This table shows the requirements for protecting the motor insulation and bearings
in drive systems for ABB random-wound motor series (for example, M3AA, M3AP
and M3BP).
Requirement forNominal AC sup-
ply voltage
ABB d
u
/d
t
and common mode filters, insulated N-end
motor bearings
Motor insulation
system
P
n
≥ 200 kW100 kW ≤
P
n
<
200 kW
P
n
< 100 kW
P
n
≥ 268 hp140 hp ≤
P
n
<
268 hp
P
n
< 140 hp
+ N + CMF+ N-Standard
U
n
≤ 500 V
+ d
u
/d
t
+ N +
CMF
+ d
u
/d
t
+ N+ d
u
/d
t
Standard500 V <
U
n
≤
600 V
or
+ N + CMF+ N-Reinforced
+ d
u
/d
t
+ N +
CMF
+ d
u
/d
t
+ N+ d
u
/d
t
Reinforced600 V <
U
n
≤
690 V
Additional requirements for non-ABB high-output and IP23 motors
The rated output power of high-output motors is higher than what is stated for
the particular frame size in EN 50347 (2001).
If you plan to use a non-ABB high-output motor or an IP23 motor, consider these
additional requirements for protecting the motor insulation and bearings in drive
systems:
• If motor power is below 350 kW: Equip the drive and/or motor with the filters
and/or bearings according to the table below.
• If motor power is above 350 kW: Consult the motor manufacturer.
Guidelines for planning the electrical installation 65