Drive’s Power Connection Terminals - ABB ACS550 User Manual

268
IT systems
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 IT systems [an ungrounded power system or a high resistance-grounded (over
30 ohm) power system]:
• Disconnect the ground connection to the internal EMC filters:
– ACS550-01, frame sizes R1...R4: Remove both the EM1 and EM3 screws
– ACS550-U1, frame sizes R1...R4: Remove the EM1 screw – drive is shipped
– Frame sizes R5...R6: Remove both the F1 and F2 screws (see section
• Where EMC requirements exist, check for excessive emission propagated to
neighboring low voltage networks. In some cases, the natural suppression in
transformers and cables is sufficient. If in doubt, use a supply transformer with
static screening between the primary and secondary windings.
• Do NOT install an external RFI/EMC filter. Using an EMC filter grounds the input
power through the filter capacitors, which could be dangerous and could damage
the drive.
Drive's power connection terminals
The following table provides specifications for the drive's power connection
terminals.
Frame
size
1
R1
1
R2
1
R3
1
R4
1
R5
R6
1
Aluminium cable cannot be used with frame sizes R1...R5 because of its lower capacity.
Technical data
(see section Power connection diagrams
with EM3 removed (see section
connection diagrams, page 21).
U1, V1, W1
U2, V2, W2
BRK+, UDC+ terminals
Max. terminal size
2
mm AWG
6 8
10 6
25 3
50 1/0
70 2/0
185 350 MCM 40
on page 20).
Power connection diagrams
Torque Max. terminal size
N·m lb-ft mm
1.4 1 4
1.4 1 10
1.8 1.3 16
2 1.5 35
15 11 70
30 95
ACS550 User's Manual
on page 20).
Earthing PE terminal
2
AWG N·m
10 1.4
8 1.4
6 1.8
2 2
2/0 15
4/0 8
Power
Torque
lb-ft
1
1
1.3
2
11
6
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