1.2.3 Ready-Installed Intelligence
The function of machinery and applications is typically tested at the suppliers. Machines are built, tested, calibrated and taken apart for transportation.
The process of rebuilding the application at the production site is considerably simplified by shipping it in modules with built-in motor controls, as rewiring
and testing is time consuming and calls for skilled personnel. Using ready-installed, decentralised installations reduces both time and risk as wiring for
motor, control and sensors are already in place and maintained during transportation. The need for highly skilled experts is reduced and local labour can
do a larger part of the installation. The commissioning costs and OEM resources on-site will be reduced.
1.2.4 Improved EMC
Electrical noise emitted is proportional to cable length. The very short - or eliminated - cable between motor control and motor in decentralised installations
therefore reduces emitted electrical noise. In decentralised installations, the machine builder normally mounts cables between motor controls and motors
in the machine leaving only power cables and fieldbus cables with no EMC emission to be installed at the production site. The risk of electrical noise from
motor controls to disturb other electrical equipment caused by a faulty installation will diminish and you avoid time-consuming fault finding in the com-
missioning phase, where time frame is tight.
1.2.5 Adapts to Standard and Special Motors
The FCD 300 is designed to control standard AC asynchronous motors.
Its flexibility allows it also to adapt to special motor types. An example is
the AMT feature (Automatic Motor Tuning). Combining Danfoss frequen-
cy converters to Danfoss geared motors makes it even easier as they fit
mechanically and the motor data are already stored in the FCD 300 mem-
ory. Combined motor-drives are provided pre-assembled directly from
Danfoss removing the need for mechanical fitting between motor and
control.
Illustration 1.7: Danfoss geared motor with FCD 300
1.2.6 Minimum Thermal Losses
Danfoss frequency converters feature the unique Voltage Vector Control (VVC) switching principle to generate motor voltages. Due to the VVC principle,
power losses in the motor are similar or less than the losses in a motor connected to mains. Thermal losses are minimised and overheat is prevented. At
the same time, the VVC principle ensures nominal torque at nominal speed and eliminates bearing currents.
1 The Decentral Concept
VLT
®
Decentral FCD 300 Design Guide
10
MG.90.S1.02 - VLT
®
is a registered Danfoss trademark
1