ABB DO630 Analog module industrial system controller

Description

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It appears that DTC drives are most advantageous for high performance
or demanding drive applications. What benefits does DTC bring to
standard drives?
Standard applications account for 70 percent of all variable speed
drives installed throughout industry. Two of the most common
applications are in fans and pumps in industries like heating, ventilating and air conditioning ( HVAC), water and food and drinks.
In these applications, DTC provides solutions to problems like
harmonics and noise.
For example, DTC technology can provide control to the drive
input line generating unit, where a conventional diode bridge is
replaced with a controlled bridge.
This means that harmonics can be significantly reduced with
a DTC controlled input bridge. The low level current distortion
with a DTC controlled bridge will be less than a conventional
6-pulse or 12-pulse configuration and power factor can be as
high as 0.99.
For standard applications, DTC drives easily withstand huge and
sudden load torques caused by rapid changes in the process,
without any overvoltage or overcurrent trip.
Also, if there is a loss of input power for a short time, the drive
must remain energised. The DC link voltage must not drop below
the lowest control level of 80 percent. To ensure this, DTC has
a 25 microseconds control cycle.
What is the impact of DTC on pump control?
DTC has an impact on all types of pumps. Because DTC leads
to a universal drive, all pumps, regardless of whether they are
centrifugal or constant torque type (screw pumps) can now be
controlled with one drive configuration, as can aerators and
conveyors. DTC technology allows a drive to adjust itself to
varying application needs.
For example, in screw pumps a drive using DTC technology
will be able to adjust itself for sufficient starting torque for a
guaranteed start.