ABB ACS550-02 User Manual page 9

Requirements Table
The following table shows how to select the motor insulation system and when external du/dt limitation
and insulated N-end (non-driven end) motor bearings are required. The motor manufacturer should be
consulted regarding the construction of the motor insulation and additional requirements for explosion-
safe (EX) motors. Failure of the motor to fulfil the following requirements or improper installation may
shorten motor life or damage the motor bearings. ACS550-02/U2 devices have common mode filters
(CMF) as standard accessories.
Motor type Nominal mains
voltage (AC line
voltage)
A Random- U < 500 V
N
wound M2_
B
and M3_
B
Form-wound 380 V < U
HXR and AM_
Old* form- 380 V < U
wound HX_
and modular
Random- 380 V < U
wound HXR
and AM_
N Random- U < 420 V
N
wound and
O
form-wound
N 420 V < U
-
A
B
B
* manufactured before 1992
Motor insulation
system
Standard
< 480 V Standard
N
< 480 V Check with the
N
motor
manufacturer.
< 480 V Check with the
N
motor
manufacturer.
Standard: Û =
LL
1300 V
< 500 V Standard: Û =
N LL
1300 V
or
Reinforced: Û =
LL
1600 V, 0.2
microsecond rise
time
Requirement for
ABB du/dt limitation and insulated N-end bearing
P 100 kW < P
< 100 kW
N
and
frame size > IEC 315
frame size < IEC 315
P < 134 HP 134 HP < P
N
and frame size < or frame size >
NEMA 500
- + N
n.a. + N
- + N
+ du/dt + du/dt + N
or
+ du/dt
- + N
P
< 350 kW > 350 kW
N N
or
or
frame size > IEC 400
< 469 HP P > 469 HP
N N
NEMA 500
+ N
+ N
+ N
+ du/dt + N
+ N
Installation
7