Wilo LON Betriebsanleitung Seite 58

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The nvoPumpCapacity output network variable then indicates the current actual
sensor value as a percentage of the maximum value of the sensor range.
The nvoPressure output network variable always provides the actual differential
pressure value determined internally by the pump, which may vary from the
sensor value. This is used to analyse the system behaviour. The differential
pressure setpoint is still preset via the nviPumpSetpoint input network variable if
the nviRemotePress network input variable is used.
If an invalid value is sent to the nviRemotePress input network variable or no value
has been received for longer than defined in nciRcvHrtBt, the pump returns to
internal control and the control mode defined in nciControlMode.
The overriding nviOvdSpeed setpoint input also overrides the control with
external sensor.
nviRemotePress has priority over nviRemoteTemp.
Caution: To ensure stable control, nviRemotePress must be sent every 3 s.
Even in this case, stable control of all pump types cannot be ensured however.
Value range
-3276.8 – 3276.6 kPa (in 0.1 kPa steps). 3276.7 kPa is an invalid value.
Default value: 3276.7 kPa.
Remote temperature sensor input
network input SNVT_temp_p nviRemoteTemp
This optional input network variable allows an external temperature sensor
to be used to control the pump. If a valid value is received, the pump
automatically switches to temperature-dependent differential pressure
control mode. Control by means of an external sensor is indicated in the
nvoPumpStatus.pump_ctrl.remote_temp network variable.
The nvoPumpCapacity output network variable then indicates the current
actual sensor value as a percentage of the upper limit of the sensor range. If an
invalid value is sent to the nviRemoteTemp input network variable or no value
is received for longer than defined in nciRcvHrtBt, the pump returns to internal
control and to the control mode defined in nciControlMode.
The overriding nviOvdSpeed and nviOvdPress setpoint inputs also override
control by means of an external sensor.
nviRemotePress has priority over nviRemoteTemp.
Value range
-273.17 ... +327.66 °C (in 0.01 °C steps). 327.67 °C is an invalid value.
Default value: 327.67 °C.
52 WILO AG 04/2007