Planning the electrical installation
59
To avoid damage to motor bearings:
• select and install the cables according to the instructions given in the hardware
manual
• use insulated N-end (non-drive end) bearings and output filters from ABB
according to the Requirements table below.
Requirements table
The following table shows how to select the motor insulation system and when an
optional ABB du/dt filter, insulated N-end (non-drive 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 and
voids the warranty.
Manufacturer
Motor type Nominal 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
or frame size >
NEMA 580
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 + CMF
or
Reinforced - + N + N + CMF
600 V < U
N
< 690 V Reinforced + du/dt + du/dt + N + du/dt + N + CMF
Form-wound
HX_ and AM_
380 V < U
N
< 690 V Standard n.a. + N + CMF P
N
< 500 kW: + N +
CMF
P
N
> 500 kW: + N +
CMF + du/dt
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 HX_
and AM_ **
0 V < U
N
< 500 V Enamelled wire
with fiber glass
taping
+ N + CMF
500 V < U
N
< 690 V + du/dt + N + CMF
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