IM 12D08N05-01E
3-11
<3. INSTALLATION AND WIRING>
“ALARM” Contact “FAIL” Contact
Power Off
NC
NC
Power On
NC
NC
Alarm
NO
NC
Fail
NC
NO
Fail and Alarm
NC *
NO
HOLD
NC
NC
*
When a fail situation occurs which is related to the parameter associated with the contact
(Conductivity, Concentration or temperature) the contact will go to NC. When the fail situation is
not related to the parameter associated with the contact the contact will remain in the state it is
currently in.
Be beyond 300 V AC and please use a cable of the electric current capacity according to
the load connected to contact output.
3.4.3 Contact input
It is necessary to use screening/shielding on the input signal cables. Terminal 63 is used to
connect the shielding.
3.5 Wiring the mA-output signals
3.5.1 General precautions
The analog output signals of the SC450G transmit low power standard industry signals to
peripherals like control systems or strip-chart recorders (Figure 3.6).
3.5.2 Analog output signals
The output signals consist of active current signals of 4-20 mA. The maximum load can be
600 ohms on each. Should be used the cable beyond 30 V AC.
It is necessary to use screening/shielding on the output signal cables. Terminal 63 is used
to connect the shielding.
3.6 Wiring the sensor system
3.6.1 General precautions
Generally, signals from sensors are at low voltage and current level. Thus a lot of care must
be taken to avoid interference. Before connecting sensor cables to the converter make
sure that following conditions are met:
- the sensor cables are not mounted in tracks together with high voltage and or power
switching cables
- only standard sensor cable or extension cable is used
- the converter is mounted within the distance of the sensor cables (max. 10 m) + up to
60m WF10 extension cable.
- the setup is kept flexible at the sensors end for easy insertion and retraction of the
sensor in the fitting.
