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© Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT
Operation
F232183
10
Theory of Operation
The design of the machine emphasizes performance
reliability and long service life. The cylinder, shell,
and main body panels are fabricated of stainless steel.
The cylinder is driven by a belt-drive system supported
via the shaft by two flange-mounted spherical roller
bearings bolted to the A-frame. The UW35 uses a
trunion.
The machine uses one motor to drive the cylinder via a
V-belt drive in all speeds.
A door-lock system prevents opening of the stainless
steel door when water is in the machine. It also
prevents operation of the machine when the door is
open.
Electrically operated drain valves are used to retain the
water and wash solution in the machine during the
wash and fill steps. The drain valve closes when power
is applied and opens when power is removed, allowing
the machine to drain in the event of a power failure.
The cylinder is designed with lifters or ribs that lift the
garments from the wash solution when the cylinder
rotates at slow speed and allow the garments to tumble
back into the solution. The cylinder is perforated,
allowing the water to pass through and drain from
within during the wash process and extract.
Electrical controls for the machine are housed in a
separate enclosure located underneath the top cover of
the machine.
There are two possible load balance systems, the “AC
Inverter Drive Balance Detection” and the “Vibration
Safety Switch.”
The balance detection system using the vibration
safety switch does not rely on the AC inverter drive
and does not attempt to balance the load in a drain
step. As the cylinder is spinning at the programmed
speed, if the wash load becomes unbalanced, the
overtravel limit switch is “tripped” causing the
cylinder to slow to a stop. The remaining portion of the
cycle is aborted.
The balance detection system using the AC inverter
drive uses special balance detection software in
conjunction with the V-computer to prevent out-of-
balance conditions. When the AC drive detects an
unbalanced load during the drain step, the computer
will make up to three attempts to balance the load.
After the third try the machine spins at a safe speed up
to 106 G. As a fail-safe measure, a vibration safety
switch is installed.
The machine uses an AC inverter drive control which
provides five motor speeds using a single motor. The
solid state output board converts motor logic from the
V-computer to the correct signals for the AC inverter
drive.
The operator can select from among 30 cycles. A
special permanent test cycle can be selected to verify
proper operation of the machine.
Liquid supplies can be injected directly into the cups
by a customer-supplied external chemical supply
system. Five hose strain reliefs on top of the supply
dispenser facilitate connection to an external supply
system. A terminal strip inside a panel on the rear of
the control module provides connection points for
external supply signals.
V-Computer
The V-computer control is a programmable solid-state
control capable of storing and running up to 30 cycles.
A detailed description of these cycles can be found in
the Programming section of this manual.
If this machine’s computer has been equipped with
special preprogrammed cycles, a separate insert listing
these cycles has been included in the resealable plastic
bag which contained this manual.
NOTE: Never turn the power off while the
computer mode switch is in the Program position.
Such action will disorder portions of the
programmed data, necessitating reprogramming of
some or all of the existing cycles. Always return the
mode switch to Run position before turning the
power off. Refer to the Programming Manual.