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Micro disp en sing Va lve VTK - TR -BA- 171e - 1 - User Manua l MDS 3080 -V 35 5 Microdispensing Valve This chapter c ontain s relevant inf ormation a bout th e valve. I t descr ibes the struct ure and th e hardware con …

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Control Unit MDC
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VTK-TR-BA-171e-1 - User Manual MDS 3080-V
4.6 Memories of the MDC
The MDC contains several memories to save parameter setups.
The first one is the RAM (Random Access Memory). Here the parameters of the current dispense
process will be saved. This memory will be erased when the controller is switched of or
disconnected from power. When starting again, the MDC will load the first of eleven parameter
memory sets saved on the EEPROM (Electrically Erasable Programmable Read Only Memory) into
the RAM. This first parameter setup is also called the “EEPROM current working parameter
configuration”, or short “working configuration” or “EEPROM working configuration”.
The parameter set in the EEPROM working configuration is usually the same as the parameter set
saved in the RAM memory. When using the keypad to program the controller, the two memories
will always have the same contents. The only way to create a difference in the parameter set
saved in the RAM and in the EEPROM working configuration is by using some special commands
through the RS-232C.
The remaining ten EEPROM memory sets can be used to save different parameter setups when
programming the controller through the keypad interface (use the command [Save]).
In order to change the values saved in the EEPROM working configuration you may use the MDC
keypad (enter the parameters in the menu “Pulse Parameters”, then press [Enter]).
Alternatively, you may use one of the following commands via RS-232C:
• TRIGGER:SET:<Rising>,<Open Time>,<Falling>,<Needle Lift>,<Number of Pulses>,<Delay>,1
• TRIGGER:ASET:<Rising>,<Open Time>,<Falling>,<Needle Lift>,<Number of Pulses>,<Delay>,1
• STRIGGER:SET:<Rising>,<Open Time>,<Falling>,<Needle Lift>,<Number of Pulses>,<Delay>,1
• STRIGGER:ASET:<Rising>,<Open Time>,<Falling>,<Needle Lift>,<Number of Pulses>,<Delay>,1
All values transmitted to the control unit by one of the following four commands will not be
saved in the EEPROM working configuration.
• TRIGGER:SET:<Rising>,<Open Time>,<Falling>,<Needle Lift>,<Number of Pulses>,<Delay>
• TRIGGER:ASET:<Rising>,<Open Time>,<Falling>,<Needle Lift>,<Number of Pulses>,<Delay>
• STRIGGER:SET:<Rising>,<Open Time>,<Falling>,<Needle Lift>,<Number of Pulses>,<Delay>
• STRIGGER:ASET:<Rising>,<Open Time>,<Falling>,<Needle Lift>,<Number of Pulses>,<Delay>
Instead, it will remain in the RAM memory until erased by another RS-232C command, or when
the control unit is switched OFF and the EEPROM is read out into the RAM during restart. The
reason for having these two different types of commands (the distinction is the “1” at the end) is
that it takes up to 1 sec to save the parameter set in the EEPROM.
On top of the working configuration and the ten parameter setups, there is another parameter
setting saved in the software on the EEPROM. This is called the “factory setting”. You cannot
change it. It may be loaded to the working configuration and the RAM memory after major
disturbances of the system.
Additionally, there is the possibility to save combinations of setups, so called “Scenarios” (see
paragraph 7.9 "Scenarios", page 66).
Microdispensing Valve
VTK-TR-BA-171e-1 - User Manual MDS 3080-V
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5 Microdispensing Valve
This chapter contains relevant information about the valve. It describes the structure and the
hardware configuration.
5.1 Composition of the Valve
The Microdispensing valves of Vermes Microdispensing are modular. A valve is composed of
seven different modules:
• Valve body (includes Electronics module and Actuator system) (1)
• Tappet (not visible) (2)
• Tappet sealing (not visible) (3)
• Nozzle insert (not visible) (4)
• Nozzle fixation nut (5)
• Fluid box (6)
• Media supply (7)
Fig. 11: Composition
The valve body (1) accommodates the electronics module, the actuator system and the adjust
screw. The electronics module holds the electronics to receive the actuator and sensor signals.
Here are the connectors for sensor cable and actuator cable integrated in the surface of the case;
they have to be linked to the control unit. The electronics module is connected to the actuator
system, representing the core of the microdispensing valve. The actuator system houses the
Microdispensing Valve
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VTK-TR-BA-171e-1 - User Manual MDS 3080-V
sensor, the piezoelectric element and the mechanics to drive the tappet. Actuator case and
mechanics are sealed for protection against dust and contamination.
At the bottom of the valve is the inlet where the tappet (2) runs. You can exchange the tappet.
Powered by the actuator the tappet moves with high speed back and forth. It hits the dispensing
medium and presses it through the opening of the nozzle insert. Tappets can be made of
ceramics or of carbide metal. They can have different forms or sizes. A tappet should be checked
and cleaned regularly or exchanged if necessary (see paragraph 6.2 "First Assembling of the
Valve", page 41). The adjust screw (8; see paragraph 5.2, page 37) is at the top end of the valve
body.
The connection between valve body and fluid box is made up of the tappet sealing (3). There are
different types of tappet sealings, e.g. the Tappet Sealings PE and PTFE. These tappet sealings
have to be used together with a tappet centering piece.
A small but important module is the nozzle insert (4), which has to be considered as a wearing
part. Thanks to the bayonet fluid box, it can easily be cleaned and exchanged in case of need.
VERMES Microdispensing offers a large selection of different nozzle inserts to allow for optimum
dispensing results, according to the current application. They can differ in form and material.
The nozzle fixation nut (5) contains the nozzle insert (NI).
The fluid box (6) contains the Fluid Box Body MDF 1500-BY-40 (order no. 1014538, see Fig. 12).
Information how to assemble a fluid box you can find in paragraph 6.2, page 41.
The media supply (7) supplies the dispensing medium and is connected with the fluid box.
VERMES Microdispensing has many different configurations available (see paragraph 13.4,
page 160). For smaller amounts to be dispensed you can use a cartridge. They come in different
sizes and types. For larger amounts, you can use a tube connector to connect a pressure tank
with the fluid box.
Fig. 12: Fluid Box Body MDF 1500-BY-40