Planning the electrical installation
63
given below. For other motor types, see the Requirements table above. Apply the requirements of
range “100 kW < P
N
< 350 kW” to motors with P
N
< 100 kW. Apply the requirements of range P
N
>
350 kW to motors within the range “100 kW < P
N
< 350 kW”. In other cases, consult the motor
manufacturer.
Note 4: HXR and AMA motors
All AMA machines (manufactured in Helsinki) for drive systems have form-wound windings. All HXR
machines manufactured in Helsinki starting 1.1.1998 have form-wound windings.
Note 5: ABB motors of types other than M2_, M3_, HX_ and AM_
Use the selection criteria given for non-ABB motors.
Note 6: Resistor braking of the drive
When the drive is in braking mode for a large part of its operation time, the intermediate circuit DC
voltage of the drive increases, the effect being similar to increasing the supply voltage by up to 20
percent. The voltage increase should be taken into consideration when determining the motor insulation
requirement.
Example:
Motor insulation requirement for a 400 V application must be selected as if the drive were
supplied with 480 V.
Note 7: Drives with an IGBT supply unit
If voltage is raised by the drive (this is a parameter selectable function for special applications only),
select the motor insulation system according to the increased intermediate circuit DC voltage level,
especially in the 500 V supply voltage range.
Note 8: Calculating the rise time and the peak line-to-line voltage
The peak line-to-line voltage at the motor terminals generated by the drive as well as the voltage rise
time depend on the cable length. The requirements for the motor insulation system given in the table
are “worst case” requirements covering installations with 30-metre and longer cables. The rise time can
be calculated as follows: t = 0.8 · Û
LL
/(du/dt). Read Û
LL
and du/dt from the diagrams below. M
ultiply
the values of the graph by the supply voltage
(U
N
)
. In case of drives with an IGBT supply unit or resistor
braking, the Û
LL
and du/dt values are approximately 20% higher.
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
< 55 kW 55 kW < P
N
< 200 kW P
N
> 200 kW
P
N
< 74 HP 74 HP < P
N
< 268 HP P
N
> 268 HP
A
B
B
Random-
wound M3AA,
M3AP, M3BP
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
To Next Page
Loading...
