Connecting The Measuring Unit; Connecting The Transmitter - Endress+Hauser PROline prosonic flow 93 Operating Instructions Manual

4 Wiring
#
48
4.3

Connecting the measuring unit

4.3.1

Connecting the transmitter

Warning!
x 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 the electronics.
x Risk of electric shock. Connect the protective earth to the ground terminal on the
housing before the power supply is applied (not necessary if the power supply is
galvanically isolated).
x Compare the specifications on the nameplate with the local supply voltage and
frequency. The national regulations governing the installation of electrical equipment
also apply.
Procedure (Fig. 49):
1. Remove the cover of the connection compartment (f) from the transmitter housing.
2. Feed the power supply cable (a) and PROFIBUS cable (b) through the appropriate
cable entries.
!
Note!
Prosonic Flow 93 can also be supplied with the option of a ready-mounted fieldbus
connector. More information on this can be found on Page 50.
3. Wiring:
Wiring diagram (wall-mount housing) o Page 49
"
Caution!
– The PROFIBUS cable can be damaged!
If the shielding of the cable is grounded at more than one point in systems without
additional potential equalisation, a mains frequency equalising current can occur
that damages 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 PROFIBUS 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 an integral reverse
polarity protection. This ensures correct signal transmission via the fieldbus even
if lines are confused.
– Conductor cross-section: max. 2.5 mm
– Observe the grounding concept of the plant.
4. Screw the cover of the connection compartment (f) firmly back onto the transmitter
housing.
PROline Prosonic Flow 93 PROFIBUS-DP/-PA
2
Endress+Hauser