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Active r.h. sensors need an external supply
voltage. For that purpose, terminal 3 has a
+20 VDC offering.
7.4.3 Wiring for control signal and
safety (interlock) system for
multiple devices
In the case of multiple units, separate humid-
ifiers work together. The control signal and
the safety (interlock) system are connected
to the master unit as described above. In
addition, connecting cables are established
between the guiding unit and the successing
unit(s) (provided on-site). These provide the
successing unit with a control signal from the
guiding unit and the transmitted (potential
free) safety (interlock) system.
The wiring for the control signal and the
safety (interlock) system must be imple-
mented as follows for multiple units:
1)
„ST0x“ designates connector plugs on the mainboard
2)
„K21“ is the relay used for the connection of the suc-
cessing unit
7.5 Connection diagram
Pls. find the full wiring diagram in the „Unit
control“ chapter of this manual (section „Main
PCB connections“).
7.6 Electrical installation check
list
Check electrical installation with respect to
customer-site requirements and local power
supply regulations.
Safety interlock properly wired
across terminals 1 and 2?
Supply voltage in accordance with
name plate voltage rating?
All ectrical connections made accor-
ding to the wiring diagram?
R.h. sensor properly connected with
respect to signal type and supply
voltage (only when r.h. sensor is in
use)?
All screw terminal connections prop-
erly tightened?
Have all electrical cable and plug
connections been properly tighte-
ned?
Proper unit gounding made?
3OHDVHQRWH
3
45
6
7
+20 VDC
Humidity sensor
Terminal strip
GND
0...10V
Exemplary 0...10V humidity
sensor connection
1)
2)
12 13 11 14
5 4 1 2
ST07
K21
ST08
ST01
1)
1)
Guiding unit
Successing unit
