Entron EN1000 series, Инструкция по установке и эксплуатации, Страница: 111 / 131

Page 109
Figure 9.5.2 Oil over Oil retraction diagrams
TIMING CHART ANALYSIS
Detailed sequencing of the cylinder can be better understood by studying sequence time
charts discussed in sections as follows:
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 Extended function [
=!J!
]
SQUEEZE DELAY (if programmed) and then proceeds into Squeeze time (EXTEND). A
valve mode of 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 03 is selected to enable both valve 1 (EXTEND) and valve 2
(INTENSIFY). After Hold time is complete, the delay (if programmed) before blocking
begins. When this delay is complete, valve three (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 three (BLOCKING) is on, the sequence
skips SQUEEZE DELAY and immediately begins with schedule 00 Squeeze (EXTEND)
time.
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