Operating instructions

Dedicated pump features
1
Dry Pump Protection and
End of Curve
Dry Pump Protection and End of
Curve relate to situations where
the pump runs without creating
the desired pressure – as when a
well runs dry or a pipe leaks. In this
situation the drive sets off an
alarm, shuts off the pump, or
performs another pre-
programmed action.
2
Auto tuning of the PI
controllers
With auto tuning of the PI con trol-
lers, the drive monitors how the
system reacts on corrections made
by the drive, learns from it, and
calculates the “P” and “I” values so
that precise and stable operation is
achie ved quickly.
This applies to each PI controller in
the 4-menu sets individually. Exact
P and I settings at start-up will not
be necessary – which lowers
commissioning costs.
3
Flow compensation
Signifi cant energy savings and
reduced installation costs are
provided by fl ow compensation in
both fan and pump systems.
A pressure sensor mounted close
to the fan or pump provides a
reference enabling pressure to be
kept constant at the discharge end
of the system. The drive constantly
adjusts the pressure reference to
follow the system curve.
4
No/low fl ow
An operating pump will normally
consume more power the faster it
runs – according to a curve
determined by the pump and
application design. The VLT® HVAC
Drive will detect situations where
the pump runs fast but is not fully
loaded – and thereby not
consuming adequate power. This is
the case when water circulation
stops, the pump runs dry, or when
pipes leak.
The VLT® HVAC Drive off ers a vast
number of pump-specifi c features
developed in cooperation with OEMs,
contractors and manufacturers
around the world.
Embedded Pump
Cascade Controller
The Pump Cascade Controller distrib-
utes running hours evenly across all
pumps, keeps wear and tear on
individual pumps to a minimum and
ensures that all pumps are in great
shape.
Vital water supply
Vital water supply can be assured in
the event of leakage or a broken pipe.
For example overload is prevented
by reducing drive speed – and supply
is secured at lower fl ow.
Sleep Mode
In Sleep Mode the drive detects
situations with low or no fl ow. Instead
of continuous operation sleep mode
boosts the system pressure and then
stops to save energy. The drive starts
automatically when the pressure falls
below the lower set point.
1 2 3 4
18