276 ACQ550-U1 User’s Manual
Technical data
IT 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.
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 filter, see section
Disconnecting the internal EMC filter on page 23.
• 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
U1, V1, W1
U2, V2, W2
BRK+, UDC+ terminals
Earthing PE terminal
Minimum
wire size
Maximum
wire size
Tightening
torque
Maximum
wire size
Tightening
torque
mm
2
AWG mm
2
AWG N·m lb·ft mm
2
AWG N·m lb·ft
R1
1
0.75 18 16 61.311661.31
R2
1
0.75 18 16 61.311661.31
R3
1
2.5 14 25 32.722532.72
R4
1
10 8501/0 5.6 450110 5.6 4
R5
1
16 6702/0 15 11 70 2/0 15 11
R6
2
95
3
3/0
3
105 350 MCM 40 30 105 350 MCM 40 30
00467918.xls C
1
Aluminium cable cannot be used with frame sizes R1…R5 because of its lower capacity.
2
Aluminium cable cannot be used with type ACQ550-01-290A-4 because of the terminal size.
3
See section Power terminal considerations – R6 frame size on page 277.
Note: See the recommended cable sizes for different load currents in section Input power cables/
wiring on page 274.
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