Application notes
56 IMGT30017EN
Requirements table
The following table shows how to select the motor insulation system and when optional du/dt filter, insulated N-end (non-driven
end) motor bearings and common mode filters are required.
The motor manufacturer should be consulted regarding the construction of the motor insulation. Failure of the motor to fulfil the
following requirements or improper installation may shorten motor life or damage the motor bearings.
Table 5A
Requirement for
du/dt filter, insulated N-end bearing
PN < 100 kW
and
frame size < IEC
315
100 kW < PN < 350 kW
or
frame size > IEC 315
PN > 350 kW
or
frame size > IEC 400
Motor type
Rated mains
voltage (AC line
voltage)
Motor insulation system
- 134 HP < PN < 469 HP
or frame size > NEMA
500
PN > 469 HP
UN < 420 V Standard: ÛLL =1300V + N + CMF + N + CMF
Standard: ÛLL =1300V + du/dt + du/dt + N + du/dt + N + CMF
or
420 V < UN < 500
V
Reinforced: ÛLL =1600V,
0.2µs rise time
- + N or CMF + N + CMF
Reinforced: ÛLL =1600 V + du/dt + du/dt + N + du/dt + N + CMF
or
500 V < UN < 600
V
Reinforced: ÛLL =1800 V + N or CMF + N + CMF
Random wound
and form-wound
600 V < UN < 690
V
Reinforced: ÛLL =1800 V + du/dt + du/dt + N + du/dt + N + CMF
Form wound
600 V < UN < 690
V
Reinforced: ÛLL =2000V,
0.3µs rise time
N.A. N + CMF N + CMF
Note 1: The abbreviations used in the table are defined below.
Abbreviation Definition
UN rated voltage of the supply network
ÛLL peak line-to-line voltage at motor terminals, which the motor insulation must withstand
PN motor rated power
du/dt du/dt filter at the output of the drive
CMF common mode filter
N N-end bearing: insulated motor non-driven end bearing
N.A. Motors of this power range are not available as standard units. Consult the motor manufacturer.
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 IP 23 motors, the
requirements of range “100 kW < PN < 350 kW” apply to motors with 40 kW < PN < 100 kW. The requirements of range “PN > 350
kW” apply to motors with PN within the range of “100 kW < PN < 350 kW”.
Note 4: 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.
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