Entron EN1000 series

Page 120 • 700120S • ENTRON Controls, LLC.
TIMING CHART ANALYSIS
Detailed sequencing of the cylinder can be better understood by studying sequence timing
charts (see Figure 9-15) which are discussed in the following sections.
Section A
Section A details a basic sequence and how it may begin. The blocking valve may be on or off
and will be cleared by an Emergency Stop. FS3 is then initiated and schedule 00 is started.
Since the blocking valve is off, the sequence begins with SQUEEZE DELAY (if programmed)
and then proceeds into SQUEEZE time (EXTEND). A VALVE MODE of
0101
0101
01 is selected to turn
on Valve 1 only. Schedule 00 is CHAINED to schedule 01. Schedule 01 begins and enters into
SQUEEZE time (INTENSIFY), WELD time, and HOLD time. A VALVE MODE of
0303
0303
03 is selected
to enable both Valve 1 (extend) and Valve 2 (intensify). After HOLD time is complete, the
BLOCKING DELAY (if programmed) begins. When this DELAY is complete, Valve 3 (blocking)
turns on. The control then waits for the next initiation, leaving the blocking valve on.
Section B
Section B is the same as Section A but, since Valve 3 (blocking) is on, the sequence skips
SQUEEZE DELAY and immediately begins schedule 00 with SQUEEZE time (EXTEND).
Section C
Section C illustrates how a sequence can be terminated by an Emergency Stop. When the
Emergency Stop is detected, the sequence is aborted and all valves and weld output are turned
off. As can be seen, when the Emergency Stop is closed, the blocking valve is not turned back
on.
Section D
Section D shows a single sequence similar to Section A, followed by a REPEAT sequence.
Since OFF time is less than BLOCKING time, the sequence will REPEAT when the BLOCKING
time has ended.
Section E
Section E illustrates that different schedules may be selected having common SQUEEZE DELAY
and BLOCKING times.
Section F
Section F shows how a momentary switch attached to FS1 can toggle the gun from retracted to
non-retracted mode or vice-versa. After a momentary closure of FS1, SQUEEZE DELAY is
followed by ADVANCE STOP before BLOCKING occurs.
Air Over Oil Retraction is only available in PROM firmware version 619016-002G (or later)
for EN1000 or EN1001 Series Controls.
9.5.3 AIR OVER OIL RETRACTION OPERATION –
PP
PP
P
.O..O.
.O..O.
.O.=
0707
0707
07 (cont.)