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PRINCIPLES OF OPERATION
2-8
OPERATING CHARACTERISTICS:
With the key switch in the ON position, and the bale door and feed gate closed, pressing the
AUTOCYCLE push button will cause the machine to operate one complete cycle. Pressing the
AUTOCYCLE switch closes three sets of contacts: (1) energizes Relay 1, (2) energizes Relay
2, (3) energizes the motor starter coil. With the motor running, oil is supplied to the subplate and
directional control valve. With Relay 1 energized, oil is directed to the base end of the cylinders
and causes the platen to move in the downward direction. The platen will move in the
downward direction until enough pressure is detected by the pressure switch to de-energize
Relay 1 and shift the directional control valve to direct the oil to the rod end of the cylinders and
start the platen moving in the upward direction. When the platen raises high enough to catch
and open the feed gate, the control voltage in the magnetic interlock switch is broken and
deenergizes the motor starter and the power unit shuts down. When the motor starter is
deenergized, an auxiliary contact de-energizes Relay 2.
When Relay 2 energizes, a contact is closed to start Timer 1. Timer 1 is used to shut the power
unit down if the pressure switch never opens by either: (1) not enough pressure, or (2) by
malfunction. Timer 1 sets at 50 seconds. If Timer 1 times out, Relay 2 is de-energized which
deenergizes the motor starter coil. When the motor starter is de-energized, it also de-energizes
Relay 1, and the power unit shuts down.
When enough material has been compacted in the bale chamber to stop the platen while
holding the limit switch in the open position, and the pressure switch actuates, Relay 2 will
deenergize. When Relay 2 de-energizes, the motor starter coil will de-energize, the power unit
will shut down, and the BALE MADE LIGHT will come on.
NOTE: When the BALE MADE LIGHT comes on, it is time to tie the bale. See Bale Tie Off
instructions on page 1-7.
2 MAINTENANCE