ABB ACQ550-x1-06A6-2 User Manual page 275

ACQ550-U1 User's Manual
Ground connections
For personnel safety, proper operation and reduction of 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.
Corner grounded TN systems
WARNING! Do not attempt to install or remove the EMC filter screws EM1, EM3, F1
or F2 while power is applied to the drive's input terminals.
Corner grounded TN systems are defined in the following table. In such systems,
disconnect the internal ground connection through the EMC filter capacitors (do this
also if the grounding configuration of the system is unknown), see section
Disconnecting the internal EMC filter
Grounded at the
corner of the
delta
Single phase,
grounded at an
end point
The EMC filter capacitors make an internal ground connection
that reduces electro-magnetic emission. Where EMC (electro-
magnetic compatibility) is a concern, and the system is
symmetrically grounded, the EMC filter may be connected.
For reference, the diagram on the right illustrates a
symmetrically grounded TN system (TN-S system).
Corner grounded TN systems – EMC filter must be disconnected
L1
N
on page 23.
Grounded at the
L1
mid point of a
delta leg
L2
L3
Three phase
"Variac" without
solidly grounded
neutral
275
L1
L2
L3
L1
L1
L2
L2
L3
L3
L1
L2
L3
Technical data