118 GC315xx and GC400xx Technical Manual
Note: some of these setpoints could be acquired be the analogue inputs: in this case,
on this page they are displayed as well, but it is no possible to modify them though.
This page shows the necessary information for the synchronization.
The phase difference is shown through a horizontal bar, which performs as a synchronoscope.
It normally shows the phase angles between -180° and +180°. When the phase error goes
under 20°, the bar is reduced to show angles between -20° and +20° (in this case the bar is
shown in reverse).
Below the bar 5 small rectangles are shown. The first 3 indicates if the voltage, frequency and
phase differences allow the closure of the breaker (if the rectangle is empty the difference is
too high and the breaker can not be closed). The forth shows an eventual discrepancy of the
rotation direction of the phases (also in this case the empty rectangle indicates that the breaker
can not be closed). When the first four rectangles are all full, the status of the system is correct
for the closure of the breaker: the fifth rectangle becomes therefore full and the controller
commands the closure of the breaker.
To the page bottom there are the “stand-by” values for the two regulators or, in alternative, the
voltage and frequency setpoints (it depends on the configuration of the controller and on the
status of the plant). If the values are not connected to an analogue input, it is possible to modify
them directly from this page (see previous paragraph). In this way it is possible to perform a
manual synchronization.
If the voltage/frequency references can not be modified manually, if you press SHIFT the
controller displays the current value of the regulation commands (of frequency and voltage, in
%) instead of the references (it shows them in reverse, to recognise them from the references.
This page shows the useful information when the generator is in parallel with the mains or with
other generators. The active, reactive power and the power factor are shown. Are also shown
the currents, the average voltage and the frequency of the generator.
To the page bottom there are the power setpoints of active power and of power factor used
by the controller when it is in parallel with the mains. If such setpoints are not connected to an
analogue input, it is possible to modify them directly from this page (see precious paragraph).
If the parallel with the mains has not to be done, instead of these setpoints the values of “stand-
by” for the two regulators are displayed, or in alternative, the setpoints of voltage and frequency
(it depends on the controller configuration and on the status of the plant).
The engine related measurements are shown in this mode. The number of pages and the
display of some parameters may depend on the type of engine (J1939, MTU or without
communication interface). You can scroll through the various pages using the LEFT and
RIGHT buttons.
It contains the fundamental measurements for engine management:
Engine Oil pressure
Coolant temperature
Engine speed
If any of these values is not available, it’ll be shown with dashes. If a CAN-BUS connection is
active, the type of engine selected is also displayed.