Agilent Technologies DP111 Especificaciones descargar pdf (Pagina 175)

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Section 3 Configuration Powering Field Equipment outside the Cabinet

3BSE036351-510 A 175

To avoid the AC 800M Controller being influenced by field equipment, it is strongly

recommended that separate power supplies be installed (see Figure 50 on page 147

and Figure 51 on page 148).

Sectioning Field Equipment

If field equipment connected to an AC 800M Controller is to be sectioned into

groups – thus avoiding a power failure in one group from influencing the power to

other groups – then it is recommended to use separate power supplies for each field

equipment group.

The use of fuses in the 24 V DC distribution system is not a fail-safe measure. If a

short circuit occurs in one group, then voltage will most likely drop before a fuse

blows; consequently all groups will experience a drop in voltage.

Cable Protection

24 V DC distribution system cables must be fuse-protected. In order to allow for

overload/short circuit situations, the power supply output current is limited. Allow

the power supply an extra capacity of at least 3-4 times the rated current value of the

largest connected fuse and remember to include long cable resistance in the

calculation.

Connection Alternatives

The field equipment power supply can be connected in the same manner as that used

for connecting and powering the AC 800M units (see Figure 61 on page 177 and

Figure 62 on page 178). However, it should be noted that the same Mains Breaker

Unit can be used to control and isolate both power supplies. Alternatively,

independent Mains Breakers can be used on each spur (see Figure 62 on page 178).

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