Entron EN1000 series

Page 118 • 700120S • ENTRON Controls, LLC.
While the blocking valve is energized, the Control Panel will indicate this status by blinking the
VALVE 3 LED. In this state, the control does not allow programming changes.
To return the electrodes to a fully retracted state, a momentary closure of FS1 will de-energize
Valve 3. The Emergency Stop input may also be used to retract the electrodes. The Valve 3
output will remain off after the Emergency Stop is activated.
In REPEAT sequences when programmed OFF time is shorter than or equal to BLOCKING
time, only BLOCKING DELAY time takes place. When OFF time is greater than BLOCKING
time, the blocking valve will turn on at the end of BLOCKING DELAY time and the control
will continue through an OFF time that is equal to OFF time minus BLOCKING time.
When the control is in sequence and is in SQUEEZE DELAY or in BLOCKING DELAY time
periods, the SQUEEZE and OFF indicator LEDs (respectively) will dim to half their intensity
while the control continues through these times.
When
PP
PP
P
.O..O.
.O..O.
.O.=
0707
0707
07 is enabled, SQUEEZE DELAY time and BLOCKING DELAY time are in place
for all 50 schedules.
SUCCESSIVE schedules can be used with AIR OVER OIL RETRACTION.
BEAT DURING SQUEEZE (
b.E.b.E.
b.E.b.E.
b.E.=
0101
0101
01) by definition will not work well with PROCESS OUTPUT
0707
0707
07 as the electrodes will completely open and the blocking valve will not turn on.
The jumper on TS3 on Terminal
Strip/Firing Board A/N 410319
must be installed as JB, to connect
terminal 1 to VL1, indicated by
“JB” printed on the board (see
Figure 9-14).
Moving this jumper will bypass the
Valve Control Relay, which
normally prevents valve activation
until a weld sequence is initiated.
Since this valve may now be
activated without energizing the
control relay, care MUST be taken
to insure safe operation.
9.5.3 AIR OVER OIL RETRACTION OPERATION –
PP
PP
P
.O..O.
.O..O.
.O.=
0707
0707
07 (cont.)
Figure 9-14. Air Over Oil Retraction
connections
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 WARNING
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