ACS510 User’s Manual
217
Technical Data
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
systems, disconnect the internal ground connection by removing the screws (do this
also if the grounding configuration of the system is unknown):
• ACS510-01, frame sizes R1…R4: Remove both the EM1 and EM3 screws.
• Frame sizes R5…R6: Remove both the F1 and F2 screws.
The screws (M4x16) 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 screws may be installed. For
reference, the diagram on the right illustrates a symmetrically
grounded TN system.
Floating Networks
Warning!
Do not attempt to install or remove EM1, EM3, F1 or F2 screws while
power is applied to the drive’s input terminals.
For floating networks (also known as IT, ungrounded, or impedance/resistance
grounded networks):
• Disconnect the ground connection to the internal RFI filters:
– ACS510-01, frame sizes R1…R4: Remove both the EM1 and EM3 screws
(see "Power Connection Diagrams" on page 15).
– Frame sizes R5…R6: Remove both the F1 and F2 screws (see page 16).
• Where EMC requirements exist, check for excessive emission propagated to
neighboring low voltage networks. In some cases, the natural suppression in
Unsymmetrically Grounded systems – EM1, EM3, F1 and F2 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
L1
L2
L3
L1
L2
L3
L1
N
L1
L1
L2
L2
L3
L3
L1
L2
L3
Supplied from China by: Guangzhou Tofee Electro Mechanical Equipment Co., Ltd
Email: [email protected]
