ACH550 Installation, Operation and Maintenance Manual 11
ACH550-UH
Ground connections
For personnel safety, proper operation and to reduce electromagnetic emission/pick-
up, the drive and the motor must be grounded at the installation site.
• Conductors must be adequately sized as required by safety regulations.
• Power cable shields must be connected to the drive PE terminal in order to meet
safety regulations.
• Power cable shields are suitable for use as equipment grounding conductors only
when the shield conductors are adequately sized as required by safety
regulations.
• In multiple drive installations, do not connect drive terminals in series.
Unsymmetrically grounded networks
WARNING! Do not attempt to install or remove EM1 or EM3 screws while power is
applied to the drive’s input terminals.
Unsymmetrically grounded networks are defined in the following table. In such
networks, the internal connection provided by the EM3 screw (on frame sizes
R1…R4 only) must be disconnected by removing EM3. If the grounding
configuration of the network is unknown, remove EM3.
Note: ACH550-UH drives are shipped with the screw removed (but included in the
conduit box).
Unsymmetrically Grounded Networks – EM3 Must Be Out
Grounded at the
corner of the
delta
Grounded at the
mid point of a
delta leg
Single phase,
grounded at an
end point
Three phase
“Variac” without
solidly grounded
neutral
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