Vermes MDS 358X user Manual.pdf - 第92页

Operation VTK - TR -BA- 072e - 1 - User Manua l MDS 358X S eries 81 offset (menu item “Cooler Offset”, see a lso paragraph 7.14.2 , page 81) an d se t the tar get tempe ratu re (menu it e m “Cooler Tem p.” ). The p ossib…

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VTK-TR-BA-072e-1 - User Manual MDS 358X Series
7.14 Dispensing with a Cooling Valve
The Microdispensing System MDS 3580 can optionally be equipped with a flow control valve as a
cooling valve (meaning: to cool the microdispensing valve). One option is the FCV-AC 6.0 M12
(see Fig. 59). More detailed information about the menu, while using a cooling valve, you can
find in paragraph 4.5.3.1, page 31 and paragraph 7.14.1, page 80.
Fig. 59: FCV-AC 6.0 M12
A VERMES Microdispensing Valve works best, if the temperature inside the valves stays below a
certain limit. E.g. for the MDV 3580 this limit is at 80 °C for the actuator system and 39 °C at the
outside of the valve body. For this reason, microdispensing valves can be fitted with an air
cooling adapter (see Fig. 34, page 56).
With the MDC 3500, it is possible to control the airflow according to the temperature inside the
valve. This improves the dispensing accuracy and allows you to save compressed air costs.
To regulate the compressed air flow, the MDC controls a flow control valve, e.g. the FCV-AC 6.0
M12 (see Fig. 59). It regulates the air flow between your compressed air supply and the
microdispensing valve you want to cool.
At the same time, the MDC is connected with the sensor module of the microdispensing valve
and receives the temperature values from inside the valve. This grants the MDC the information
needed to keep the target temperature in the correct range by increasing or decreasing the
cooling airflow as necessary. You can also set a cooler offset, which creates a minimum airflow,
independent of the regulation (menu item “Cooler Offset”, see paragraph 7.14.2, page 81).
The compressed air connectors of the VERMES flow control valves are marked on one side, “1” is
“IN” and “F” is “out. These connectors have 6 mm diameter. If you want to connect the valve with
a microdispensing valve with 3 mm connectors, you need a 6 mm to 3 mm adapter.
How to mount a flow control valve for cooling the MDV, you can find in paragraph 6.3, page 49.
With the Connection Cable for FCV-AC/HF M12 to MDC, you connect the flow control valve to the
MDC (see paragraph 6.3.3.5, page 54). Information on how to connect the compressed air supply
onto the MDV and for the necessary minimum quality of the compressed air you can find in
paragraph 6.4, page 56.
INFORMATION
Cooling deactivated during the adjust
If you perform an adjust while the cooling is activated, the cooling is deactivated automatically.
After you have performed the adjust, the cooling will be automatically switched ON again.
7.14.1 Cooling and MDC
You can activate the cooling via the cooler submenu in the MDC menu (see picture below). Use
the [enter] and arrow keys to navigate down to the submenu “Cooler” in the menu
“Cooler/Heater”. Here you can switch ON the cooling (menu item “Cooler ON/OFF”), set a cooler
Operation
VTK-TR-BA-072e-1 - User Manual MDS 358X Series
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offset (menu item “Cooler Offset”, see also paragraph 7.14.2, page 81) and set the target
temperature (menu item “Cooler Temp.”). The possible temperature range lies between 10 °C
and 120 °C. (Further information about the menu of the control unit you can find in
paragraph 4.5, page 27.)
Fig. 60: Submenu Cooler
INFORMATION
Control cooling via serial commands
The cooling can also be controlled via the serial interface. The relevant commands and
information can be found in paragraph 8.1.2, page 84.
7.14.2 Cooler Offset
The cooler offset sets an offset value for the flow control valve (in %), which is independent from
the regulation system. The cooler offset allows for a constant airflow through the valve, even if
the regulation system does not require an airflow yet. Only when the regulation system requires
an airflow above the cooler offset, the regulation takes over. I.e. the cooler offset is not added to
the normal value, but sets a minimum value.
Using a cooler offset can be helpful in some applications, e.g. if your application has many short
but intense bursts. For such an application, the regulation could be a bit slow, if it always drops
back to zero airflow.
Use the arrow keys to reach the menu item “Cooler Offset” within the submenu “Cooler” (see
paragraph 7.14.1, page 80). Press the [enter]-key and then use the arrow keys to set the desired
value. A value of 0 % means that the cooler offset is deactivated. A value of 100 % would mean
that the flow control valve is always opened completely.
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VTK-TR-BA-072e-1 - User Manual MDS 358X Series
7.15 Switching OFF the Microdispensing System
– Step 1: The current dispensing cycle must be completed, so that the valve is in home position.
– Step 2: Lower the supply pressure to atmospheric pressure (because in initial position, the
valve is still opened). Disengage the pneumatic supply. If required, close the cartridge by
using locking pin MDT 309.
– Step 3: Switch OFF the control unit (ON/OFF button at the rear end). After switching OFF the
control unit, please wait a few seconds.
– Step 4: Disconnect the valve from fluid supply.
– Step 5: Remove all cables from the valve.
– Step 6: Unscrew the screws used for fixing the valve in place.
After working with self-curing substances, immediate cleaning is advisable in order to avoid
clogging. This concerns the valve itself and all parts in contact with the fluid. The valve and its
subcomponents have to be dismantled and cleaned (see chapter 9, page 120).