GVC736CE101 5SXE12-0184 ABB distributed control system industrial DCS module card

Description

Packaging details: if you need an urgent delivery order, please feel free to contact us, and we will do our best to meet your needs.

Price problem: if you find that other suppliers offer cheaper prices for the same product, we are also willing to provide you with reference prices and give you further discounts.

Thanks to the new PR123 trip
unit, it is also possible to program two different sets of parameters and, through an external command, to switch
from one set to the other.
This function is useful when
there is an emergency source
(generator) in the system, only
supplying voltage in the case
of a power loss on the network
side.
In the system described below, in the case of a loss of the
normal supply on the network
side, by means of the ABB
SACE ATS021 or ATS022 automatic transfer switches, it is
possible to switch the supply
from the network to the emergency power unit and to disconnect the non-primary
loads by opening the QS1
switch-disconnector.
Under normal service conditions of the installation, the circuit-breakers C are set in order to be selective with both
circuit-breaker A, on the supply side, as well as with circuitbreakers D on the load side.
By switching from the network
to the emergency power unit,
circuit-breaker B becomes the
reference circuit-breaker on
the supply side of circuitbreakers C. This circuitbreaker, being the protection
of a generator, must be set to
trip times shorter than A and
therefore the setting values of
the circuit-breakers on the load
side might not guarantee the
selectivity with B.
By means of the “dual setting”
function of the PR123 trip unit,
it is possible to switch circuitbreakers C from a parameter
set which guarantees selectivity with A, to another set which
make them selective with B.
However, these new settings
could make the combination
between circuit-breakers C
and the circuit-breakers on the
load side non-selective.