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GC315xx and GC400xx Technical Manual 145

to define voltage status: this allows not to switch the loads on the generator if the electrical

magnitudes are out of the tolerance band, even though protections are disabled.

For general management purposes, generator operation can be described in three steps:

a) Steady out of tolerance: the generator voltages and/or frequency status must be

continuously other than “In tolerance” for two seconds.

The “GENERATOR LIVE” lamp is Off if voltages and frequency are in “Absent” status,

otherwise it blinks.

b) Steady within tolerance: generator's voltage and frequency global status must be

“within tolerance” for at least 0.5 seconds. “GENERATOR LIVE” lamp is steady On.

c) Transient: shifting from status “a” to status “b” or vice versa. The “GENERATOR

LIVE”lamp blinks. On the front panel only status “a”, “b”, and “c” are displayed, by

means of the “GENERATOR LIVE” lamp. Global and individual voltage phases and

frequency “Absent” status etc. are not shown: however, they can be read with ModBus

protocol via the serial port.

The controller records any change of the generator's status in the events log, if it is enabled

with bit 2 of the P.0441 parameter:

 EVT.1020: Lack of voltage on the generator.

 EVT.1021: Generator voltage present, but “out of tolerance”.

 EVT.1022: Generator voltage present and “within tolerance”.

The following feature for the configuration of the digital outputs related to the generator status

is also available:

 DOF.3032 - “Generator in thresholds”. The controller activates this output when the

generator voltages and frequency are within tolerance from the time configured.

In addition, the controller makes available the generator statuses for the AND/OR logics by

means of the following internal statuses:

 ST.024 - "Generator voltage/frequency present"

 ST.025 - "Generator out of tolerance or absent"

 ST.026 - "Delay for generator within tolerance"

 ST.027 - "Generator within tolerance"

 ST.028 - "Delay for generator out of tolerance or absent"

In AUTO mode, whatever the kind of plant and the Mains status, two causes can anyway

inhibit the genset automatic start:

 Operating time range.

 Digital input.

 Only for GC400x: for the load management (the gensets running are enough to

supply the load). See [12].

 Only for GC400x: another genset connected to the parallel bars is in “GCB not open”

condition. See [12].

Sices GC315 User Manual

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