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Operation 60 VTK - TR -BA- 171e - 1 - User Man u al MDS 3080 -V Delay (DL) This waiting p hase between two cy cles is a djust able in steps of 0. 1 ms, but i t is rec ommend ed to use at least 0.2 ms. CAUTI ON! For va lv…

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Operation
VTK-TR-BA-171e-1 - User Manual MDS 3080-V
59
• External Mode
The “External Mode” will shift the responsibility of time control of the parameter “Open Time”
to the higher-level machine control. (This may require a very precise time control of the
higher level PLC.) As a result, the valve would function like a “Time-Pressure-Valve”.
Activation of the control unit via RS-232C command by changing the pulse parameters. For
the External Mode set the Open Time to “external”.
Number of Pulses: Should be set to “1” (min delay still applies).
Open Time calculates according to: Length trigger impulse – length Rising = length Open
Time
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.
7.3 Parameters for the Dispensing Process
The profile of the system behavior is illustrated below (Y axis = amplitude of the tappet).
Fig. 23: 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 = 3000 ms
CAUTION!
When working in External mode, the cycle is initiated with following
properties:
For rising, falling and needle lift, the values determined beforehand are used.
Open time however remains active until the signal returns to the state
“logic 0”.
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
compression chamber (the cavity at the rear end of the nozzle insert). The
interval is adjustable in steps of 0.01 ms.
Operation
60
VTK-TR-BA-171e-1 - User Manual MDS 3080-V
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.
CAUTION!
For valves operated with connected heating systems, a minimum delay of 2.0
ms is necessary. Lower values can only be achieved, if the heater is operated
via an external control unit.
Needle Lift (NL)
This parameter describes the stroke of the tappet, compared to its full value
of 100 %.
Tab. 19: Parameters for dispensing
Operation
VTK-TR-BA-171e-1 - User Manual MDS 3080-V
61
7.4 Minimum and Maximum Parameter Limits
Parameters Min. Value Max. Value Transform. Factor
(serial interface)
Rising
NL 2 % = RI 0.01 ms
NL 10 % = RI 0.05 ms
NL 20 % = RI 0.10 ms
NL 30 % = RI 0.15 ms
NL 40 % = RI 0.20 ms
NL 50 % = RI 0.25 ms
NL 60 % = RI 0.30 ms
NL 70 % = RI 0.35 ms
NL 80 % = RI 0.40 ms
NL 90 % = RI 0.45 ms
NL 100 % = RI 0.50 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 2 % = FA 0.01 ms
NL 10 % = FA 0.03 ms
NL 20 % = FA 0.06 ms
NL 30 % = FA 0.09 ms
NL 40 % = FA 0.12 ms
NL 50 % = FA 0.15 ms
NL 60 % = FA 0.18 ms
NL 70 % = FA 0.21 ms
NL 80 % = FA 0.24 ms
NL 90 % = FA 0.27 ms
NL 100 % = FA 0.30 ms
300 ms
*10 or *100
e.g.
FA = 0.8 ms ≙ 8
or
FA = 0.08 ms ≙ 8
(Depends on the
command. See the
command description in
paragraph 8.1.2.2,
page 88.)
Open Time
0 ms
3000 ms
*10
e.g.
OT = 2 ms ≙ 20
Needle Lift
2 %
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
(2 ms with heater)
1000 ms
*10
e.g.
DL = 5 ms ≙ 50
Heater
Target temperature
180 °C
*1
e.g.
Temp = 120 °C ≙ 120
Tab. 20: Minimum and maximum parameter limits