R&S OSP
Applications
Operating Manual 1505.3896.12 - 14
189
RELAY 2
RELAY 3
RELAY 4
RELAY 1
IN/OUT
14
8
7
15
3
3
4
3
4
3
4
4
+28 V
Figure 8-5: Interlock Monitoring with Module R&S OSP-B104
The above figure indicates the internal wiring for a full interlock loop. On the IN / OUT
connector the pins 7 to 15 have to be connected to door switches, and on each of the
RELAY connectors pins 3 and 4 connect to the carrier safety contacts of the relay.
While a relay is turning, the connection between these two pins is interrupted thus
opening the interlock loop.
If no relay is connected on any of these four connectors, supply a dummy bridge
connector containing a connection between pin 3 and 4. Not doing so will make the
interlock functionality not work.
If the interlock is closed, also the pins 8 and 14 of the IN / OUT connector are bridged
by an
internal relay. This allows to route this line to a power amplifier’s interlock input
thus removing RF power in case of a door which is opened, or of a power relay not
being in its safe position.
See
chapter 8.1.4
for details on the interlock handling in EMC32.
8.5.3 Input Ports of R&S OSP-B104
The input ports of the module R&S OSP-B104 are designed for LVC (Low Voltage
CMOS) logic but can be operated with TTL level up to 5 V as well.
Control circuits like the interlock loop as it is used for EMS systems, often make use of
control voltages up to 28 V DC. It is possible to connect the R&S OSP-B104 input to
circuits with up to 28 V when the following points are observed.
The input lines of the R&S OSP-B104 must be connected with a resistor in series if
voltages > 5 V and
28 V DC are applied.
