ABB ACS850 Hardware Manual page 61

Note 2: Explosion-safe (EX) motors
The motor manufacturer should be consulted regarding the construction of the motor insulation and
additional requirements for explosion-safe (EX) motors.
Note 3: High-output motors and IP 23 motors
For motors with higher rated output than what is stated for the particular frame size in EN 50347 (2001)
and for IP23 motors, the requirements of ABB random-wound motor series (for example M3AA, M3AP,
M3BP) are given below. For non-ABB motor types, see the
requirements of range 100 kW < P
range P
motor manufacturer.
Motor type Nominal mains
voltage (AC line
voltage)
A Random- U < 500 V
N
wound
B
500 V < U
B
600 V < U
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 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:
the values of the graph by the supply voltage (U
du/dt values are approximately 20% higher.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
> 350 kW to motors within the range 100 kW < P
N
Motor insulation
system
Standard
< 600 V Standard
N
or
Reinforced
< 690 V Reinforced
N
t = 0.8 · Û
Requirements table
< 350 kW to motors with P
N
N
Requirement for
ABB du/dt filter, insulated N-end bearing and ABB common mode
P < 100 kW 100 kW < P
N
P < 140 hp 140 hp < P
N
- + N
+ du/dt + du/dt + N
- + N
+ du/dt + du/dt + N
/(du/dt). Read Û and du/dt from the diagrams below. Multiply
LL LL
). In case of drives with resistor braking, the Û
N
above. Apply the
< 100 kW. Apply the requirements of
N
< 350 kW. In other cases, consult the
filter
< 200 kW P
N
< 268 hp P
N
+ N + CMF
+ du/dt + N + CMF
+ N + CMF
+ du/dt + N + CMF
Planning the electrical installation
61
> 200 kW
N
> 268 hp
N
and
LL