Chapter 5 _______________________________________________ Wiring and Power Management
VAISALA_______________________________________________________________________ 55
The input power supply must be capable of delivering 60 mA (at 12 V)
or 100 mA (at 6 V) instant current spikes with duration of 30 ms. These
are drawn by the wind sensor (whenever enabled) at 4 Hz rate, which is
the default value for wind sampling. Wind sampling at 2 Hz and 1 Hz
rate is also available. See Chapter 8 Sensor and Data Message Settings,
on page 127.
Because wind measurement is the most consuming operation in the
system, the average current consumption decreases almost in proportion
to the sampling rate.
Typically, the average consumption is less than 10 mA. The higher the
voltage, the lower the current.
Heating voltage Vh+ (one of the following three alternatives):
- 12 ... 24 VDC (-10 % ... + 30 %)
- 12 ... 17 VAC
rms
(-10 % ... +30 %)
The typical DC voltage ranges are:
- 12 VDC ± 20 % (max 1.1 A)
- 24 VDC ± 20 % (max 0.6 A)
Nominally at 15.7 V heating voltage level, the transmitters
automatically change the heating element combination to reduce instant
current. The input resistance (R
in
) is radically increased with voltages
above 16 V as shown in the following graph. The average (5s) power
does not depend on the input voltage.
The recommended range for AC is:
- 12 ... 17 VACrms (-10 % ... +30 %) max 1.1 A for AC
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