If the pressure exceeds the set limit, this is when the force generated by pressure against the
annulus (the membrane surface minus the surface of the small ball contact) is higher than the
force generated by the spring, the small ball will lift and release gas under pressure into the
atmosphere.
The pressure in the bellows will then drop and the main valve will open.
Due to the pressure drop, the control valve will close (and the release of gas into the atmosphere
will stop). The pressure in the bellows will rise again and the main valve will close again.
Controlled blow-off valve
The unit can be unloaded by a solenoid valve. If the solenoid is activated, chamber X is
depressurized and the pressure in the bellows is relieved.
Pressure control mode
If the unit is operating in pressure control mode, the motor speed is adapted in function of the
pressure set point. The pressure in the air net is varying in function of the air consumption.
If the air consumption has been decreased until the motor speed can not be reduced any further
and if the air consumption will further be reduced, the pressure in the air net will rise up to the
indirect stop level (set value), the unit will be unloaded. If the unit stays unloaded for a certain
period of time (set value), the unit will stop. The machine will start again if the pressure in the air
net decreases below the pressure set point.
In case the net pressure should rise to the direct stop level (set value), the blower will be stopped
immediately. The machine will start again if the pressure in the air net decreases below the
pressure set point.
Speed control mode
If the unit is operating in speed control mode (e.g. 4-20 mA) in order to control the air volume
flow, the motor speed is adapted to the requested speed set point.
If the pressure in the air net will rise up to the indirect stop level (set value), the unit will overrule
the requested speed set point, slow down to minimum speed and go unload. If the pressure is
above the indirect stop level and again below within a predefined time (set value), the unit will go
loaded again after the predefined time and follows the requested speed set point.
The unit will stop after the predefined time if the pressure is still above the indirect stop level. If
the pressure drops below the indirect stop level, the unit will be loaded again.
Instruction book
16 AIF999999
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