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 24 VAC (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 the front panel. Closing the door will engage the door closed switches, sending the
voltage 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 avail-
able to the relays controlling the door lock gear motor assembly, drain valve and water valves. A continu-
ous 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. After
selecting the temperature, 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 scroll PUSH START 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 gear motor on the white/red wire from the P17 con-
nector of the relay PCB. The door lock gear motor 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.
90
Part # 8533-081-001 1/18
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