Rockwell Automation Publication 2198-RM005A-EN-P - October 2020
39
Dimensions, Cables, and Wiring Chapter 3
Three-phase Power Wired to Single-phase Drives
This example illustrates grounded three-phase power that is wired to single-
phase Kinetix 350 drives when phase-to-phase voltage is within drive
specifications.
Figure 17 - Single-phase Amplifiers on Three-phase Power (WYE)
(1)
Contactors (MI, M2, and M3) can be optional. Implementation of control circuits and risk assessment is the responsibility of
the machine builder. Reference international standards IEC 62061 and ISO 13849-1 estimation and safety performance
categories. AC line filter is optional, but is required for CE compliance.
Feeder short circuit protection is not illustrated.
This example illustrates grounded three-phase power that is wired to single-
phase Kinetix 350 drives when phase-to-phase voltage exceeds drive
specifications.
A neutral must be connected when single-phase drives are attached to a three-
phase isolating transformer secondary. It is not necessary that all three-phases
be loaded with drives, but each drive must have its power return via the neutral
connection.
.
ATTENTION:
Failure to connect the neutral can result in supply voltage swings at
the individual drives. This condition occurs when the neutral point moves vectorially
as a result of load variations that individual drives experience. The supply voltage
swing can cause undervoltage and overvoltage trips on the drives, and the drive can
be damaged if the overvoltage limit is exceeded.
L1
L2
L3
IPD
L1
L2
IPD
L1
L2
IPD
L1
L2
L1
L2
L3
L2
L3
L1
Transformer
(WYE) Secondary
Grounded Neutral
Kinetix 350 Drives
(System A)
Single-phase AC Input
Input Fusing
M1
(1)
M2
(1)
M3
(1)
Ground Grid or
Power Distribution Ground
Bonded Cabinet
Ground Bus
Kinetix 350 Drives
(System B)
Single-phase AC Input
Kinetix 350 Drives
(System C)
Single-phase AC Input
Input Fusing
Input Fusing
2097-V32PR
x
-LM
