Operating instructions

Protect PV.600/800 OD Series - Operating Instructions
8000041160 BAL Page 39 of 100
5.2 Input Current Measurement System (Optional)
The DC input current is measured using one current transformer
for each DC input. The measurement results are made available to
all CAN interfaces in the network, such as the MCC MultiCom in-
terface or the display and operation unit. Internal and external
monitoring units such as data loggers or SCADA systems, which
communicate with the Protect PV via Modbus, can analyse the
measured values using their own algorithms and output a warning
if a fault is detected. This means that any faults in the GCBs are
detected early and the PV module zone is monitored.
There is an optional web server available for monitoring the input
currents from the GCBs in cases where the Protect PV. is being
used as a stand-alone device.
5.3 Ventilation
5.3.1 Fan Control
The Protect PV.xxx-OD has three fan control units for the cabinet,
IGBT stack and air recirculation fans.
The control unit for the cabinet and IGBT stack ventilation is tem-
perature-dependent and is controlled variably. After the inverter is
restarted, the fan control unit always starts the fans at the highest
with the highest fan stage.
Therefore, there is no need to wait for any switching criteria (tem-
perature) for a function test after maintenance work. The fans are
always active in the highest fan stage for a certain time. After this,
the IGBT stack and unit exhaust air temperature are checked. If
the highest temperature of the two sensors is below the limit value,
the fans switch to a slower fan stage.
The temperature is checked continuously in all fan stages. If the
highest temperature value of the two sensors is below a limit val-
ue, the fans are turned down or switched off. If the temperature
rises again during operation with a lower fan stage or while the
fans are switched off, the fans are switched on or turned up.
Air recirculation control depends on the feed operation into the
mains. The fans always run in the fastest fan stage during feed
operation. When the inverter is no longer feeding in, the fans run
on for a certain time for cooling purposes and are then switched
off.
Fan control:
Extends the operating times of the fans
•
Reduces the noise generated by the fans •
Improves the efficiency of the equipment by reducing its •
power consumption
5.3.2 Cabinet Fan Parameters
The variable fan speed is determined linearly using an x-y charac-
teristic curve of the relevant measured temperature.