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A modular basket lift consists of a toothed rod to which the basket lift arm is attached, a reversible-
drive gear motor, and a pair of roller activated microswitches. The gear motor engages the teeth in
the rod, moving it up or down depending upon the direction of rotation of the motor. Microswitches
at the upper and lower limits of movement stop the motor when the basket is in the full up or full
down position and also reverse the direction of current flow thus reversing the motor direction.
When the manually set or programmed cooking time has elapsed, current is again supplied to the
basket lift and the basket is raised.
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 computers, the process is
almost identical. The difference is that the push button mechanical timer is replaced with timing cir-
cuitry 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 cir-
cuitry activates a coil in the basket lift relay to supply power to the lower microswitch. As with the
manually 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.
Problems with the basket lift system can be grouped into three categories:
• Binding/jamming problems
• Motor and gear problems
• Electronics problems
M
2-Pole
Mech
Timer
HN
N.O.
Upper Limit
Microswitch
N.C.
Lower Limit
Microswitch
4 or 6
3
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.
1 or 5
Manual (Push-Button)
Modular Basket Lift Simplified Schematic
M
HN
N.O.
Upper Limit
Microswitch
N.C.
Lower Limit
Microswitch
6
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.
Computer/Controller
Modular Basket Lift Simplified Schematic
To computer/controller
via interface board
Basket Lift
Relay
3
1 or 4
5