Marathon Computer V-4224 installation manual Principles of Operation, Operating Characteristics

2 MAINTENANCE

PRINCIPLES OF OPERATION

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.

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