Insinger USN-72 Technical Manual page 71

Part 5: BASIC SERVICE
5.3
Component Repair and Replacement
(Cont.)
5.3.20 Control Circuit Explanation (Cont.)
INITIAL STATE OF THE MACHINE
Doors open
Power off
Tanks empty
Booster full of water
End of cycle
THEORY OF OPERATION
The days first operation should find the machine in the above condition. The operator is to then
fill the machine through the manual ball valves to the specified level suitable for operation. At
this point the machines power switch, SW, can be turned to the "ON' position.
1 .)
THE
"CB" CIRCUIT BREAKER
The purpose of this device is to limit the machines control current and is rated for 5A. The
normal state of this device is closed. When the control circuit has a current fault the breaker will
open, the button on the face of the breaker will push out, and shut down the machines operation.
It is reset by pushing the button on the face back in.
2.) THE "SW" POWER SWITCH
The purpose of this device is to turn the machine on and off. In the "ON' position, the switch
passes power from the circuit breaker, CB, to wire #3. With the switch "ON" the power on light,
"PL",
will illuminate. Wire #3 is the controlling voltage that allows other devices to operate with
no other conditions satisfied other than the power being on. These devices include:
A.)
m.
The relay 1CR monitors the state of the door switches.
If
either the wash or rinse tank
door is open the relay will not energize. Contacts on this relay prohibit the pumps and conveyor
from running when the doors are open, they prohibit the final rinse valve from energizing with
the doors open, and prohibit the steam coils from energizing with the doors open.
B.) WFSW The device WFSW is the wash tank float switch. When the wash tank is empty the
magnet in the float causes a reed switch in the stem to close. This energizes the wash tank float
switch relay, 6CR.
C.) RFSW The device RFSW is the rinse tank float switch. When the rinse tank is empty the
magnet in the float causes a reed switch
in
the stem to close. This energizes the rinse tank float
switch relay, 7 C X .
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