Blodgett TBG-36 Service Manual
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 T elephone (800) 331-5842, (802) 860-3700 Fax: (802)864-0183
PN G0173 Rev A (7/01)
E 2001 --- MagiKitch’n Incorporated
TABLE OF CONTENTS
1. INTRODUCTION
Unit Description 1 --- 1..................................................................
Specifications 1 --- 2....................................................................
Required Service Tools 1 --- 3............................................................
Electrical Safety 1 --- 3..................................................................
Wiring Diagrams 1 --- 4..................................................................
2. UNIT CONTROLS
Controls Identification 2 --- 1.............................................................
Programming Flow Chart 2---2..........................................................
Operation Flow Chart 2 --- 3.............................................................
Calibration Flow Chart 2 --- 4.............................................................
Controller Removal and Replacement 2---7...............................................
Switch Replacement 2 --- 9..............................................................
3. TEMPERATURE CONTROL
Description 3 --- 1......................................................................
Wiring Diagram 3 --- 2...................................................................
Troubleshooting 3 --- 3..................................................................
Thermostats 3 --- 3..................................................................
Overtemperature Safety Thermostat Circuit 3---4.......................................
Thermocouple Diagnostic Procedure 3---5................................................
Platen Contactor Diagnostic Procedure 3---7..............................................
4. PLATENS
Description 4 --- 1......................................................................
Platen Diagnostic Procedure 4---2.......................................................
Platen Removal and Replacement 4---3..................................................
Platen Removal 4 --- 3...............................................................
Platen Replacement 4 --- 5...........................................................
Platen Alignment 4 --- 6.................................................................
5. POSITION CONTROL
Description 5 --- 1......................................................................
Troubleshooting 5 --- 2..................................................................
Wiring Diagram 5 --- 3...................................................................
Lift Motor 5 --- 4........................................................................
Diagnostic Procedure 5---4..........................................................
Setting Lift Motor Limit Switches 5---4................................................
Removing and Replacing the Lift Motor 5---5..........................................
Linear Potentiometer 5 --- 6..............................................................
i
TABLE OF CONTENTS
6. MISCELLANEOUS COMPONENTS
Hourmeter 6 --- 1.......................................................................
Drive Motor 6 --- 2......................................................................
Description 6 --- 2...................................................................
Drive Train Troubleshooting Guide 6--- 3..............................................
Drive Motor Removal and Replacement 6--- 4..........................................
Drive Motor Components Wiring Diagram 6--- 6........................................
Speed Sensor Removal and Replacement 6---7...........................................
Drive Roller and Bearing Block Removal and Replacement 6--- 8............................
Idle Roller T ension Blocks 6-- -10..........................................................
Wipers 6 --- 1 1..........................................................................
7. MAINTENANCE
Service Checks 7 --- 1...................................................................
ii
CHAPTER 1
INTRODUCTION
BLODGETT CONVEYOR GRILL
UNIT DESCRIPTION
The Blodgett Conveyor Grill is a microprocessor
controlled conveyorized belt cooking grill built by
Blodgett. The Blodgett Conveyor Grill uses two Teflon coated woven fiberglass belts each encircling
an electrically heated aluminum cooking platen.
Food placed on the lower belt travels over a preheat zone where the product is s lightly thaw ed (in
the case of frozen food) and then between the upper and lower platens where it is cooked on both
sides simultaneously. After cooking, the food falls
into a receiving pan. During the cooking process,
wipers remove excess grease from the belts and
collect it in a grease pa n or bucket in the bottom of
the unit.
Main Power Switch
Lift Enable Button
Emergency Lift Button
Upper Wiper Assembly
The conveyor cooking technique assures consistent, dependable results. By precisely controlling
all the variables --- cooking time, temperature, belt
speed and product contact pressure --- the possibility of improper cooking due to operator error or
inconsistency is greatly minimized. However, it is
still the responsibility of the person(s) operating the
machine to periodicallycheck that the food is properly cooked. The microprocessor controller provides six easy to use programmable menu selections at the push of a button.
Control Panel
Upper&LowerConveyorBelts
Idle Roller
Lower Wiper Assembly
Baffle & Pan Guide
Drain Trough
Upper Platen Deck
Lower Platen Deck
Crumb Tray
Food Receiving Pan
Grease Pan
Door Panel
FIGURE 1
1 --- 1
SPECIFICATIONS
INTRODUCTION
DIMENSIONS AND WEIGHT SPECIFICATIONS
TBG36-CM/AA
Counter Model
Width 35.75” (91 cm) 35.75” (91 cm) 43” (109 cm)
Height 31.5” (80 cm) 49.5” (126 cm) 69” (175 cm)
Depth 33.75” (86 cm)* 33.75” (86 cm)* 33.75” (86 cm)*
Weight
Crated
Uncrated
NOTE: * Includes 1.5” ( 3.81 cm) box on rear cover.
TBG36-CM/AA, TBG36-FM and TBG36-S/AA ELECTRICAL SPECIFICATIONS
Hz Vol ts Phase Amps
60/50 208 3 50
60/50 220 3 47
680 lbs (308 kg)
580 lbs (263 kg)
TABLE 1
TBG36-FM/AA
Floor Model
790 lbs (353 kg)
690 lbs (313 kg)
TBG36-S/AA
Stackable Model
1545 lbs (701 kg)
1445 lbs (655 kg)
60/50 240 3 43
60/50 440 3 24
60/50 480 3 22
60/50 380 3 27
60/50 415 3 25
A 3 phase, 50/60 Hz, 3-wire grounded equipment branch circuit, permanently connected in accordance with applicable articles of ANSI/NFPA 70 (NEC code), is required. The stack capacity unit
requires tw o identical circuits.
Provision is made for 1-1/2” trade size conduit for incoming power. UL Listed reducing seals (donut washers) will be required if a smaller size fitting is used. See the Electrical Installation Manual,
P/N 31-12-11343 for details.
Stack capacity (TBG36-S) model requires (2) power feeds, (1) for each cooking section. The stack
capacity design is not currently UL listed in Canada.
TABLE 2
1 --- 2
BLODGETT CONVEYOR GRILL
REQUIRED SERVICE TOOLS
In addition to tools normally used when servicing
appliances, you may need the following tools:
These tools can be ordered individually from Blodgett Technical Service (888-992-6624 phone;
802-860-3784 fax) using the Blodgett part numbers shown or a complete kit of these items is available from Blodgett under part number G0235, TBG
Service Tools Kit. In either case, the tools will be
supplied at cost with no mark-up on a one-time ba-
QTY
1 Digital Multimeter Amprobe AM-1260 or similar;
1 Clamp-on ammeter Amprobe model RS-3 or similar;
1 24 VDC lift motor power supply (optional) Blodgett P/N G0239
1 Molex Mini fit crimping tool Molex 11-01-0197-P;
1 Molex Mini fit pin extraction tool Molex 11-03-0044;
DESCRIPTION P/N
sis. Replacement tools will be billed at the usual
dealer/agency price.
A Service Parts Replacement Kit (part number
G0236) is also available. This kit contains pa rt s that
normally require replacement and a few critical
components. This kit will be billed at full price with
replacements made for warranty usage when accompanied by complete documentation.
Blodgett P/N G0237
Blodgett P/N G0238
Blodgett P/N G0240
Blodgett P/N G0241
20 Molex Mini fit Jr. female pins Molex 39-00-0039;
Blodgett P/N G0242
1 Anti-seize compound, food grade, can McMaster 1404K11 or similar;
Blodgett P/N G0243
TABLE 3
ELECTRICAL SAFETY
De-energizing the unit
For servicing purposes throughout this manual,
two distinct operations are referred to frequently
and their meaning must be understood clearly for
your safety. One is the use of the Main Power
Switch and the other is “disconnect supplypower”.
The main power switch turns the Blodgett Conveyor Grill on and off for all user purposes. When working inside the machine, however, the main power
feed wires and over-temperature protection ther-
mostat wiring are very much alive and remain so
whetherthemainpowerswitchisonoroff.
To de-energize the machine completely, the
supply power must be disconnected at the circuit breaker or (fused) disconnect switch labeled for this unit.
NOTE: Stack capacity units have separate power
supplies. Be sure the power has been
turned off for the appropriate unit.
1 --- 3
WIRING DIAGRAMS
INTRODUCTION
FIGURE 2
1 --- 4
BLODGETT CONVEYOR GRILL
FIGURE 3
1 --- 5
CHAPTER 2
UNIT CONTROLS
BLODGETT CONVEYOR GRILL
CONTROLS IDENTIFICATION
1. SELECT/DISPLAY --- used to select the display information.
2. UP and DOWN ARROW --- u s e d i n p r o g r a m ming to increase/decrease selection choices.
3. ENTER --- used to enter a menu selection into
the current program.
4. OFF/CANCEL --- cancels the current menu so
another may be entered.
5. KEYSWITCH --- requires a key to change from
MENU mode to PROGRAM mode.
6. CLEAN --- raises the upper platen for thorough
cleaning.
7. MENU buttons --- used in the MENU mode to
load programming for products A through F.
Used in PROGRAM mode to select menu designations and product descriptions.
8. DISPLAY --- displays the menu and program
mode information selected.
9. EMERGENCY LIFT --- immediately raises the
upper platen to the clean position. Push and
turn to reset/release button.
11
10
1
8
7
9
2
3
4
2
5
6
10. LIFT ENABLE --- a safety feature requiring the
operator to hold the button in while moving the
platen to a cooking position after a programming adjustment or menu change.
11. MAIN POWER SWITCH --- An ON-OFF rotary
switch for emergency or convenience use
which controls all electrical power inside the
unit. When power is on, the display lights up.
10
11
TBG36-CM and TBG36-FM Control
FIGURE 2
TBG36-S Control
FIGURE 1
89
7
1 2 3
526
4
2 --- 1
PROGRAMMING FLOW CHART
Power Switch
ON
Turn
KEYSWITCH
to vertical
position
Display reads
PROG?A
YES
NO
Belt Speed
A
Press
ARROW KEYS
to set
PH = BH
UP
Press ENTER
display reads
T=XX.XX
UNIT CONTROLS
DOWN
CHANGE SPELLING
Select letter
with
ARROW KEYS
L E T T E R K E Y A --- F
Top H e a ter
Press ENTER
display reads
ARROW KEYS
to set temp
Bottom Heater
Press ENTER
display reads
TBG60
ARROW KEYS
to set temp
Press the
youwishto
program
TH = XXX
Press
UP
BH = XXX
Press
DOWN
TBG36
DOWN
ARROW KEYS
to set time
Height Between
Platens
Change
Food Product
Descriptions
Press ENTER
display reads
H=XX.XX
ARROW KEYS
to set height
Press ENTER
display reads
FOOD PRODUCT
Press
Press
Change
product
spelling?
UP
UP
DOWN
DOWN
YES
CONTINUE
SPELLING
Press
ENTER to lock
in letter
DONE
Press
SELECT DISPLAY
Display reads
SAVE A>F
Press ENTER
display reads
SAVING
Display reads
PROG?A
Finished
programming
Preheater
Press ENTER
display reads
PH = XXX
A
UP
NO
NOTES:
_
All temperature setting must be less than or equal to 450
Platen height (H = X.XXX) must be less than or equal to 1.900” and greater than or
equal to 0.100”
Belt speed (T = X.XXX) must be less than or equal to 10 minutes and greater than or
equal to 30 seconds.
F
FIGURE 3
2 --- 2
BLODGETT CONVEYOR GRILL
OPERATION FLOW CHART
Turn on
MAIN POWER
SWITCH
(turn knob to right)
A
Release
EMERGENCY LIFT
if set
(turn knob to right)
Turn
KEYSWITCH
to Menu
(horizontal position
display reads
MENU?A
Press (1) desired
menus selection
button A ---F
Press and hold
ENTER and LIFT ENABLE
buttons at the same time
oven beeps
Release ENTER
hold LIFT ENABLE
until upper platen lowers
to cooking height and
stops
Push Red
EMERGENCY LIFT
button
Cooking cycle
complete
T=00:00
Push OFF/CANCEL
display reads
remaining time
T=XX:XX
Push
OFF/CANCEL
Finish
select new program
Display reads
STANDBY
platens preheat and
counts down from 15 min.
T=XX:XX
Roller and belts start
moving
Blodgett Conveyor Grill
ready to cook
(display scrolls cooking
description)
A
FIGURE 4
2 --- 3
CALIBRATION FLOW CHART
UNIT CONTROLS
START/POWER
Turn KEY to program
(vertical position)
Press SELECT DISPLAY
Display reads PSWD?::
Unlocks Display
Press ENTER then A
Display reads
0:SELECT MODEL
Press ARROW key
to continue
programming
display reads
1:LIFT CAL
Press ARROW key
to continue
programming
2:CJ CAL
switch on
Press
A button
Display
reads
Change linear pot
calibration
Calibrate thermocouple
cold junctions
THE PASSWORD MODE ALLOWS ACCESS TO THE PROGRAMMING LOGIC AREA OF THE MICROPROCESSOR CONTROLLER.
DO NOT ATTEMPT TO ALTER A SETTING WITHOUT A COMPLETE
UNDERSTANDING OF THE CONTROLLER AND ITS PROGRAMMING AND A DIRECT CONSULTATION/APPROVAL FROM BLODGETT TECHNICAL SERVICE, 888-992-6624. THIS AREA IS USED
FOR INITIAL CALIBRATION, MENU DEVELOPMENT, TESTING
COMPONENT FUNCTION AND ADJUSTING PROGRAM VARIABLES BY A SERVICE TECHNICIAN. THIS AREA SHOULD NOT BE
ACCESSED BY THE USER.
Press ENTER
display reads
TBG36 or TBG60
When finished
Press ENTER
Press ENTER
display reads
H=X.XXX
When finished
Press
OFF/CANCEL
Press ENTER
display reads
CJ=XX
Press ARROW
keys to
select
Press ARROW keys
and LIFT ENABLE to
set height. Calibrate with
known dimension
Press ARROW keys
to adjust. Use external
meter for calibration
Press ARROW key
to continue
programming
Display reads
3:TEMP CAL
Press ARROW key
to continue
programming
A
When finished press
OFF/CANCEL
Calibrate 3 platens
to external reference
Press
OFF/CANCEL
Press ENTER
Press ENTER
display reads
SET = 400
Set
TH = SET
BH = SET
PH = SET
with ARROW keys
Set each
temperature by
pressing ENTER
FIGURE 5
2 --- 4
to save
Press ARROW
keys to set
temperature
Scroll display with
SELECT DISPLAY
compare
temperature with
external meter
Press ENTER
3 platens heat
to temperature
and stabilize
BLODGETT CONVEYOR GRILL
A
Change all cooking
menu parameters while
operating
Display reads
4:TEST COOK
Press ENTER
then a menu key
A --- F
Press ENTER and
LIFT ENABLE
release ENTER
(hold LIFT ENABLE
until platen stops moving)
Display reads
T = XX:XX
(counts down until up
to temperature)
belts start moving
Press ARROW key
to continue
programming
Display reads
5:SET TOPHEAT
Press ARROW key
to continue
programming
Display reads
6:SET BOT HEAT
Press ARROW key
to continue
programming
Display reads
7:SET PREHEAT
Change top
platen temperature
(actual platen temp)
Press OFF/CANCEL
Change bottom
platen temperature
(actual platen temp)
Press OFF/CANCEL
Change preheat
platen temperature
(actual platen temp)
Default to old setting
Press OFF/CANCEL
Save changes
press ENTER
Press ENTER
display reads
T = XXX
twice to exit
Press ENTER
display reads
T = XXX
twice to exit
Press ENTER
display reads
T = XXX
When
done
press
OFF/CANCEL
Press OFF/CANCEL
display reads
TH XXX
(current platen temp)
Press OFF/CANCEL
display reads
BH XXX
(current platen temp)
Press OFF/CANCEL
display reads
PH XXX
(current platen temp)
Press SELECT/DISPLAY
Use ARROW keys to select
parameter to change
TH BH PH T H
(change to desired setting)
Press ARROW keys
to adjust temperature
Press ENTER
display reads
T = XXX
(shows platens temp)
Press ARROW keys
to adjust temperature
Press ENTER
display reads
T = XXX
(shows platens temp)
Press ARROW keys
to adjust temperature
Press ARROW key
to continue
programming
Press OFF/CANCEL
twice to exit
Press ENTER
display reads
T = XXX
(shows platens temp)
B
FIGURE 6
2 --- 5
Display reads
Press ARROW key
to continue
programming
Display reads
SET HEIGHT
Press ARROW key
to continue
programming
B
8:SET TIME
Discontinues all
password setting
8through10
FOR TECHNICIAN ONLY
Shows main control board is
picking up magnetic speed
control output
Obsolete Function
LIFT CAL does the
same function
Press
OFF/CANCEL
twice to exit
Press ENTER
display reads
T = X:XX
(shows a time value)
Press ENTER
display reads
P=X.XXX
(current position)
When finished
display reads
P = X.XXX
UNIT CONTROLS
Press ENTER
display reads
S=XXXXX
(shows fluctuating number)
pick up is working “OK”
Press OFF/CANCEL
twice to exit
Press OFF/CANCEL
display reads
P = X.XXX
(adjust to desired height)
Press ENTER
platen will adjust
Display reads
10:STOP ALL
Press ARROW key
to continue
programming
Display reads
11:DEFAULT MENU
Press ARROW key
to continue
programming
Scroll through the
following
12:EE WORD
13:EE BYTE
14:SET CHECKSUM
FINISHED
Only to change all
menus to preset variables
RESTRICTED
DO NOT ACCESS
FOR ENGINEERING
ONLY
Press ENTER
to change
Press ENTER
to change
Press OFF/
CANCEL
to exit
FIGURE 7
2 --- 6
BLODGETT CONVEYOR GRILL
CONTROLLER REMOVAL AND REPLACEMENT
If repeated nuisance blowing of fuses persists, the
current rating of any of the fuses may be increased
to 5 amperes. The following are symptoms for a
blown fuse:
D
Definite Purpose Contactor pulls in but the display
remains blank. One of the following fuses has
blown. Fuse 1 (3A Slow-blo 24VDC), Fuse 2 (3A
Slow-blo 120VAC) or Fuse 4 (3A Slow-blo 24VAC)
D
Controller works but there is no belt drive motor operation. Fuse 3 (3A Slow-blo Drive Motor)
blown.
2
3
1
4
FIGURE 8
1. Remove the power supply as follows:
A.) Remove the three screw s securing t he
power supply mounting bracket to the
frame crossmember.
B.) Pull the power supply assembly/bracket
out of the unit about an inch to access the
screws on the terminal strip.
C.) Remove the two w ires from the drive motor
on the power supply terminal strip noting
which wire goes to which point on the terminal strip. If these are connected incorrectly the drive motor will run backwards.
D.) Remove the two wires supplying 120 VAC
from the 375 VA isolation transformer (located on the opposite side of the unit) to
the power supply terminal strip from the
terminal strip.
E.) Disconnect the power supply cable Molex
connector from plug J-9 on the main
board. Remove the power supply from the
unitandsetitaside.
The controller must be replaced as a set with the
following components:
D
Main board
D
Power supply board
D
Display
D
Display cable
Power Supply
Main Board
Display Cable
FIGURE 9
Drive Motor
Supply Wires
Wires from power transformer to power supply
FIGURE 10
Power supply bracket mounting screws
FIGURE 11
2 --- 7
UNIT CONTROLS
2. Remove the main board as follows:
A.) Remove all other Molex connectors from
the main board. Note which connector
goes to which pin location on the board.
Be especially careful when removing/reconnecting the two 4 pin connectors from
J-7 and J-8 which are identical in appearance and are located a djacent to each other. If these are inadvertently switched the
display will show all segments lit when the
unit is energized. No damage to the board
will result, simply cycle the power off and
then switch the connectors to the correct
plugs before re-energizing.
B.) Remove the screws securing the fuse
mounting bracket and move this out of the
way to allow the main board mounting
panel and main board to be removed as an
assembly.
Fuse mounting bracket
FIGURE 13
Plug Designations
J1 Not used
J2 Display
J3 Lift Motor
J4 Thermocouples
J5 Heating Contactors
J6 Not Used
J7 Speed Sensor
J8 Linear Potentiometer
J9 Power Supply
J10 Not Used
FIGURE 12
C.) Remove the main board by loosening, but
not removing, the three screws securing it
to the upright frame member. Remove the
screw securing it to the horizontal frame
member.
3. Remove the display board a s follows:
A.) Remove the (5) small nuts securing the
display to its stand-offs.
B.) Remove the display board.
4. Installation of the display, power supply panel,
and main board is opposite of removal. A linear
potentiometer calibration must be run following replacement of the control board. See
p a ge 5 --- 6 o f t h e P OS I T I O N C O NT R O L s e ct i o n
of this manual.
2 --- 8
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