GeoDesy FSO GD series - Manual (Page 76)

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9.5 48 VDC Power supply connections
In fact the 48VDC power supply is optional; the connection is almost the same. In
the case of the 48VDC power supply it is important to pay attention to the polarities.
In this type of ODIU you can find fuses only on the primarily side of the
transformer.
Type PINTO PRONTO
fuse T6,3A(250V) T6,3A(250V)
In this case you should connect your negative 48V point to the N point of the OIU,
and your GND should been connected to the P point.
In this case you have the 3 poles connector for the head power supply for every type
of heads. So the connecting order is as follows, which must be followed:
Color coding Pinto:
Color coding Pronto:
Not connected
Red positive
Green-Yellow GND
Black negative
Not connected
Green positive
Twisted:
orange-White,
Green-White
GND
Orange negative
The wrong polarity of
the cables can damage
the power supply.