Vermes MDS 358X user Manual.pdf - 第93页

Operation 82 VTK - TR -BA- 072e - 1 - User Manua l MDS 358X S eries 7.15 Switch ing OFF the Mic rodispen sing System – Step 1: The c urrent di spensing cycle m ust b e completed, so that the va lve is i n home p ositi on…

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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.
Operation
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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).
Communication Interfaces
VTK-TR-BA-072e-1 - User Manual MDS 358X Series
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8 Communication Interfaces
The control unit has three communication interfaces. There is a 9-pin serial interface, RS-232C, a
15-pin PLC interface and an AUX socket.
8.1 Serial Interface RS-232C: 9-Pin Sub-D
Fig. 61: Serial interface
The local interface is structured according to SCPI Standard.
These “Standard Commands for Programmable Instruments” represent a standardized set of
instructions used for control and programming, transmitted in form of ASCII text. They can be
generated by any selectable programming language in any environment. The serial interface
operates by means of software handshake. The hardware handshake communications are not in
use.
INFORMATION
Communication while triggering
Do not send instructions through this interface in the course of a running dispensing cycle.
Communication is only possible between distinct sequences (signal DosOK on “high”). This is
especially important during start-up of a heater.
After sending data or parameters to the control unit, you have to wait for the “OK” signal before
you can start further actions. You only can send data while the MDC is in the main menu.
8.1.1 Pin Functions
PIN Characteristics Level Function
1 Reserved ___________ ___________
2
Output
TX
Serial transmission signal
3
Input
RX
Serial reception signal
4
Connected to PIN 6
5
Ground
Ground
6
Connected to PIN 4
7
Reserved
___________
___________
8
Reserved
___________
___________
9
Reserved
___________
___________
The RS-232C log of the control unit uses RS-232C standard and is designed for communication
via a serial cable, connected 1:1, with a Sub-D nine pin connector.