Vermes MDS 358X user Manual.pdf - 第73页

Initial Operation 62 VTK - TR -BA- 072e - 1 - User Manua l MDS 358X S eries 6.8 Parameter Input an d Start – Step 1: Enter t he disp ensing parameter s (eit her rec ommended by t he man ufacturer or determ ined in y our …

Initial Operation

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

6.6 Initial Liquid Supply

– Step 1: If not using a prefilled cartridge, fill an empty one with the required fluid, till up to

80 % of its capacity.

– Step 2: Insert the cartridge into the corresponding holder and screw it onto the Luer-Lock

connector, rotating clockwise.

– Step 3: Place the compressed-air adaptor onto the cartridge and rotate clockwise until it

latches in place.

– Step 4: Connect the PVC hose with coupler plug KS4-CK-6 to air supply. A coupler socket type

KD4-1/2-A is required.

– Step 5: After establishing a convenient dispensing pressure, activate the pneumatic supply.

IMPORTANT NOTE

Check for leakage

All of the parts must be installed correctly, and the entire configuration must be leak-tight –

otherwise the dispensing fluid can trickle out in an uncontrolled manner.

Valves designed by VERMES Microdispensing can be operated at a relatively low supply pressure,

in the range between 0 bar and 7 bar. This upper limit should not be exceeded in normal

applications; in most cases, even a value of 4 bar is sufficient.

Standard values:

• Low-viscous fluids (e.g. water): 0.5 – 1.5 bar

• Medium viscosity (e.g. SMT-adhesives): 1.5 – 2.0 bar

• High viscosity (e.g. pastes): 2.0 – 7.0 bar

IMPORTANT NOTE

Do not activate system without dispensing medium

Except for the adjust, do not activate the system “dry” (i.e. without dispensing medium).

Otherwise, it might damage the system. For flushing the valve keep within the following limits:

• Needle Lift max. 80

• Falling min. 0.13

6.7 Removing Air Inclusions from the Fluid Box

Air must be removed from the fluid box, for instance after the exchange of a cartridge.

Save the current dispensing parameters beforehand (see paragraph 7.6, page 67).

Confirm the following parameter selection:

Rising 0.5, Open Time 1.5, Falling 0.17, Delay 5–30, Needle Lift 75, Number of Pulses 500–2000

Dispense a quantity of ca. 500 to 2000 shots by pressing [trig].

When this measure is complete, retrieve the initial parameters stored beforehand (see

paragraph 7.7, page 67) and start the dispensing process.

Initial Operation

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

6.8 Parameter Input and Start

– Step 1: Enter the dispensing parameters (either recommended by the manufacturer or

determined in your own experiments) into the submenu “Pulse Parameters” of the control

unit (see paragraph 4.5.2, page 29).

– Step 2: Press [enter] to acknowledge the selection.

– Step 3: Return to the first level of the menu by pressing [esc] repeatedly.

– Step 4: Start the dispensing process by pressing [trig].

INFORMATION

Starting the dispensing process

A dispensing process can only be initiated in the first menu level by all the usual methods.

Starting it in the other menu levels is only possible with the key [trig].

Operation

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

7 Operation

7.1 Triggering a Dispense Sequence

There are three different options to trigger a dispense sequence:

• via keypad on the control unit MDC

Press the [trig] button, a dispensing sequence with pre-set parameters will be triggered.

• via RS-232C command

Use the command “VALVE:OPEN” (further commands in paragraph 8.1.2, page 84).

• via PLC signal

Real time triggering by direct I/O (recommended length of signal: between 0.0001 ms and

35 ms; not relevant for Infinite Mode and External Mode)

7.2 Dispensing and Positioning of Dots (Modes)

To combine a multitude of dots to a predefined structure (e.g. a line or a circle), use one of the

following modes:

• Burst Mode

A single trigger impulse by PLC signal causes a predefined number of dispense cycles.

Number of Pulses: predefined value (e.g. 1–32000)

• Single-Shot Mode

Each dispense point is triggered by an individual PLC signal. When dispensing a continuous

feature (such as a straight line or a circle), the frequency of the dispense trigger signal should

be proportional to the trajectory speed of the axis system. This is necessary to achieve a

continuous line width.

Number of Pulses: “1”

• Infinite Mode

– Continuous dispensing as long as the PLC trigger input is “logic 1”. Dispensing will stop when

the signal is changed to “logic 0”

– Number of Pulses:

– “infinite” (when programmed through keypad)

– “0” (when programmed through RS-232C)

The parameters Rising, Falling, Delay, Needle Lift and Open Time use the values preset in the

menu. Is the PLC trigger signal “logic 1”, the MDC sends dispensing impulses, until the signal

changes to “logic 0”.

• Scenario Mode

A complex set of shots is defined via a scenario. This allows the dispensing even of very

complex structures, since up to ten different segments, each with their own set of

parameters, can be combined. Four different scenarios can be saved.

The parameters are set according to the specifications of the scenarios.

• 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