Endress+Hauser Proline Promass 83, Operating Instructions Manual, Page: 28 / 118

4 Wiring Proline Promass 83 FOUNDATION Fieldbus
28 Hauser
4.3 Connecting the measuring unit
Field instruments can be connected to the FOUNDATION Fieldbus in two ways:
• Connection via conventional cable gland
→
Section 4.3.1
• Connection using prefabricated fieldbus connector (option)
→
Section 4.3.3
4.3.1 Connecting the transmitter
#
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 the electronics.
• Risk of electric shock. Connect the protective conductor to the ground terminal on the housing
before the power supply is applied.
• Compare the specifications on the nameplate with the local voltage supply and frequency. The
national regulations governing the installation of electrical equipment also apply.
1. Remove the cover (f) of the connection compartment from the transmitter housing.
2. Feed the power supply cable (a) and fieldbus cables (b) through the appropriate cable entries.
!
Note!
The Promass 83 can also be supplied with the option of a ready-mounted fieldbus connector.
More information on this can be found on Page 31.
3. Connecting the wiring:
– Wiring diagram (aluminium housing)
→
Fig. 17
– Wiring diagram (stainless-steel housing)
→
Fig. 18
– Wiring diagram (wall-mount housing)
→
Fig. 19
"
Caution!
– Do not damage the fieldbus cable!
If the shielding of the fieldbus cable is grounded at more than one point in systems without
additional potential equalisation, network frequency equalisation currents can occur that
damage the cable or the shielding.
In such cases the shielding of the fieldbus 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 connec-
ted should be insulated!
– It is not recommended that the fieldbus be looped using conventional cable glands. If you
later replace even just one measuring device, the bus communication for the entire bus will
have to be interrupted.
!
Note!
– The terminals for the fieldbus connection (26/27) have an integral polarity protection. This
ensures correct signal transmission via the fieldbus even if lines are confused.
– Conductor cross-section: max. 2.5 mm
2
– Between the stripped fieldbus cable shielding and the ground terminal “d”, the cable shiel-
ding should not exceed a length of 5 mm
4. Screw the cover (f) of the connection compartment firmly back onto the transmitter housing.