Technical_reference.pdf - 第44页

Technical Service Manual 44 Revision Dat e: August 2004 BOTT OM CELL MO TOR REM OVAL 1. If the Oven is belt-only, disconnect t he belt at t he master link and unthread t he belt fr om the tunnel. See the procedure f or d…

Technical Service Manual 43 Revision Date: August 2004

CELL FAN ASSEMBLY REMOVE AND REPLACE PROCEDURES

CAUTION:

BEFORE STARTING ANY MAINTENANCE, DISCONNECT THE

OVEN FROM ALL POWER SOURCES.

TOOLS AND MATERIALS REQUIRED:

RTV SS986 silicone sealer.

Cleaning solvent or Isopropyl alcohol.

Clean rags.

Putty knifes 3" wide & 1" wide.

Razor scrapers.

1/8" tip, 4" long, flat bladed screwdriver.

#2 cross head, 8-10" long, screwdriver.

1/8" hex key T-handle or 1/8" hex key bit for impact wrench.

5/32" hex key T-handle or 5/32" hex key bit for impact wrench.

Impact wrench.

Torque wrench calibrated in inch pounds with a range exceeding 50 inch pounds (click type).

(2) 11/32" open end wrenches 1/8" or less in thickness.

.090" Fan mounting gauge.

A 10" 4x4 block of wood

1/8” tubing

Paper and pencil.

Make a clear sketch of the Inter Cell Baffle (ICB) settings for all cells. The ICBs will be removed and replaced

during this procedure.

1 Remove the oven sheet metal skin(s) to gain access to the cell fans.

2 At the front of the Oven open the Hood with the hood up switch. Make sure that the 'hood' is in the

fully open position. NOTE: watch the overhead clearance and exhaust duct movement while raising

the Hood.

Motors and Fans MUST NOT be separated or mixed up, be sure to match up the serial numbers on both

components. The motor/ fan units are dynamically balanced and MUST remain together.

Technical Service Manual 44 Revision Date: August 2004

BOTTOM CELL MOTOR REMOVAL

If the Oven is belt-only, disconnect the belt at the master link and unthread the belt from the tunnel.

See the procedure for disconnecting the conveyor belt.

2. If the Oven is rail-only, disconnect the conveyor chains at the master links and unthread them from the

tunnel. See the procedure for disconnecting rails and chains.

3. If the Oven has a combination rail/belt conveyor, disconnect and unthread the chains first and then the

belt from the tunnel. See the procedures for disconnecting rails and chains and disconnecting the

conveyor belt.

4. Remove all outer panels to allow access to the underside of the Oven. Remove power from the Oven.

5. Remove the screw(s) holding the thermocouple(s) in place on the cell face. Using a permanent black

marker, circle the hole the thermocouple(s) pass through on the heater face. Carefully straighten the

thermocouple wire and cover it with a piece of 1/8" vinyl tubing. This is to aid relocating the

thermocouple when reassembling the cell.

6. Remove the four Philips style screws holding each ICB in place on the sides of the heater panel.

Remove the ICBs.

7. Remove the three Philips style screws holding the front heater panel bracket. Remove the bracket.

8. Using a hex head wrench, carefully insert the short end into a hole in the heater panel and gently pull

up on the heater panel. Use the 3" putty knife to push the insulation guard clear of the heater panel.

9. Tip the heater panel on its side to gain access to the heater wires on the inside of the cell. Block the

panel in place to remove the heater wires.

10. SKETCH the wire placement on the connections on the heater panel. They will have to be replaced in

the same order.

11. Remove the four wires by using two 11/32" wrenches. Uses one to hold the bottom nut (closest to the

panel) steady, while the other unscrews the top nut to free the wire.

IT IS VERY IMPORTANT TO USE TWO WRENCHES AND HOLD THE BOTTOM NUT STEADY BECAUSE THE

HEATER FOIL IS DIRECTLY ATTACHED TO THE STUD AT THIS LOCATION. THE CERAMIC BLOCKS ARE

FRAGILE AND EASILY BROKEN. IF THE HEATER FOIL TEARS, IT CANNOT BE REPAIRED, AND THE HEATER

PANEL ASSEMBLY MUST BE REPLACED.

12.

Disconnect the thermal switch, then remove the heater panel and set it aside.

13. Remove the blower from the motor shaft. Using a 1/8" hex head wrench, loosen the two setscrews on

the blower enough to remove the blower from the motor shaft. Save the blower to return with the

motor.

14. Go to the rear of the oven and go in under the cell that has the motor to be removed. Document the

locations of the wires in the terminal block. Using a 5/32" hex head wrench or T-handle, carefully

remove the three screws holding the motor in place on the cell.

CAUTION: Hold the motor with one hand while you remove the last screw as the weight of the motor

may cause it to fall on top of you.

15. Remove the Cell Fan motor. You may have to tap on the motor to break it loose from its mount on the

cell.

16. Scrape all RTV off the cell in the motor area. Clean all grease, dirt and RTV from the shaft hole area

and the motor support areas.

Technical Service Manual 45 Revision Date: August 2004

BOTTOM CELL MOTOR REPLACEMENT

1. Under the rear of the oven, locate the cell where the motor is to be installed.

2. Assemble three screw assemblies. A screw assembly consists of one 5/32" hex head screw, one flat washer, and

one rubber washer in that order. The rubber washers are to aid in vibration isolation.

3. Using RTV, put a very small dab on each support leg of the motor. Place one rubber washer (not the rubber

washer from the screw assembly in Item 2 above) on the bottom of each motor leg and position them so they are

centered on the screw holes.

4. Put a small amount of RTV into each of the fan mounting holes on the cell plate.

5. Insert one screw assembly into a hole on the motor base and place the motor up against the cell face. CAUTION:

Orient the motor so the wires will reach the terminal block. Center the holes and hand-start the screw.

Tighten it until it is snug.

6. Insert the second screw into a hole on the motor base and hand start it. Tighten it until it is snug.

7. Finally, insert the last motor mounting screw into the last hole and hand start it. Tighten it until it is snug.

8. Using the 5/32" T-handle, tighten all three screws until they are tight and the motor is securely fastened onto the

cell plate.

9. Properly connect the motor wires to the connector block. (Red=L2, Yellow=L3, Blue=L1)

10. Place the fan mounting gauge on the cell on the cell face with the opening of the V facing the rear of the oven and

surrounding the motor shaft. Make sure that the sides of the gauge are between the screws in the cell plate. See

drawing of the fan gauge.

11. Place the matching fan blade onto the motor shaft of the motor just installed. Note that the fan has two setscrews

and the motor shaft has two flats on it.

12. With the fan blade resting on the gauge, tighten the setscrews with a 1/8" hex head bit on a torque wrench set to

50 inch pounds. Remove the gauge by sliding it forward and lifting it out of the cell.

13. Retrieve the heater panel for this cell and lay it into place in the cell. Be careful not to bend the thermocouple wire.

Prop the heater panel up from the front so the heater wires can be reconnected.

14. Reconnect the wires to the panel referring to the SKETCH made when the panel and wires were removed. Use

two 11/32" wrenches to prevent breaking the ceramic block or tear the foil connected to the lower (closest to the

panel) nut on the stud. Reconnect the thermal switch.

15. Carefully place the thermocouple wire in its protective 1/8" vinyl tubing through the correct hole in the panel. If the

thermocouple(s) was NOT marked (circled) before removing the panel, then count three rows from the right and

seven holes from the front to locate the correct hole. If the Oven has the Independent Alarm Scanner (IAS) over-

temperature sensing option, refer to the SKETCH to locate the second thermocouple.

16. After the thermocouples are located in their proper holes, lower the heater panel in place. Remove the vinyl tubing

from the thermocouple(s).

17. Replace the front panel bracket and fasten it down with two Philips type screws. Replace the rear heater panel

bracket and fasten it down with two screws.

18. Replace the left and right ICBs and fasten them down with two Philips type screws each. Refer to your drawing of

ICB placement to adjust them.

19. Carefully bend the thermocouple probes into the proper position under the hold down clamps, and tighten the

clamps screws.(Do NOT use longer screws, they will damage the heater panel)

20. Reconnect the conveyor system. See the procedures for reconnecting rails and chains and reconnecting the belt.