLODGETT CONVEYOR GRILL 9. Reverse the procedure to reinstall the drive motor, adding the following steps: A.) Replace any wire ties removed in the ex- change, bundling the wires just as they were. B.) Make sure the upper platen thermostat...
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Page 52: Drive Motor Components Wiring Diagram
MISCELLANEOUS COMPONENTS DRIVE MOTOR COMPONENTS WIRING DIAGRAM FIGURE 7 6---6... -
Page 53: Speed Sensor Removal And Replacement
BLODGETT CONVEYOR GRILL SPEED SENSOR REMOVAL AND REPLACEMENT 1. Loosen the setscrew securing the speed sen- leads to the cable ends exactly as removed. In- sor disk to the drive motor tail shaft. Remove sulate carefully by heat-setting the shrinkable the speed sensor disk. -
Page 54: Drive Roller And Bearing Block Removal And Replacement
MISCELLANEOUS COMPONENTS DRIVE ROLLER AND BEARING BLOCK REMOVAL AND REPLACEMENT The drive rollers are secured to shafts supported 8. Spread the rear frame member slightly by by spherical bearings mounted in plastic pillow wedging a small screwdriver between it and blocks which slide into the outfeed ends of the plat- the drive roller. - Page 55 BLODGETT CONVEYOR GRILL 10. With the drive shaft just extending past the oth- er end of the drive roller, pull the drive roller up as far as possible to allow the second spring washer to be put in place over the end of the shaft.
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Page 56: Idle Roller Tension Blocks
MISCELLANEOUS COMPONENTS IDLE ROLLER TENSION BLOCKS Belt tensioning is provided by springs located be- 5. Grab the end of the spring in a vise and com- hind the nylon idle roller tension blocks. The idle press it by pushing on the bolt and block until roller tension block/spring assembly is secured to the end of the bolt sticks out past the spring. -
Page 57: Wipers
BLODGETT CONVEYOR GRILL WIPERS 1. The upper wiper assembly snaps onto four 2. The lower wiper assembly hangs from two screw heads on the outfeed end of the upper brackets with keyhole slots that engage two platen frame. screws under the lower platen frame mem- bers. -
Page 58: Maintenance
CHAPTER 7 MAINTENANCE... -
Page 59: Service Checks
Fill out entry in “Service Log” and fax copy to Check and adjust platen alignment if out of Blodgett Technical Support at 802-860-3784. parallel by more than .062. Grease drive roller fittings with food service grade grease when applicable.
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