Frymaster 47 SERIES Installation, Operation, Service, And Parts Manual page 83

Manual (Push-Button)
Modular Basket Lift Simplified Schematic
2-Pole
H
Mech
Timer
1 or 5
4 or 6
When the timer button is pushed, the lower circuit is activated,
causing the basket lift to be lowered, closing the normally open
upper microswitch. When the lower normally closed microswitch
is opened by the downward moving basket lift rod, power to the
motor is cut. When the timer times-out, the upper circuit is
activated, causing the basket lift to be raised, reclosing the lower
microswitch. When the basket lift rod clears the upper
micorswitch, allowing it to reopen, power to the circuit is cut and
the motor stops. Pushing the timer button again restarts the
cycle.
When the timer times-out, power is supplied
to the opposite pole of the motor through the
upper microswitch. The motor drives the rod
upward until it loses contact with the upper
microswitch, cutting power to the motor and
stopping the lift.
In units configured for Basket Lift Timer
Controllers or Computer Magic III computers,
the process is almost identical. The difference
is that the push button mechanical timer is re-
placed with timing circuitry in the computer or
controller. The specific cook times (and other
settings) are programmed into the computer or
controller by the operator. When the product
button is pressed, the timing circuitry activates
a coil in the basket lift relay to supply power
to the lower microswitch. As with the manu-
ally controlled units, the microswitches stop
the motor at the lift's upper and lower travel
limits and reverse the direction of current flow
thus reversing the motor direction.
47 SERIES GAS FRYERS
CHAPTER 7: SERVICE PROCEDURES
N
N.O.
Upper Limit
Microswitch
M
3
N.C.
Lower Limit
Microswitch
Computer/Controller
Modular Basket Lift Simplified Schematic
H
5
1 or 4
Basket Lift
3
Relay
To computer/controller
via interface board
When the product button is pushed on the computer/controller,
current flows through a coil in the basket lift relay, causing the
lower circuit to be activated. This causes the basket lift to be
lowered, closing the normally open upper microswitch. When the
lower normally closed microswitch is opened by the downward
moving basket lift rod, power to the motor is cut. When the
computer/controller times-out, the current to the relay coil is cut,
allowing the upper circuit to be activated. This causes the basket
lift to be raised, reclosing the lower microswitch. When the
basket lift rod clears the upper micorswitch, allowing it to reopen,
power to the circuit is cut and the motor stops. Pushing the
product button again restarts the cycle.
Problems with the basket lift system can be
grouped into three categories:
• Binding/jamming problems
• Motor and gear problems
• Electronics problems
BINDING/JAMMING PROBLEMS
Noisy, jerky or erratic movement of the lifts is
usually due to lack of lubrication of the rods
and their bushings. Apply a light coat of Lu-
briplate™ or similar lightweight white grease
to the rod and bushings to correct the problem.
Another possible cause of binding is improper
positioning of the motor, which prevents the
gear from correctly engaging the teeth in the
rod. To correct the problem, loosen the screws
that hold the motor in place and move it
forward or backward until the rod has just
enough slack to be rotated slightly.
7-24
N
N.O.
Upper Limit
Microswitch
M
6
N.C.
Lower Limit
Microswitch