Chapter 1 Overview of Parallel Control Parallel Control Solution
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1-1 Overview of Parallel Control
The parallel solution model is suitable for AC motor drives with the same power of 220kW and above
(C2000 Plus, C2000-HS and C2000-R). It addresses the need for capacity expansion in high-power
control by enabling internal communication between two AC motor drives (master/ slave) for parallel
expansion control. This solution integrates optical fiber communication and system codes to ensure
effective parallel control.
In parallel application, due to communication limits, the carrier wave can only reach up to 6 kHz, and the
current specification should take 8% derating coefficient (multiplied by 0.92) into consideration when
selecting AC motor drive models.
Delta’s high-power frequency conversion solutions are divided into two categories:
⚫ Considers 8% derating coefficient (multiplied by 0.92) when selecting AC
motor drives.
⚫ The length of the powering wire from the mains power supply to the drive
must be consistent.
⚫ Due to the different input impedance, circulating current will be generated
between some drives. It is necessary to install an AC reactor on the power
input side to achieve the effect of proper current distribution.
⚫ Install each drive as close to each other as possible to reduce the wire length
and to reduce the DC side wire inductance as much as possible.
⚫ When installing with common DC bus, it is recommended to install a fuse on
the DC side.
NOTE:
⚫ Ensure that the two parallel-connected drives are the same series models with the same power.
⚫ The six-phase motor does not require the output reactors.
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