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To avoid damage to motor bearings, insulated N-end (non-driven end) bearings and
output filters from ABB must be used according to the following table. In addition, the
cables must be selected and installed according to the instructions given in this
manual. Three types of filters are used individually or in combinations:
• optional du/dt filter (protects motor insulation system and reduces bearing
currents).
• common mode filter (mainly reduces bearing currents)
• light common mode filter (mainly reduces bearing currents).
The common mode filter is composed of toroidal cores installed inside the drive at
the factory.
Requirements table
The following table shows how to select the motor insulation system and when optional ABB du/dt filter,
insulated N-end (non-driven end) motor bearings and ABB common mode filters 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.
Motor type
Nominal mains
voltage (AC line
voltage)
A
Random-
U
< 500 V
N
wound M2_
B
500 V < U
and M3_
B
600 V < U
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_
Planning the electrical installation
Motor insulation
system
Standard
< 600 V Standard
N
or
Reinforced
< 690 V Reinforced
N
< 690 V Standard
N
< 690 V Check with the
N
motor
manufacturer.
< 690 V Check with the
N
motor
manufacturer.
Requirement for
ABB du/dt filter, insulated N-end bearing and ABB common mode
P
< 100 kW
100 kW < P
N
and
frame size > IEC 315
frame size < IEC 315
P
< 134 HP
134 HP < P
N
and frame size <
NEMA 500
-
+ N
+ du/dt
+ du/dt + N
-
+ N
+ du/dt
+ du/dt + N
n.a.
+ N + CMF
+ du/dt with voltages over 500 V + N + CMF
+ du/dt with voltages over 500 V + N + CMF
filter
< 350 kW
P
N
N
or
frame size > IEC 400
< 469 HP
P
N
N
or frame size >
NEMA 500
+ N + CMF
+ du/dt + N + LCMF
+ N + CMF
+ du/dt + N + LCMF
+ N + CMF
> 350 kW
or
> 469 HP
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