90 GC250 Technical Manual
EAAM057608EN
INFORMATION!
Even with the internal sensor deactivated (that is, with P.0116=0)
the device performs and shows the mains measures, even i
f it doesn’t use them to
define its status.
The status of the mains is considered:
“Absent” if the input is no active.
“In tolerance” if the input is active.
if the input is active, the mains is considered in tolerance, even if the measure from the
internal sensor is enabled and such measure indicates that the mains is out of
tolerance.
It is valid what written in the next paragraph, as per the internal sensor.
9.2.3
Mains global status
Whichever the method used to acquire the mains instant status, to the extent of the plant
operation logics, the mains global status is described in four steps:
The use of the “mains presence delay” (configured with parameter P.0205) depends on the
presence of one or more generators supplying the loads, and on the configuration of parameter
P.0250. It is a bit-managed parameter. At the moment two bits are defined:
•
Bit 0: used when the controller is in OFF/RESET mode. In this mode, the controller
does not norm
ally manage the “mains presence delay” (to re-power the loads as soon
as possible, since they are not powered by the generators). By setting bit 0 of P.0250
to “1”, the controller manages the "mains presence delay".
•
Bit 1: used when the controller is in AUTO mode. In this mode, the duration of the
“mains presence delay” depends on the presence of generators supplying the loads,
and on the value of this bit:
o
At least one generator supplying the loads: the duration of the “mains
presence delay” is set by parameter P.0205.
o
No generator supplying the loads and bit 1 of P.0250
is “1”: the duration of the
“mains presence delay” is set by parameter P.0205.
o
No generator supplying the loads and bit 1 of P.0250
is “0”: the duration of the
“mains presence delay” is 0 seconds.
Mains in
tolerance
Delay mains
presence
Delay mains
failure
Mains out of
tolerance
Mains out of tolerance
Mains in tolerance
Mains out of tolerance
Mains in tolerance
When the time set with
P.0206
(two seconds if the
generator is "ready to
supply", 0 seconds if GCB is
already closed) has elapsed.
After the time set with
P.0205 (see notes below)
