Installation
Multitronic-Retrofit Kit_01_2004-06-16 13
Connection of optional operating alarm – X5
The board is equipped with an optional terminal bar X5 for the alarm (not
available in 5-valve models). This ensures that the contact at X5 is opened in the
event of an alarm or power failure.
Connection of optional dewpoint sensor unit – X8, X5 and S2
Terminal bar X8 provides the input terminals for the dewpoint sensing system.
► Connect the signal cable of the sensor to terminals 4 (brown), 5 (white) and 6
(green) on terminal bar X8.
► If you wish to connect an external dewpoint sensing system with a 4-20 mA
output, use only terminals 5 (4-20 mA) and 6 (PE/GND) of bar X8.
► If you wish to connect the alarm contact of an external dewpoint sensor to
control the Multitronic, it must be designed as a potential-free normally closed
contact and connected to terminals 3 and 4 on bar X8. In this case, DIP
switch S2 must be set to position OFF to ensure that the display does not
show a sensor error (“SENS”).
The terminal bar X5 is designed as a potential-free alarm contact for the output of
an auto-resetting dewpoint alarm (not available in 5-valve models or in
conjunction with an external digital input port).
By default, the dewpoint alarm is set to a value of +5 °C above the respective
nominal switc hi ng value for dewpoint sensor contro l.
► If the current dewpoint measured via the 4-20 mA input is to be shown the
Multitronic display, set DIP switch S2 to position ON.
Resetting system
Switch S3 is used as the reset key. It enables operators to reset the currently run
programme.
In order to prevent sudden changes in pressure when the system switches
between the vessels, only certain steps of the programme procedure are reset
(see logical diagram in the Multitronic summary operating manual).
Display and configuration of the nominal dewpoint value
The display board located in the cover of the switch box is equipped with a
plus/minus key labelled “Dewpoint +/-“.
To view the preset nominal value, press the key once (ensure that the control
system is on).
To adjust the nominal value, press key again; the value is adjusted in steps
of 1 degree.
The default value is –40 °C. If the measured dewpoint reaches this value, the
system switches vessels.
Installing the electrical connection
For instructions on how to connect the unit to the power supply system, please
refer to the Multitronic summary operating manual.
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