Vaisala WMT700 - Manual (Page 90)

User's Guide ______________________________________________________________________
Figure 40 and Figure 41 below illustrate the wiring of heated
WMT700 instruments.
1301-018
Figure 40 Wiring of Heated WMT700 Versions, Part 1
Note that when using separate power supplies for operating and
heating, the minus (-) terminals of the power supplies are
connected together by an additional wire. Use a minimum
0.75 mm
2
wire for connecting the (-) terminals together.
1307-003
Figure 41 Wiring of Heated WMT700 Versions, Part 2
CAUTION There are two terminals connected in parallel for both positive and
negative rails of the heating voltage for the maximum current capacity. In
case the connection cable has parallel supply wires, they all have to be
connected to ensure current capacity. Leaving one terminal unconnected
or connecting it to the ground may cause a WMT700 malfunction or a
short circuit in the power supply.
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