102 GC250 Technical Manual
EAAM057608EN
disabled even with the breaker closed. It is strongly recommendable to use the contact
normally closed
of an external relay commanded by this output, in the way that when
the controller is not supplied, the MCB circuit breaker closes (see par. 5.6.1. It is
anyway possible to directly command a battery voltage breaker, by inverting the
polarity of the output (see par.5.6.2) Use this output with the remote control switches,
not with the motorized breakers.
Four different commands are available for the
GCB
circuit breaker management,
configurable on one or more digital outputs (see par. 5.6):
DOF.2031 -
“GCB Under voltage coil”. This feature can be used to supply the minimum
voltage coil (if any) of the circuit breaker. The controller disables this output when it
must open the breaker, and enables it when it must close the breaker: the real closing
command will be activated with at least 0.5 seconds after the enabling of this output.
DOF.2032 -
“GCB opening coil”. The controller enables this output when it wants to
open the circuit breaker: the output goes back in standby once the circuit breaker
feedback indicates that it is open (or when the opening time-out expires).
DOF.2033 -
“GCB closing coil”. The controller enables this output when it wants to
close the circuit breaker (ensuring that the function DOF.2031 has been active for at
least 0.5 seconds): the output goes back in standby once the circuit breaker indicates
that it is closed (or when the closing time-out expires, or the synchronism condition no
longer exists).
DOF.2034 -
“GCB steady closing command”. The controller enables this output when
it wants to close the circuit breaker (ensuring that DOF.2031 has been active for at
least 0.5 seconds): the output stays active even with circuit breaker closed. The
controller disables this output when it must open the breaker: the output remains
enabled even with the breaker open. Use this output with the remote control switches,
not with the motorized breakers.
9.6.2
Acquiring breakers status
The features of inputs DIF.3001 -
“GCB breaker status” and DIF.3002 - “MCB breaker status”
are used by the controller for acquiring the feedback connection input, respectively of breakers
GCB and MCB. The controller uses these inputs for:
Issuing failed opening or failed closing warnings.
For its own operating sequence.
It is also used to detect the status of the circuit breaker when it is commanded by
external devices.
To view the real status of the circuit breakers on page S.01.
The delay associated to the input (P.2002 for input 1 or equivalent parameter for the other
inputs) is used as maximum time for opening or closing the breaker.
Theoretically, the controller could even work without this feedback. In this case, the controller
considers that the breaker is closed once the closing command is issued; it considers that the
breaker is open once the opening command is issued. In reality, it is always better to connect
the feedback.
9.6.3
OFF/RESET management logic
In this mode, the controller always commands the GBC in opening. If MCB exists and is
commanded by the controller, it is always commanded in closure.
9.6.4
Switching logic in AUTO mode
After detecting the mains failure condition, the controller starts the engine. After detecting the
engine running and with parameters of generator frequency and voltage in the respective
