See also signal flow chart in parameter group
AP-2# No-
Flow Detection
.
There are 3 different ways of using the sleep mode
function:
Illustration 3.40 Sleep Mode Function
1) Systems where the integrated PI controller is used for
controlling pressure or temperature, for example boost
systems with a pressure feedback signal applied to the
frequency converter from a pressure transducer. Set
parameter H-40 Configuration Mode
for
[3] Closed Loop
and
configure the PI controller configured for desired reference
and feedback signals.
Example: Boost system.
Illustration 3.41 Boost System
If no-flow is detected, the frequency converter increases
the setpoint for pressure to ensure a slight overpressure in
the system (boost to be set in
The feedback from the pressure transducer is monitored,
and when this pressure has dropped with a set percentage
below the normal setpoint for pressure (P
set
), the motor
acccel again and the pressure reaches the set value (P
set
).
Illustration 3.42 Boost System
2) In systems where the pressure or temperature is
controlled by an external PI controller, the wake-up
conditions cannot be based on feedback from the
pressure/temperature transducer as the setpoint is not
known. In the example with a boost system, desired
pressure P
set
is not known. Set
to
[0] Open Loop
.
Example: Boost system.
Illustration 3.43 Boost System
Parameter Description
130
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DET-620D
3
3
