Ground Connections; Unsymmetrically Grounded Networks - ABB ACS550-01 User Manual

ACS550 User's Manual
Based on:
• EN 60204-1 and IEC 60364-5-2/2001
• PVC insulation
• 30 °C (86 °F) ambient temperature
• 70 °C (158 °F) surface temperature
• Cables with concentric copper shield
• Not more than nine cables laid on cable ladder
side by side.
Max
Load
Current
(A)
249
284

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 that:
• ACS550-01 drives are shipped with the screw installed.
IEC
Max
Cu Cable Load
2
(mm ) Current
(A)
3x150 218
3x185 257
274
285
Based on:
• NEC Table 310-16 for copper wires
• 90 °C (194 °F) wire insulation
• 40 °C (104 °F) ambient temperature
• Not more than three current-carrying
conductors in raceway or cable, or earth
(directly buried).
• Copper cables with concentric copper shield
Max Load
Al Cable
Current
2
(mm )
(A)
3x185 237
3x240 264
3x (3x50) 291
2x (3x95) 319
NEC
Cu Wire Size
(AWG/kcmil)
4/0
250 MCM or 2 x 1
300 MCM or 2 x 1/0
350 MCM or 2 x 2/0
Technical Data
221