Vermes MDS 358X user Manual.pdf - 第76页
Operation VTK - TR -BA- 072e - 1 - User Manua l MDS 358X S eries 65 compr ession ch amber (t he cavity at the r ear end of the n ozzle i nsert ). The interv al is adju stable i n step s of 0.01 ms. Delay (DL) This waitin…
Operation
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VTK-TR-BA-072e-1 - User Manual MDS 358X Series
The parameters Rising, Falling and Needle Lift use the values preset in the menu. When the
trigger signal is set to “logic 1”, the valve will open. It will remain open as long as the trigger
signal remains on “logic 1”. It will start to close when the trigger signal is switched to “logic 0”.
After the valve has completely closed, the controller is ready to receive the next trigger signal
to start the process again.
INFORMATION
Open Time and Needle Lift
The maximum value for the “Open Time” is limited to 15 ms, if the “Needle Lift” is set to more
than 80 %. If not, the limit is 3000 ms. The length of the “Open Time” depends on the PLC-signal
(logic 1).
7.3 Parameters for the Dispensing Process
The profile of the system behavior is illustrated below (Y axis = amplitude of the tappet).
Fig. 48: System behavior
This diagram includes the following parameters.
Parameter Description
Rising (RI)
This interval describes the time required until the valve is completely
opened. It is adjustable in steps of 0.01 ms.
Open Time (OT)
During this phase, the valve remains in opened state. It is adjustable in steps
of 0.1 ms.
Max. open time for ≤ 80 % NL = 3000 ms
Max. open time for > 80 % NL = 15 ms
CAUTION!
When working in External mode, the cycle is initiated with following
properties:
For rising, falling, delay and needle lift, the values determined beforehand
are used. Open time however remains active until the signal returns to the
state “logic 0” (for needle lift ≤ 80 %).
Maximum open time for needle lift > 80 % is restricted to 15 ms.
Falling (FA)
The falling ramp of the curve illustrated above represents the time required
for closing the valve. Residual fluid meanwhile is expulsed from the nozzle
Operation
VTK-TR-BA-072e-1 - User Manual MDS 358X Series
65
compression chamber (the cavity at the rear end of the nozzle insert). The
interval is adjustable in steps of 0.01 ms.
Delay (DL)
This waiting phase between two cycles is adjustable in steps of 0.1 ms, but it
is recommended to use at least 0.2 ms.
Needle Lift (NL)
This parameter describes the stroke of the tappet, compared to its full value
of 100 %. For the range between 81 % and 100 %, the valve works in bipolar
mode. The elevated temperature in this range reduces the average frequency
and the lifetime of the valve. A needle lift between 70 % and 80 % is the best
working range.
Tab. 20: Parameters for dispensing
Operation
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VTK-TR-BA-072e-1 - User Manual MDS 358X Series
7.4 Minimum and Maximum Parameter Limits
Parameters Min. Value Max. Value Transform. Factor
(serial interface)
Rising
NL 1 % = RI 0.01 ms
NL 10 % = RI 0.03 ms
NL 20 % = RI 0.06 ms
NL 30 % = RI 0.09 ms
NL 40 % = RI 0.12 ms
NL 50 % = RI 0.15 ms
NL 60 % = RI 0.18 ms
NL 70 % = RI 0.21 ms
NL 80 % = RI 0.24 ms
NL 90 % = RI 0.27 ms
NL 100 % = RI 0.30 ms
300 ms
*10 or *100
e.g.
RI = 0.5 ms ≙ 5
or
RI = 0.05 ms ≙ 5
(Depends on the
command. See the
command description in
paragraph 8.1.2.2,
page 88.)
Falling
NL 1 % = FA 0.01 ms
NL 10 % = FA 0.01 ms
NL 20 % = FA 0.02 ms
NL 30 % = FA 0.03 ms
NL 40 % = FA 0.04 ms
NL 50 % = FA 0.05 ms
NL 60 % = FA 0.06 ms
NL 70 % = FA 0.07 ms
NL 80 % = FA 0.08 ms
NL 90 % = FA 0.09 ms
NL 100 % = FA 0.10 ms
300 ms
*100
e.g.
FA = 0.08 ms ≙ 8
Open Time
0 ms
NL 1-80 % = 3000 ms
NL 81-100 % = 15 ms
*10
e.g.
OT = 2 ms ≙ 20
Needle Lift
1 %
100 %
*1
e.g.
NL = 50 % ≙ 50
Number of Pulses (NP)
1 pulse
32000 pulses
*1
e.g.
NP = 80 ≙ 80
Delay
0.1 ms
1000 ms
*10
e.g.
DL = 5 ms ≙ 50
Heater
Target temperature
Depends on the
connected heater (a
maximum of 300 °C can
be set)
*1
Tab. 21: Minimum and maximum parameter limits