2.2. Setting up tanks
14
l PWM setting: Sets the pulse width modulation. Lowering this
number reduces the voltage supplied to the valve, slowing it
down.
l Auto close valve time (NH3 only):If flow is detected after a user
settable time (in seconds) when the tank should be off, the
regulator valve will be driven shut. This is a safety precaution for
NH3 systems using a dump valve to turn the tank off. If the
dump valve fails, this provides a back up to ensure that no gas is
discharged.
Pressure settings
l Pressure sensor: Use this option if a liquid pressure sensor is
fitted to this tank.
l Max pressure: Sets the maximum pressure for the voltage
pressure sensor.
l Min voltage: Sets the minimum output voltage at zero pressure.
This value is read from the pressure transducer.
l Max voltage: Sets the maximum output voltage at maximum
pressure. This value is read from the pressure transducer.
Pump sense
l Speed monitoring: Enables pump speed monitoring.
l Pulses/revolution: Sets the number of pulses per revolution for
the pump speed monitor.
Proportional valve drive
A proportional valve (P valve) controls the hydraulic oil flow to the
motor to vary the speed of the motor so that the metering unit is only
delivering what is required. It uses a solenoid to open a hydraulic
valve to drive a hydraulic motor. The opening of the valve varies
with the current applied to the solenoid.
Control settings
l Add dither: Enabling dither adds a small amount of current to
the solenoid of the P Valve, resulting in slight vibrations. This
prevents magnetism or sticking of the valve.
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