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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 connection 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 trans-
former. From the terminal strip the blue wire will provide the neutral for gear motor, thermoactuators 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 posi-
tion 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 re-
lay PCB. This voltage signals the relay PCB that the door is closed and latched making 120VAC available to
the relays controlling the door lock gear motor assembly, 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. After select-
ing the temperature, payment is added and the display counts down on the main control PCB display until
the vend price is satisfied. The display will change to scroll PUSH START and the green light over the start
button will flash. 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 connec-
tor 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 gear motor (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 gear motor from dropping out and unlocking during the cycle in the event of
a power loss. The 120VAC will cycle on and off 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.
100
Part # 8533-114-001 8/21
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Table of Contents
Troubleshooting
