TM 5-3610-253-14
Table 5-3. SYSTEM OPERATION SEQUENCES - Cont
Sequence
Basic Operation
Step
Circuit/Component Operation
Knife at bottom of its stroke - Cont
c.
Locking of clamp pressure: With the light barrier
de-energized, N.O. contractors of d37 open, the 24 V
is lost to relay d310, this will open the
contractors d311 and d310 for the conical valve m315.
N.O. contractors of d314 will be open because of the
gear limit switches b22a and b now open. This will
de-energize relay d312 and its N.O. contractors will
open. During this time, +24 V is being sent to
the RC network of relay d313 to charge the
capacitor.
Knife reaches top of its stroke.
a.
De-energize the clutch ball valve: N.O. contractors
b22a and b22b of the gear limit switches are again
open. This removes +24 V from relays d21a, d21b
V from clutch ball valve solenoid m27.
b. Releasing Clamp: N.C. contractors of gear limit
switches b22a and b are now closed again. This
allows relay d314 to energize again. Relay d313
will energize for 0.5 seconds because of the stored
charge on the capacitor. This will allow relay d312
to energize, and it will remain energized because of
its own contactor and the fact that the clamp is
down, also allowing the N.O. contactor b29 to be
closed. With d311 de-energized, and d312 energized,
+42 V is again applied to solenoid m315.
5
Releasing the cutting buttons.
a.
Reset relay d230 and d230 a and b: With the cutting
buttons released, N.C. contractors b28a and b28b are
closed. This will allow +24 V through the
contractors d37, b22a and b22b. This will energize
d230. With relay d230 energized, relays d230a and b
are allowed to energize. This turns the emitter
lamps in the light barrier on again and allows relay
d37 to re-energize. Relay d38 is also re-energized.
5-29
