Technical_reference - 第70页
Technical Service Manual 70 Revision Dat e: August 2004 RECONNECTING T HE CONVEYOR BELT 1 Retrieve the single m aster link previous ly rem oved. Hold the m aster link so that the opening f aces you and the curve in the l…
Technical Service Manual 69 Revision Date: August 2004
CONVEYOR BELT, CHAIN & RAIL SERVICE
REMOVE AND REPLACE CONVEYOR BELT
DISCONNECTING THE CONVEYOR BELT
1. Locate the master link in the belt. The master link can be identified by the double size 'holes' in the belt. There will be
two double size holes located at the fourth link in from each end. There are five master links in the belt. The single lane
master link is the center link on the belt. The conveyor will have a belt with five single master links. (instead of two triples
and one single master link).
2. At the right side of the belt, locate the master link. Using screwdriver or chain nose pliers, unhook the left hook of this
master link from the belt. Then, using the same tool, unhook the right hook of the master link from the belt.
3. Using a screwdriver, lift the left side of the master link out of its position in the fourth link from the end on the oven side
of the belt. Using a screwdriver, unhook the right side of the master link from the belt.
4. Locate the triple master link on the left side of the belt. Using screwdriver or chain nose pliers, unhook the right hook
of this master link from the belt. Now using the same tool, unhook the left hook of the master link from belt.
5. Using a screwdriver, lift the right side of the master link out. Using a screwdriver, unhook the left side of the master
link from belt.
6. Squeeze the ends of the triple master link together and slide the master link ends out of the oven side of the second
link in from the end.
7. At the right side of the belt, squeeze the ends of the triple master link together and slide the master link ends out of the
oven side of the second link in from the end.
8. The triple master links will stay in this position to reassemble the conveyor belt. Carefully lower the bottom end of the
conveyor belt taking care not to let it get caught anywhere
9. At the center of the belt, using a screwdriver, unhook the right side of the single link. Lift the unhooked side up and
remove the single master link from the belt. The belt will now separate. Unhook the bottom edge of the belt from the
driven shaft and lay it on the floor under the oven.
NOTE: Use only single links for replacement.
Technical Service Manual 70 Revision Date: August 2004
RECONNECTING THE CONVEYOR BELT
1 Retrieve the single master link previously removed. Hold the master link so that the opening faces you
and the curve in the link matches the curve in the belt. Insert the link into the belt so the hooks go into the
two links surrounding the center link.
2 Hook the right hook into the center link of the bottom belt edge. Push the link back into place and using a
screwdriver, connect the left hook to the center link of the bottom belt edge.
3 Grasp a triple link and squeeze it into a U shape. While holding this shape, slide the ends of the triple
master link into the belt. Release the ends of the master link.
4 Grasp the other triple master link and squeeze it into a U shape. While holding the U shape, slide the
ends of the master link into the belt. The master links should now be connecting the two belt ends.
5 At the right side of the belt, using a screwdriver, hook the master link right hook into the last hook of the
belt (insert the master link hook from the top). Then using a screwdriver connect the master link right
hook into the first link on the bottom edge of the belt.
6 Using a screwdriver slide the left side of the same master link into the belt. Then, using the screwdriver,
connect the left master link hook to the belt, inserting the hook from the underside of the belt.
7 At the left side of the belt, using a screwdriver, hook the master link left hook into the last hook on the belt
(insert the master link hook from the top). Then using a screwdriver connect the master link left hook to
the belt.
8 Using a screwdriver, slide the right side of the same master link into the belt. Then, using the
screwdriver, connect the right master link hook to the belt, inserting the hook from the underside of the
belt.
End of procedure.
Technical Service Manual 71 Revision Date: August 2004
DC DRIVE CALIBRATION
1. Definitions-
A DC drive is actually a DC voltage amplifier. A small signal is sent to the drive and a large voltage is sent to the
motor. The typical DC drive uses an AC power source of 120 or 240 volts.
The set of controls found on a DC drive is:
A. Minimum speed adjust
B. Maximum speed adjust
C. IR comp
D. Torque
E. Signal
2. What do the controls do?
A. Minimum speed adjust -- adjusts the minimum voltage output of the DC drive at the minimum-input value.
This value is typically 0 - 10% of the maximum input voltage.
B. Maximum speed adjust -- adjusts the maximum voltage output of the DC drive at the maximum input
value. An experienced individual might set the input voltage to 100% of range and set the output to 80 -
90 volts. When in doubt, set the maximum output of the DC drive to 100 - 130 volts.
C. IR comp -- this adjusts the feedback circuit from the output of the DC drive. If the output voltage drops,
the IR comp circuit senses the drop, and more power is fed to the motor. This function is preset to a
value that covers 90% of all applications.
D. Torque -- this limits output current, and should only be adjusted by experienced people.
G. Signal -- signal adjust is found on DC drives which provide an option of being controlled by a computer. If
the DC drive is adjusted by a speed control potentiometer, signal or signal adjust has no function.
A DC drive with computer control will have a signal/manual selector switch or jumper. If the input does
not match the input selected, the DC drive will not operate correctly.
If a computer controls the DC drive, the maximum adjustment potentiometer will have no function.
3. How to make adjustments
The output of a DC drive is linear. The speed of rotation of a permanent magnet DC motor of less than one half
horsepower is not.
Install the new DC drive and operate the conveyor for one half-hour. This warms up the components on the DC
drive and the motor. Calibrating before a one half-hour warm up period will require a second calibration.
A. Set the input of the DC drive to 0%. Use the minimum speed adjustment to establish the minimum
speed at 1 to 2 inches per minute. Most systems will require a minimum of 5 to 7 inches per minute.
B. Set the input of the DC drive to 100%. Set the output voltage to the motor to 90 volts. Experienced
people may set the output to a higher or lower value.
Initially set the “IR comp” at 12 O’clock, “Torque” at 10 O’clock, “Min Speed” at 10 O’clock, “Max
Speed” = Off, and “Signal Adj.” at 12 O’clock to begin.
4. Additional useful information
A. Always recalibrate when any component of a control system is changed.