Solar pump application vacon • 127
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
10
10.7 Grounding
10.7.1 Pole Grounding
It is prohibited to connect any pole, DC+ or DC-, of the photovoltaic system directly to PE.
10.7.2 Drive Grounding
All non-current-carrying metal parts (module frames, enclosures) and also the midpoint of the cur-
rent carrying conductors of the photovoltaic system must be connected to the PE of the drive.
10.8 AC grid connection
10.8.1 More than one source of supply
It is not allowed to supply the drive simultaneously from photovoltaic cell and from grid.
10.8.2 Toggle between AC and DC
If both the DC input and the AC input are used (e.g. in case of not sufficient energy from the photo-
voltaic system) it is not allowed to switch directly between AC and DC supply. When switching from
one supply to the other it is mandatory to wait until the drive is discharged. The discharge time and
subsequently the minimum delay to switch between the supplies is 30 seconds.
Minimum AC-DC switchover delay = 30s.
10.9 External +24V supply
It is not supported and not allowed to supply the control-board with external +24V when the drive is
connected to a photovoltaic source (DC-supplied drive).
Danfoss recommends to use a two-pole disconnect switch as well for photovoltaic input (suit-
able for DC) as for grid input (AC switch) to completely isolate the equipment. Only one of these
switches is allowed to be on at a time and delay time must be respected when changing from
one switch to the other.
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