Vermes MDS 358X - Fig. 35: Screwing Tight the Nozzle Fixation Nut; The Adjust Process

Initial Operation
VTK-TR-BA-072e-1 - User Manual MDS 358X Series
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6.5 The Adjust Process
This chapter explains the adjust process, which is performed as a top adjust when using a valve
of the MDV 358X Series, thanks to the adjust screw. A thoroughly performed adjust is the basis
for clear and reproducible dispensing results.
The microdispensing system is unable to perform a regular repeatable process, if the nozzle
insert is not properly positioned relatively to the tappet prior to dispensing. Therefore, you have
to perform the adjust during initial operation and after each exchange of the nozzle fixation nut.
This is especially important to avoid any leakage during dispensing.
Here, the adjust via keypad is described. You can also control the adjust via the serial interface as
remote adjust (see paragraph 8.2.3 "Remote Adjust", page 117). For special applications you can
set an adjust offset with service code 33 (see paragraph 7.12 "Adjust Offset", page 75).
IMPORTANT NOTE
Cleaning before adjust
The system has to be cleaned thoroughly before the adjust. The presence of dirt particles
jammed between the tappet surface and the nozzle insert would compromise the results. For
information how to remove the dirt read the cleaning chapter (see chapter 9, page 120).
INFORMATION
Adjust deactivates heater and cooling
In case heater or cooling are still ON, they will be automatically deactivated by an adjust. After
you have performed the adjust, the cooling will be automatically switched back to the ON/OFF
status before the adjust. But the heater needs to be turned ON again manually, if you need it for
your application.
INFORMATION
Time limit for the adjust
If you do not reach step 3 of the adjust after approx. two minutes, the adjust is cancelled. You
have to start the adjust from the beginning.
Preparation for the adjust:
– Screw the nozzle fixation nut absolutely tight (see Fig. 35; torque for screwing it tight at least
150 cN.m).
Fig. 35: Screwing tight the nozzle fixation nut
Adjust, step 1 (Starting the adjust):
– Press the [ADJ]-key on the keypad of the control unit.