4 connecting the measuring unit, 1 terminal assignment, 2 transmitter connection – FMC Corporation - Talstar 80 Benutzerhandbuch
Seite 30
Wiring
Proline Promass 80 PROFIBUS PA
30
4.4
Connecting the measuring unit
4.4.1
Terminal assignment
Electrical values of the inputs
Electrical values of the outputs
4.4.2
Transmitter connection
#
Warning!
• Risk of electric shock. Switch off the power supply before opening the device. Do not install or
wire the device while it is connected to the power supply. Failure to comply with this precaution
can result in irreparable damage to parts of the electronics.
• Risk of electric shock. Connect the protective earth to the ground terminal on the housing before
the power supply is applied (not required for galvanically isolated power supply).
• Compare the specifications on the nameplate with the local supply voltage and frequency. The
national regulations governing the installation of electrical equipment also apply.
1.
Remove the cover (a) from the connection compartment.
2.
Route the power supply cable (b) and fieldbus cable (d) through the appropriate cable entries.
!
Note!
The measuring devices can also be supplied with the option of a ready-mounted fieldbus
connector. Further information:
3.
Perform wiring: wiring diagram (aluminum housing, stainless steel housing or wall-mount
housing)
→ Fig. 17.
"
Caution!
– Risk of damaging the fieldbus cable!
If the shielding of the cable is grounded at more than one point in systems without additional
potential equalization, power supply frequency equalization currents can occur that damage
the cable or the shielding.
In such cases the shielding of the cable is to be grounded on only one side, i.e. it must not
be connected to the ground terminal of the housing. The shield that is not connected should
be insulated!
– We recommend that the fieldbus cable not be looped using conventional cable glands. If you
later replace even just one measuring device, the bus communication will have to be
interrupted.
!
Note!
– The terminals for the PROFIBUS PA connection (26/27) have integrated reverse polarity
protection. This ensures correct signal transmission via the fieldbus even if lines are mixed
up.
– Conductor cross-section: max. 2.5 mm
2
– Observe the grounding concept of the plant.
– Connection values
4.
Seal the connection compartment again.
Order version
Terminal No. (outputs/inputs)
26: PA + / 27: PA – (with integrated reverse polarity
protection)
80***-***********H
PROFIBUS-PA
PROFIBUS-PA connection data
U
i
= 30 V AC; I
i
= 500 mA; P
i
= 5.5 W; L
i
= 10.0
μH; C
i
= 5.0 nF