InteliMains
NT
, SW version 3.2.0
InteliMains-NT-MCB-MGCB-3.2.0-Reference Guide.pdf,
©ComAp – April 2015
132
7.30 System Isolated
There are two logical binary inputs that can be used as feedbacks from secondary circuit breakers that
isolated the system in case there is primary CB failure. If MCBIsolated or MGCBIsolated gets active,
the controller will consider the corresponding breaker to be opened regardless of the position of
feedback (and feedback negative).
The example of this function is described below:
The system is in normal operation. The load is connected to the Mains via MCB and MGCB is opened.
Mains fails and the controller tries to open MCB. It does not open (because of faulty breaker or
feedback). MCB fail alarm is issued and the controller does not start gen-sets since there is direct
connection to the faulty Mains (to prevent connection of gen-sets to the faulty Mains). Automatic
sequence (or the operator) opens the secondary (emergency) breaker that is next to the MCB. Its
feedback is configured on the function MCBI
SOLATED
. When this input gets activated (negative logic)
the MCB is considered opened and the controller starts gen-sets, closes MGCB and the load is
powered again.
W
ARNING
!
Be aware that when there is a faulty breaker (or even feedback only), such situation needs to be
resolved carefully and only emergency run of the equipment should be allowed.
To recover from this state you should always repair or replace faulty circuit breaker or feedback and
then recover the system completely. Before closing of the secondary breaker the primary breaker
must be always opened to prevent hazardous closing of two voltages out of synchronization.
7.31 User Mask function
In GenConfig you can easily set any object in Screen Editor to show or hide based on activation of
particular Logical Binary Input available for users. Below, there is diagram showing the setup of User
Mask function in Screen Editor.
