FOXBORO FCP280 RH924YA processor

FOXBORO FCP280 RH924YA processor

Technical data of product parameters

If field equipment connected to an AC 800M Controller is to be sectioned into FCP280 RH924YA
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 FCP280 RH924YA
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
calculationThe 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 FCP280 RH924YA
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 (The AC 800M Controller can be powered from an external +24 V DC source. This
source is often common for many different types of plant equipment, resulting in
long power cables to the AC 800M Controller. Furthermore, heavy load changes can
cause variations in controller supply voltage making it necessary to take precautions
against low voltage in order to prevent controller malfunction

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