Principle - Deif CGC 400 Reference Book

CGC 400 DRH 4189340786 UK Additional functions
A load time setpoint for the GB/TB and MB control for breakers with no feedback indicating that the spring is
loaded. After the breaker has been opened, it will not be allowed to close again before the delay has expired.
The setpoints are found in menus 6230, 7080 and 8190.
2. Digital input
Two configurable inputs to be used for feedbacks from the breakers: One for GB/TB spring loaded and one
for MB spring loaded. After the breaker has been opened, it will not be allowed to close again before the con-
figured inputs are active. The inputs are configured in the PC utility software. When the timers are counting,
the remaining time is shown in the display.
If the two solutions are used together, both requirements are to be met before closing of the breaker is al-
lowed.
Breaker LED indication
To alert the user that the breaker close sequence has been initiated but is waiting for permission to give the
close command, the LED indication for the breaker will be flashing yellow in this case.
If the breaker needs time to reload the spring after it has opened, then the CGC can take this delay into ac-
count. This can be controlled through timers in the CGC or through digital feedbacks from the breaker, de-
pending on the breaker type.

7.4.1 Principle

The diagram shows an example where a single CGC in island mode is controlled by the AUTO start/stop in-
put.
This is what happens: When the AUTO start/stop input deactivates, the GB opens. The AUTO start/stop is
reactivated immediately after the GB has opened, e.g. by the operator through a switch in the switchboard.
However, the CGC waits a while before it issues the close signal again, because the spring load time must
expire (or the digital input must be activated - not shown in this example). Then the CGC issues the close
signal.
GB closed
GB open
Auto Start/stop ON
Auto Start/stop OFF
t [sec]
Spring load time
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