GMV NGV A3 - Page 28

ENG
NGV A3 VALVE
INSTALLATION, USE AND MAINTENANCE
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10991483 EN -1.10 - 26.05.2023
3.4.4 MICRO-LEVELLING
The micro-levelling, using an auxiliary motor/pump group (Ma) with reduced dimensions and capacity, allows
a lower power consumption and a shorter response time, compared to the traditional levelling/re-levelling
system.
The card, with the inputs V3 and VS on the X4 connector and the output signals RUN/UP and RDY performs
the micro-levelling using the following sequence (that it’s not the standard travel sequence):
3. V3 => ON
4. VS=> ON simultaneous or delayed (compared to V3 = ON)
5. RDY => OFF
6. RUN / UP => ON ok to start the micro-levelling motor
7. VS => OFF.
8. RUN / UP=> OFF
9. RDY => ON
Off / Non alimentato
On / Alimentato
3.4.4.1 SIGNALS AND COMMANDS SEQUENCE
Start travel
sequence:
V3=ON  VS=ON  RDY=OFF – RUN/UP =ON  MP=ON
End travel
sequence:
RUN/UP =OFF  MP=OFF  VB/SM=CLOSE  RDY=ON
Ma
Motor / pomp
V3
Speed: Micro-levelling
SM
Stepping motor
VS
Upward signal
OFF
Not powered
ON
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