Operations and Maintenance Manual Power Distribution
Version 1.2 - June 2004 6 - 5
POWER UP
Refer to the engineering drawings for the following description of power up circuitry.
The basic functions of the power up circuit are to maintain closure of circuit paths
1L1, 1L2, and 1L3 after the Machine On pushbutton is depressed and to break the
circuit path if a "fault" is sensed. To maintain the circuit path means to "hold down"
the main contactor, 1CON. When the Machine On button is depressed, a set of
contacts is closed, and the solenoid of 1CON is energized. When the solenoid of
1CON is energized, it closes the contacts for 1L1, 1L2, and 1L3, providing power
throughout the machine.
A fault occurs if a single service door interlock (see Interlock section) is open or if the
user depresses either of the two Emergency Off pushbuttons (EMO). The Emergency
Off pushbuttons are the Main Control Panel EMO and the Rear EMO. When a fault
occurs, power is removed from the main contactor's solenoid, and the contacts for the
three arterial power lines, 1L1, 1L2, and 1L3 and for terminals 13 and 14, are opened,
removing power from throughout the machine.
To Next Page
Loading...
