TM 5-6675-315-14
Table 2-2. CONTROL SYSTEM CIRCUIT SWITCHING SEQUENCE
NOTE
Refer to wiring diagram, FO-2 and FO-3, when reading this description.
OPERATOR ACTION
STEP CIRCUIT OPERATION
TURNING KEY SWITCH ST ON.
Power is input to control system through safety switch eBA. Cutter on lamp KLS lights. No relays energize
because controlling switches are open.
TURNING CUTTER FORWARD SWITCH VT ON.
1.
Power flows through closed leg of cutter REVERSE switch RT and rear safety switch SSS to energize
cutter forward relay SV. Power also flows through HE0 to energize timer relay ZR.
NOTE
HE0 is kept closed by trip dogs on press ram when ram is in start position. This enables
operation of ZR.
2.
Energized SV closes holding contacts 54-53. Power now has two paths to SV through centrifugal switch FL
and HE1-A limit switch.
3.
After preset time delay (to allow bale chamber to fill with material), ZR energizes, closing contacts 67-68.
Timer X contacts 32-31 are closed, so solenoid valve MW and pump motor relay MP energize.
4.
MW controls four-way spool valve directing fluid flow to ram. MP starts hydraulic pump motor, closes
contacts 14-13. Press ram moves forward.
5.
Trip dog pressing HE1 clears. HE1-B limit switch and MP 13-14 provide holding circuit for MP and MW.
NC side of HE1 opens, reducing flow paths to relay SV to one.
NOTE
Opening one side of HE1 enables operation of FL. Closing NO side enables operation of press
safety switch SSP.
2-12
