ABB ACS800-02 - Motor Insulation and Filter Requirements

Planning the electrical installation
28
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.
Manufacturer
Motor type Nominal mains
voltage (AC line
voltage)
Requirement for
Motor insulation
system
ABB du/dt filter, insulated N-end bearing and ABB common mode
filter
P
N
< 100 kW
and
frame size < IEC 315
100 kW <
P
N
< 350 kW
or
frame size >
IEC 315
P
N
> 350 kW
or
frame size >
IEC 400
P
N
< 134 HP
and frame size <
NEMA 500
134 HP <
P
N
< 469 HP
or frame size >
NEMA 500
P
N
> 469 HP
A
B
B
Random-
wound M2_
and M3_
U
N
< 500 V Standard - + N + N + CMF
500 V < U
N
< 600 V Standard + du/dt + du/dt + N + du/dt + N + LCMF
or
Reinforced - + N + N + CMF
600 V < U
N
< 690 V Reinforced + du/dt + du/dt + N + du/dt + N + LCMF
Form-wound
HXR and AM_
380 V < U
N
< 690 V Standard n.a. + N + CMF + N + CMF
Old* form-
wound HX_
and modular
380 V < U
N
< 690 V Check with the
motor
manufacturer.
+ du/dt with voltages over 500 V + N + CMF
Random-
wound HXR
and AM_
380 V < U
N
< 690 V Check with the
motor
manufacturer.
+ du/dt with voltages over 500 V + N + CMF