Electrical Path Circuit Schematics
Start Circuit
Power travels into the machine on L1 & L2 & (L3, if 3 phase used). L1 and L2 provide 208- 240VAC to
the controls transformer which steps the voltage down to 120VAC for the controls. (The L1 connec-
tion at the controls transformer must be checked at start-up to coincide with machine operating voltage)
The 120VAC travels out from the transformer on either [X-1 red wire directly to the 1.5 amp fuse] or [X-1
black/red wire to TB-4 and then through the red wire to the 1.5 amp fuse]. The controls transformer also
creates a neutral on the X-2 black/blue wire that connects to TB-1. From the fuse holder, 120VAC travels
on the red wire to the #6 terminal on the terminal strip and then through the black wire to another step-
down transformer. From the terminal strip the blue wire will provide the neutral for solenoid, thermoactua-
tors and all valves. The white wire provides the neutral from the terminal to the step down transformer.
120VAC is stepped down to 2.3VAC (blue wires), 24VAC (red wires), and a yellow center tap wire to the
P-7 power connection on the main controller PCB . With the main control PCB now powered, 5VDC will be
present between the (2) yellow wires and also the (2) brown wires for the coin switches. Both pairs will
now be ready to count coins through the P-2 connection at the control PCB. 26.8 VAC goes out on the
black wire of the P-4 connection from the main control PCB to the S5 door closed switch which mounted
on the hinge side of masking ring. Closing the door will engage the door closed switches, sending the volt-
age to the red wire on the S1 door latched switch. Turning the door handle to the vertical latched position
closes the S1 door latched switch, returning the voltage to the main control PCB on the white/red wire at
the P-4 connection. 26.8VAC is now present at the S2 and S3 door locked switches.
26.8VDC is also at the black and white wires between P-21 at the main control PCB and the P-20 of the
relay PCB. This voltage signals the relay PCB that the door is closed and latched making 120VAC available
to the relays controlling the door lock solenoid, drain valve and water valves. A continuous 5VDC is sent
on the red wire from the P-1 connector on the main control PCB, through the (normally closed) emergency
stop button switch and returns on the second red wire back to the P-1 connector. Payment is added and
the display counts down on the main control PCB display until the vend price is satised. The display will
change to read PUSH and the green light over the start button will ash. Pressing the start button on the
front of the main control PCB signals the relay PCB to lock the door and 120VAC will go to the door lock
solenoid on the white/red wire from the P17 connector of the relay PCB. The door lock solenoid engages
and pulls up on the door locking rod, locking the door and closing the S2 and S3 door locking switches.
The S2 locking switch is a backup to the S1 latching switch so that once the cycle starts the S1 isn’t criti-
cal. The S3 locking switch provides 26.8VDC on the orange wire back to P4 connector at the main control
PCB and the P15 connector at the relay PCB. This signals that the loading door is closed,locked and safe
to continue wash operations. This activates the P-13 and P-14 yellow enable wires to the inverter drive to
allow motion. If there is no signal on P-15 (orange wire) their will be no motion of the tub. S1, S2, S3 and
S5 door switches are now closed . The green On LED and the door lock solenoid (discussed in start circuit)
will remain on throughout the cycle.
Fill Circuit-Warm
The relay PCB supplies 120VAC to the brown/yellow wire from P-17 to the drain valve which closes the
valve. The lock thermoactuator also receives 120VAC on orange/blue from P17 of the relay PCB. This
device prevents the door lock solenoid from dropping out and unlocking during the cycle in the event of a
power loss. The 120VAC will cycle on and o keeping the lock thermoactuator engaged until 70 seconds
before the end of the cycle. The main control PCB sends data commands to the VFD through the data
cable connected at P-6. These commands control the wash basket which will tumble one direction for 12
seconds, pause, and then reverse direction for 12 seconds.
The prewash or wash LED will illuminate at this time, powered through the white wires from the P-3 con-
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Part # 8533-072-001 3/22
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Part # 8533-072-001 3/22
Section 7:
Electrical
Wiring Diagrams &
Schematics
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