Fimer PVS-175-TL - Energy Save Mode and Communication

FIMER_PVS-175-TL A.1 Version_Product manual_EN_RevC-
F
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Precharge board allows to recharge PVS-175-TL internal bulk capacitors from AC grid side: so doing,
inverter is able to connect to the grid even during night-time when no DC voltage is available from PV
panels side. The main advantage related to this feature is the possibility to realize night reactive power
production when it is desired, i.e. night-reactive power on-demand. Most common examples of night-
reactive power on-demand are:
1. Night-time reactive power demand after inverter disconnection;
2. Recovery from AC grid disconnection during night-reactive power;
3. Round scheme night-reactive power.
Inverters with precharge board are also able to satisfy immediately to request of night reactive power
that arrives during the night with the ac grid interface contactors opened, since this board provides
the capability to restore the grid connection.
Precharge board can also provide the possibility to restablish normal operation when a grid fault
provokes disconnection of the inverter. For example, during night time, when inverter is in night
reactive power mode, if AC voltage dip occurs, inverter disconnects from the grid. For inverter with
precharge board installed, night reactive power can be restablished also after grid dips.
WARNING – B Inverters equipped with precharge board are not provided with full protection
against shock hazard. Therefore inverters must be installed in a closed electrical operating
area (behind the fences), with access limited to qualified personnell.
WARNING – B By external commands or by dedicated Web User Interface (UI), night-time
reactive (Q -fix Mode or Volt/Var Mode) power can be enabled or disabled and night-reactive
power mode and set-point can be modified.
Thanks to smart microcontroller supervision, when night comes, i.e. input voltage falls below
disconnection threshold, inverter enters automatically night mode seamlessly: thus ac disconnection
doesn’t occur in this case and inverter passes immediately from day to night operation.
NOTE – D This section below describes the operation of PVS-175 without precharge board.
PVS-175 models without Precharge board can anyway produce reactive power during the night but
with some limitations since the dc link bulk capacitor precharge board is not present. In this case,
night reactive power is possible only if the request comes during the day and before inverter
disconnection from grid when Sun falls. In case of grid disconnection during the night, without
precharge board, this fault can’t be solved since it is not possible to restore grid connection.
Also without precharge board it is possible to operate through the same commands to define night
reactive power mode and related setpoint.
Night Reactive Power Mode tab allows to select the desired mode.
Energy Save Mode
Energy Save Mode function is provided as an additional function in all the inverter models.