ABB FS4000, Operating Instruction

Page: 39 / 126

Electrical connections
D184B097U02 FV4000 / FS4000 39
5.2.3 Standard design, PROFIBUS PA / FOUNDATION Fieldbus
1. A suitable bus cable must be used for the electrical connection of the transmitter.
A shielded, twisted cable is recommended (in accordance to IEC 61158-2, types A or B are
preferred).
Important
The permissible cable length in the segment, including all spur lines, is restricted to a
maximum of 1,900 m (6,324 ft). It is determined by the cable type and the type of explosion
protection (hazardous area protection). For hazardous protection, no special measures need
to be taken up to 1,000 m (3,281 ft) in accordance with the FISCO model. However, special
measures are required with regard to explosion protection for longer cable lengths.
2.
Unscrew the cover from the cable connection area at the rear of the transmitter.
Important
After switching off the supply power, wait t > 2 minutes before opening the flameproof
housing.
3.
Remove the insulation from the cable sheath, the shield and the wires as specified (see the
section titled "Cable connection area").
4. Insert the bus cable into the cable connection area through the cable gland and fasten to the
cable grip on level with the shield to prevent accidental disconnection.
5. Tighten the cable gland.
Notice - Potential damage to parts!
If the bus cable is not fastened to the cable grip, the shield will not have a functional ground.
Furthermore, there is a risk of the cable being pulled completely out of the transmitter housing
should the strain fall below the required level, thereby interrupting the electrical connection.
The sheath of the bus cable must not be damaged. Otherwise, protection class IP 67 for the
flowmeter cannot be ensured.
6.
Connect the bare wires to the corresponding terminals (see the section titled "Cable
connection area").
7. Screw on the cover for the cable connection area fully and fasten hand-tight. Make sure the
gaskets for the cover are seated properly.