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Operation VTK - TR -BA- 171e - 1 - User Manua l MDS 3080 -V 77 7.14 Dispensing wi th a Heater With a heate r , you can contr ol the dyna mical v iscosit y of the fluid t o be dis pensed. For som e liqu ids , dispensing w…

Operation

VTK-TR-BA-171e-1 - User Manual MDS 3080-V

7.12 Fixed Adjust

The fixed adjust is for special applications with media which react with air. A typical example

would be cyanoacrylate.

You can only use the fixed adjust mode, if “FixedAdjust” is set to “ON” in the MDC submenu

“Status” (see paragraph 4.5.4, page 31).

The fixed adjust is automatically coupled with the first drop mode. Therefore, you cannot select

the submenu “FirstDrop ON/OFF”, while “FixedAdjust” is switched “ON”. Since the fixed adjust

influences the normal adjust, you will be asked to perform an adjust every time the fixed adjust

mode is switched “ON” or “OFF”. It is important to do this, since a correctly performed adjust is a

requirement for good dispensing results.

In the fixed adjust mode some parameters for the adjust (see paragraph 6.5, page 52) and the

first drop adjust (see paragraph 7.11, page 71) are slightly different. The adjust in fixed adjust

mode can be confirmed in a range from 0 µm to 50 µm. For the first drop adjust in fixed adjust

mode, TNLmax is set to 50 %. Otherwise, you can follow both processes as usual.

In fixed adjust mode, the function “Needle Lift” in the submenu “Pulse Parameters” is replaced by

“True Needle Lift”, but normally keeps the same value. In fixed adjust mode the True Needle Lift is

capped at 80 %. In case the value for the Needle Lift is higher than this limit, it will be changed

into a True Needle Lift of 80 % when switching into fixed adjust mode.

IMPORTANT NOTE

Minimum values for Falling and Rising in fixed adjust mode

In fixed adjust mode, the minimum values for Falling (0.30 ms) and Rising (0.50 ms) are fixed and

do not depend on the needle lift.

7.13 Auxiliary Mode

In this mode, you cannot dispense, since there is no internal communication with the valve. The

valve might even be disconnected. But you can use all other functions of the MDC, e.g. check

your parameters or control a heater. While in auxiliary mode, the display shows the message

“Auxiliary Mode” in the bottom line. Auxiliary mode is automatically deactivated when you

switch off the MDC.

You can enter the auxiliary mode through the menu. You have to enter service code “1000” in the

submenu “Service Code” which is part of the menu “Service Option” (see paragraph 4.5.6,

page 33).

After the error messages 101 (Incorr. Valve) and 199 (Valve Error), you also get the chance to

switch to the auxiliary mode. This allows you to keep control of the information and most of the

functions of the MDC in such a situation (see chapter 11, page 149).

When an auxiliary mode is activated, it will automatically be deactivated during the start-up of

the MDC, if a compatible microdispensing valve is connected.

Operation

VTK-TR-BA-171e-1 - User Manual MDS 3080-V

7.14 Dispensing with a Heater

With a heater, you can control the dynamical viscosity of the fluid to be dispensed. For some

liquids, dispensing without heating is impossible. Heating may also be required to ensure a

constant process temperature, or when the dispensing has to take place above room

temperature.

The Microdispensing System MDS 3080-V can be optionally equipped either with the nozzle

heater MDH-48-BY (order no. 1014231) or with the nozzle heater MDH-48-BY-BH (order no.

1015224). For this heater you need an external control unit, for example the Multifunctional

controller MFC 3000 (order no. 1014981), which can also control cooling valves, or the MHC 48-1

(order no. 1014107). You can find detailed information about these control units in their

respective user manuals.

IMPORTANT NOTE

urn ON channel at MFC before starting MDC

In case you use an MFC to control a cooling valve, you have to turn ON the respective channel at

the MFC, before you switch on the MDC.

INFORMATION

MDC 3090-V cannot control MDH-48-BY/MDH-48-BY-BH

With the control unit MDC 3090-V you cannot control a heater of the MDH-48-BY Series.

Completely ignore the submenu “Heater” of the MDC and the serial commands for heaters.

CAUTION

igh temperatures, danger of burns

The nozzle heater can reach temperatures of up to 180 °C. Do not touch this area during

operation, since there is the danger of severe burns. Afterwards only touch it once it has cooled

down and use heat resistant gloves.

7.14.1 The Adjust with Heater

The adjust is necessary to position the nozzle insert to the tappet before beginning with the

dispensing process itself. Please perform the adjust for every initial startup and after every

disassembly of the nozzle fixation nut. The adjust is especially important to avoid any leakage

during dispensing (see also paragraph 6.5, page 52).

IMPORTANT NOTE

Heating and adjust

In case your application uses a nozzle heater, you have to activate the heater before you start the

adjust. Make sure to wait long enough for the heater to reach stable temperature, since the

adjust could lead to an incorrect result otherwise.

Wear heat-resistant gloves while working with the valve!

IMPORTANT NOTE

just only with cleaned system

Make sure the system is always cleaned before you start an adjust. The presence of dirt particles

jammed between the tappet surface and the nozzle insert would compromise the results.

Operation

VTK-TR-BA-171e-1 - User Manual MDS 3080-V

Preparation for the Adjust

Turn the adjust screw completely in the direction

“open” (see arrow on the valve).

Screw the nozzle fixation nut absolutely tight

(torque for screwing it tight at least 150 cN.m).

Turn on the heater and bring the heater to the

desired temperature. Wait a few moments for the

system to settle in this temperature.

Step 1 (Starting the adjust)

Start the adjust by pressing the [adj] -key on the

keypad of the control unit.

The message “Release NU ATT Fluid!!!!!!” appears in

the display (NU = Nozzle Unit).

Confirm it by pressing the [enter]-key.

The display shows the message “500 Shots –

Please Wait”. These shots help to prepare the valve

for the adjust.

Confirm it by pressing the [enter]-key.

The display shows “Calibration Please Wait”. This

can take a few moments. Please wait.

If the quality of the valve is okay, you will reach the

next step without pressing [enter].