ST-150-2
12
– Integrate the compressor module as the last link
into the safety chain.
• Control signal from the system controller (nominal
value for capacity control)
– Connect the Modbus cable to terminal strip CN14.
– Or connect the analogue signal to terminal strip
CN13.
• High pressure limiter
– Connect it preferably to terminal strip CN3 instead
of the bridge, see chapter Schematic wiring dia-
gram for CSW105, page 7 and see chapter
Schematic wiring diagram for OS.95, page 9.
– Alternatively, it can also be integrated into the
safety chain, in that case after the compressor
module.
6.2
Optional electrical connections
To CN4 with OS.95
With OS.95, the solenoid valve in the oil return line (Y9)
can be connected to terminal strip CN4. It is switched
by the compressor module. If this solenoid valve is
triggered by the superior controller, it must be ensured
that the solenoid valve is closed during compressor
standstill and opens only 3 s after compressor start.
With the CSW105 with 230 V voltage supply, the oil
heater (standard extent of delivery) which is switched
on and off if needed by the compressor module is con-
nected here.
6.3
Connecting system controller
6.3.1
Control via Modbus interface
Plug or connect the cable to terminal strip CN14, see
chapter Schematic wiring diagram for CSW105, page 7
or see chapter Schematic wiring diagram for OS.95,
page 9.
In this case, the operating parameters can be mon-
itored via Bluetooth by means of the BEST
SOFTWARE.
6.3.2
Control via analogue signal
The compressor capacity may be regulated via a DC
voltage signal. This type of control is mainly suitable for
systems with simple controllers which are equipped
with an output for 0 to 10 V and a relay, and if the ter-
minal strip CN14 is used for the BEST SOFTWARE.
• Connection to terminal strip CN13, terminals 1 and
2.
• Control signal: 0 to 10 V DC voltage of an analogue
output of the system controller
• As an alternative, a control signal between 4 and
20 mA may be connected to terminals 1 and 2. Con-
nect a 400 Ω resistor in series in this case.
• Control accuracy: ±0.5% at 100%
• Linear control characteristic, see figure.
CR
0
2
4
6
8
10
12
U [V]
0 .. 10 V
100%
25%
2,5
Fig. 3: Control characteristics
6.4
Connecting operation monitoring via the BEST
SOFTWARE
The BEST SOFTWARE accesses the compressor
module via the Bluetooth interface, see chapter Com-
munication via the BEST SOFTWARE, page 15. This
interface is deactivated in some non-European coun-
tries.
◦ If the Bluetooth interface should not be used:
• Connect the BEST interface converter to terminal
strip CN14 (Modbus).
In this case, the capacity control must be preset via the
analogue signal on terminal strip CN13.
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