Installation
vacon • 25
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
voltaic dimensioning is very critical. In addition to that, a blocking diode on the DC side is needed to
protect solar panels in case their voltage is low. On the AC side, function of the blocking diode is
made by drive rectifier diodes. However, in case of malfunction of rectifier diodes also electrome-
chanics separation is needed in case AC supply goes down. It is mandatory to separate the drive
from AC supply in case of power down. There are different methods to make the separation. See
one example in chapter 3.8.3.3.
3.10.3.3
Automatic Dual supply control
This functionality can be used by activating the drive relay output to control additional contactor on
the AC supply side. See the related programming in chapter 7.2.23.3. The functionality can have
three different operation modes:
0 - Always active (supply from AC and DC used together)
Works in the same way as described in chapter 3.8.3.2, but AC supply is only used when the drive is
at Run state.
1 - Closed loop Irradiation
Controls the AC supply contactor based on irradiation measurement on analog input.
2 - Closed loop Sensorless
Controls the AC supply contactor based on periodic PV capacity checks.
In this case, the AC contactor can also be used to separate the drive from mains automatically when
the AC supply goes down. For this, it is mandatory to have a separate control relay on the AC side
to detect supply voltage. This relay can be used to force contactor to switch off. The contactor aux-
iliary contact should be connected into the drive digital input configured in P3.5.1.60, to tell contac-
tor status.
3.10.4
Overvoltage category
The overvoltage category of the AC drive is Category III.
3.11
Ex24 V supply
Using external supply can be used to keep control energized when mains power is down. System
software version FW0072V030 or newer should be used.
