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IP258
13
4.6 ELECTRICAL CONNECTIONS
All field wiring connections are accessible by removing the lower lid, which is secured by two screws. Note that it is
the responsibility of the installer to observe all local regulations and approval requirements, and to use cable to suit
the environmental requirements of the particular application. Obtain and check any hazardous area work permits
required before applying power to the MSM400.
The diagram below shows the layout of external connection terminals: all terminal blocks are suitable for wires
0.5mm
2
to 2.5mm
2
(26-12 AWG). Insulation should be stripped back 7mm.
Ensure wiring is suitable for the load current and the insulation is suitable for the voltage, temperature and
environment of the installation.
Note that in intrinsically safe systems, apparatus connected to the MSM400 must not be supplied from a voltage
greater than 250V rms or 250V DC.
Figure 9: Connection Terminal Layout
Note that not all of the labelled terminals are functional in this version of the MSM400. The functions available are
listed below :
CONNECTION DESCRIPTIONS :
Terminal Label Function
1 RX A Sensor Cable
2 RX B Sensor Cable
3 RX SCN Screen for 1+2
4 TX SCN Screen for 5+6
5 TX A Sensor Cable
6 TX B Sensor Cable
7 TRIGGER 0V Ground ref for Trigger inputs
8 TRIGGER D1 Digital input No 1
10 TRIGGER 5V 5 V output
16 I out Io Current output (4-20mA)
17 I out 0V Current output zero ref terminal
18 I out 24V Current output 24 V DC loop power : refer to Fig. 10
19-21 RELAY 1 NC-C-NO Relay output terminals for Relay 1
22-24 RELAY 2 NC-C-NO Relay output terminals for Relay 2
25 DC out 24V Output of 24 VDC for powering external devices.
26 DC out 0V Ref for DC output
27 DC in 24V Positive supply at 24VDC to the MSM400--ie DC power input
28 DC in 0V Ref terminal for DC supply input
29 Mains L AC power input 115/230V, Live terminal NB: SELECT 115 or 230V
30 Mains N AC power input 115/230V, Neural terminal ON SWITCH ABOVE
31 Mains E Protective Earth (PE) THESE TERMINALS
NOTE 1 The sensors are symmetrical, so either of the two cable pairs can be chosen as "Tx" or "Rx
K7941
FUSE
200mA