Endress+Hauser Stamolys CA71NO, Operating Instructions Manual

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Wiring
16
!
Note!
• Alarm values 1 and 2 do not need to be connected if the PLC sets its own alarm values at the
analog output.
• When using a sample conditioning system:
Connect terminals 57 and 53 on the analyser to the corresponding terminals on the sample
conditioning system. For the allocation of these terminals, please see the sample conditioning
system operating instructions.
• If there is a 24 V voltage at terminal 57, the analyser will not begin measurement (sample not
ready). To start measurement, the voltage must stay at 0 V for at least 5 seconds.
4.2 Signal connection
4.2.1 Screening of the analog outputs
The interference suppressor attenuates electromagnetic effects on control, power and signal lines.
After the connection of the data transfer cables clip the interference suppressor (in scope of delivery)
on the cable cores (not on the outer insulation of the cable!). Place the cable screen out of the
interference suppressor and connect it to PE (brass screw with bolt, top right in the connection
compartment) (
→
å
15).
!
Note!
With the two-channel version, place the cable cores of all cables (data cables to analog output 1 and
to analog output 2) through the interference suppressor.
Analog output 2
0/4 ... 20 mA
+ – 39
– – 38
Screen – PE
1
Sample conditioning
remote control
Input 57 57
0 V 53 53
Channel switch-over
Input – 55
0 V – 53
1) Brass screw with bolt top right in the connection compartment (marked with
*
)
Function Designation Terminal one channel Terminal
two channels
a0001746
Fig. 15: Interference protection of the signal cable
1 Cable screen (to PE )
2 Signal cable
3 Interference suppressor
4 Cable cores of the signal cable
1 2
3
4