VLT
®
6000 HVAC
13
MG.60.B1.02 - VLT is a registered Danfoss trademark
Introduction to
HV
AC
Good torque control properties, smooth transition to
current limit operation and robust pull-out protection
are ensured.
After automatic motor adaptation, VVC
PLUS
will help to
ensure extremely accurate motor control.
Because of the good load estimation achieved, an
energy optimisation algorithm can be integrated - one
that is effective regardless of the load characteristic.
Advantages of the V V C
PLUS
control system:
-
Good compensation for step loads
-
Great tolerance towards varying motor
charateristics
-
Controlled transition from normal operation to
current limit operation (and vice versa)
-
Quick response from speed reference to full motor
shaft torque
-
Reliable pull-out torgue protection throughout the
speed range, also in the case of field weakening
-
Torque control, comprising control of both the
torque-generating and the magnetising
component of the current
As standard, VLT 6000 HVAC comes with a number
of integral components that would normally have to
be acquired separately. These integral components
are space-savers that simplify installation, since VLT
6000 HVAC fulfills most requirements without any
additional components.
The use of a VLT 6000 HVAC offers the following
additional advantages:
-
All unit types are available with an integral RFI
filter, complying with EN 55011 class 1-A in the
case of a 150 m screened/armoured motor cable
and EN 55011 class 1-B in the case of a
screened/armoured motor cable up to 50 m long.
-
Detachable LCP control panel with Hand-Off-Auto
buttons and a graphics display of local speed.
-
Automatic Motor Adaptation (AMA) ensures
optimum motor performance.
-
Integral PID regulator with option of connecting
two feedback signals (in connection with zoning),
as well as setting of two set-points.
-
Sleep mode, which automatically turns the motor
off, e.g. when there is no need for more pressure
or flow in a system.
Programmable control inputs and
signal outputs in four Setups
VLT 6000 HVAC uses a digital technique which
makes it possible to program the different control
inputs and signal outputs and to select four different
user-defined Setups for all parameters.
For the user, it is easy to program the required
functions by means of the control panel on VLT 6000
HVAC or via serial communication.
Protection against mains interference
VLT 6000 HVAC is protected against the transients
that occur in the mains supply, e.g. when switching
power factor correction or if fuses blow when
lightning strikes.
The rated motor voltage and full torque can be
maintained all the way down to 10% undervoltage in
the mains supply.
Minor interference on mains
Since as standard the VLT 6000 HVAC features
intermediate circuit coils, there is only a small amount
of harmonic mains supply interference. This ensures a
good power factor (lower peak current), which
reduces the load on the mains installation.
-
The "flying start" function enables the unit to
catch a rotating fan.
-
Automatic ramp up/down to ensure that the
VLT 6000 HVAC will not trip during acceleration
or deceleration.
-
All standard units have three integral, serial
protocols - RS 485 FC protocol, Johnson’s
Metasys N2 and Landis/Staefa FLN.
Communication option cards that can be
connected are LonWorks, Profibus for the VLT
6000 HVAC.
