TM 5-3610-253-14
Table 5-3. SYSTEM OPERATION SEQUENCES - Cont
Sequence
Basic Operation
Step
Circuit/Component Operation
Step on foot pedal.
+24 V goes through limit switches b22a and b22b
N.C. contacts. This energizes relay d314. This
allows +24 V to pass through the N.O. contacts of
the foot pedal switch b309. This allows relay d312
to energize through N.C. contacts of d311. With d312
energized and d311 de-energized, this allows +42 V
to energize m315, the conical valve, and allow
hydraulics to lower the clamp.
Pressing both cutting buttons.
a.
Light barrier is tested. This is done by: the N.O.
contacts b28a and b28b (cutting buttons) sendinq +24
V through contractors d305 (0.5 sec limitati on
relay for cutting buttons). This +24 V is sent
to the light barrier circuits. (This will also,
through other circuits, cause relay d38 to de-
energize.) This will send a pulse through
the light emitters. This will de-energize the
emitters momentarily. This will momentaril y re-
energize relay d37. If d31 does not momentarily de-
energize, relay d230 will de-energize (the non-
repeat relay). During this test, relay d230 will
remain energized because of a 100pF capacitor
holding a charge.
b.
Energizing the safety bolt solenoid. +24 V is
applied to relay d1. This allows relay d2 to
energize. With relay d2 energized and d3 de-
energized, this will allow the safety bolt solenoid
M.SB to energize, extracting the safety bolt. This
allows relay d5 to energize because of the N.O.
contactor of b.SB, now closed.
5-27
