Vermes MDS 358X user Manual.pdf - 第91页

Operation 80 VTK - TR -BA- 072e - 1 - User Manua l MDS 358X S eries 7.14 Dispen sing with a Cooli ng Valve The Microd ispe nsing Sys tem MDS 3 58 0 can option ally be eq uipp ed with a flow c ontr ol valve as a cooling v…

Operation

VTK-TR-BA-072e-1 - User Manual MDS 358X Series

In the display, the message “Heater not calibrated” appears. The

display then switches between this message and the message “Press

enter”.

Press the [Enter]-key.

then

Step 5 (Second calibration is running)

After several seconds, in the display appears the message

“Calibration … Heater 20°C”.

Wait until a new message appears: Heater is calibrated. The

calibration has been completed.

Step 6 (Calibration completed, second calibrator screwed off)

The calibration has been completed successfully. Screw off the

calibrator. In the display, you get the message “Heater is

disconnected”.

Error during calibration

In case an error happens during the calibration, in the display

appears the message “Error Calibration” for approx. 2 s.

There can be different causes for an error, e.g.

• calibration stopped too early

• communication was interrupted

• calibrator not correctly connected

• you used the same calibrator twice

• defect at the MDC

Once you have solved the problem, you have to repeat the

complete calibration, starting at step 1.

Information!

In case of an error during the calibration, the values are set

back to the default values. You will be able to work with these

values, but the results will not be as precise as with a correctly

calibrated heater.

Tab. 26: Calibration of the heater

Once the full calibration is completed, you can proceed with the normal work at your application.

Operation

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

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.