Endress+Hauser Promag 53 - Connecting the Measuring Unit

Promag 53 PROFIBUS-DP/-PA 4 Wiring
Endress+Hauser 53
4.3 Connecting the measuring unit
4.3.1 Connecting the transmitter
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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 (not necessary if the power supply is gal-
vanically isolated).
• Compare the specifications on the nameplate with the local voltage supply and fre-
quency. The national regulations governing the installation of electrical equipment
also apply.
Procedure (Fig. 33, Fig. 34):
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.
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Note:
The Promag 53 can also be supplied with the option of a ready-mounted fieldbus
connector. More information on this can be found on Page 56.
3. Connecting the cables:
– Wiring diagram (aluminum and stainless steel housings)
→ Fig. 33
– Wiring diagram (wall-mount housing)
→ Fig. 34
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Caution:
– The PROFIBUS cable can be damaged!
If the shielding of the cable is grounded at more than one point in plants without
additional potential equalisation, mains frequency equalisation 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 PROFIBUS not be looped using conventional cable
glands. If you later replace even just one measuring device, the bus communica-
tion for the entire bus will have to be interrupted.
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Note:
– The terminals for the PROFIBUS-PA 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
– Observe the plant’s grounding concept.
4. Screw the cover of the connection compartment (f) firmly back onto the transmitter
housing.