OIL-HYDRAULIC PRESSES WITH TWO UPRIGHTS
OPERATION AND MAINTENANCE MANUAL
22
6.3
ELECTRONIC CYCLE CAMS
The machine is equipped with a programmable electronic system capable of controlling, during the work cycle,
the position of the slide and the blank-holder and activating the intervention sequence of the solenoid valves as
required. Two wire encoders are used at the input of the system for this purpose.
In addition, the electronic system allows to pilot the proportionally-controlled solenoid valves which establish the
work power of the slide cylinder, the counter force of the blank holder cushion and the slide downstroke speed.
6.3.1
CONTROL OF SLIDE STROKE
The position of the slide during its stroke is displayed on the
INDUSTRIAL PC. This electronic instrument allows to
programme all the cycle parameters (T.D.C.; BRAKING; B.D.C.;
etc.) and moreover 3 auxiliary cams (AUX1; AUX2; AUX3) are
available.
The most significant parameters to be set are the following:
T.D.C............... This determines the T.D.C. and that is the slide
stopping point during upstroke.
BRAKING......... This should be positioned so that the cam
intervenes before the die closes (this should be
numerically higher than the value previously set).
B.D.C. ............. This determines the B.D.C. and that is the point
during the slide stroke when movement is
inverted; this should be numerically higher than
the value previously set.
KNOCKOUT..... This determines the intervention point of the
knockout during the return; this should be
numerically higher than the value set for T.D.C.
Overstroke cam:
each machine model is equipped with two limit switches which have a safety function at
B.D.C. and at T.D.C.
If the relevant limit switch is pressed, the auxiliary circuits of the machine will be de-
activated. The machine can be re-started by following the procedure given in this manual.
NOTE:
To insert the data of the slide cycle cams refer to the programming manual of the
INDUSTRIAL PC.
micro at T.D.C.
T.D.C.
Braking
B.D.C.
micro at B.D.C.
DOWN
UP
SLIDE
Overstroke check
Overstroke check
AUX 3
AUX 2
AUX 1
Knockout
AUX 3
AUX 2
AUX 1
