18 GC310, GC350, GC500, GC500Plus and GC500Mains User’s Manual
Press the ACK/ENTER button to enable mode. A menu will guide you through the selection of the
required function.
3.5
Plus Mains
3.5.1
WARNING: Before proceeding with manual synchronization, check the configuration is
set so the circuit breaker cannot close in the case of a phase speed alignment error.
Selecting MAN mode by pressing theUP Ref. 1b and DOWN Ref. 1b buttons allows you to control
closing of GCB via manually assisted syncronization (depending on plant's type).
In MAN mode, with engine ON, generator and mains/bus bar voltage active, (BUS LIVE light steady ON),
pressing the button related to the open GCB will enable the function.
When the button is pressed, the circuit breaker will not close, but the manual SYNCHRO function is activated
and synchronization page B.02 is automatically displayed.
Press the ACK/ENTER button to manually adjust engine speed and/or voltage and the LEFT
and RIGHT buttons to select either speed or voltage adjustment; press the UP
Ref. 1a and DOWN Ref. 1a buttons to modify percentage value (%). When the synchronoscope
detects that the circuit breaker can be closed, press the GCB button again and hold it down until the
circuit breaker has closed.
At any time, pressing EXIT/SHIFT disables the speed manual controls and allows page changing.
Changing the page aborts the manual synchronization procedure.
Note: The function described can only be used if the system hasn't been configured to use an external
potentiometer to adjust the speed; in this case the speed can only be changed using the potentiometer.
Make sure that after the circuit breaker closes, the requested speed is set as close as
possible to the nominal value so that Gen-set can properly adjust the power.
3.5.2
Warning: As some slow power ramps may have been set, check the command against the “Power
reference” value shown in the same page and not against the value of the power actually produced.
In mains parallel applications with BASE LOAD or IMPORT/EXPORT functions, you can adjust the power
supplied manually without having to change the parameter that defines the regulated power directly.