Circuit Schematics
Start Circuit
Power travels into the machine on L1 & L2 & (L3) ( if 3 phase used). 208- 240VAC goes to
a Control Transformer ( must be checked at start -up to coincide with machine operating
voltage) that steps the voltage down to 115VAC for the controls. 115VAC then travels from the
transformer out on [X-1 red wire to the (fuse)] or [ X-1 blk/red wire] to TB-4 then to the red wire
to the fuse, (fuse in fuseholder). X-2 Blk/blu wire is the neutral side of the transformer.
From the Fuse holder, 115VAC travels on the red wire to the #5 terminal on the terminal strip
and then on the black wire to the Step-Down Transformer where it is stepped down to 2.3 VAC
and 24 VAC that proceeds to the P 7 connection to power the micro-controller PCB. The Door
must be closed to satisfy the door closed switch mounted on masking ring at front door. With
data going out from front main PCB on the black wire through door closed switch and red wire
out of door closed switch and over to door latched switch to await start button being pressed.
Main PCB is satisfi ed and a 5 VDC signal is sent out of P4 connection on the white/red to
the S1 door switch. With the S1 door switch closed 5 VDC is now on the red wire at the P4
connector of the micro-controlled PCB and a 115VAC signal will go to the Door Lock Solenoid
from the P17 connector of the Main Relay PCB on the white/red wire.The Door Lock Solenoid
pulls in, locking the door and closing the S2 and S3 Switches. The S2 Switch is a backup to
the S1 Switch so that the adjustment on S1 isn’t as critical. The S3 Switch provides 5 VDC on
the org. wire back to P4 connector at micro-controlled PCB and P15 connector at the main
relay PCB to know the loading door is closed and locked. Org. wire @ P15 turns on the enable
to the drive to allow motion. With no signal on P15 (org. wire) their will be no motion of the tub.
The black wire and white wire between Front controller PCB P21 and the main relay PCB P
20 is where door lock data is supplied to indicate door closed and locked to relay PCB and
allows 120 volts to pass through relays to drain valve and water valves. The blue wire from the
terminal strip will provide the 115 VAC neutral for solenoid, thermoactuators and all valves and
the white wire from the terminal to the step down transformer.
Machine Electrical & Wiring Schematics
60
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