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1.6.5 Cabling, grounding and EMC
To provide proper grounding and to ensure compliance with any applicable EMC requirements, motors above 30 kW
shall be cabled by shielded symmetrical cables and EMC glands, i.e., cable glands providing 360° bonding.
Symmetrical and shielded cables are highly recommended also for smaller motors. Make the 360° grounding
arrangement at all the cable entries as described in the instructions for the glands. Twist the cable shields into
bundles and connect to the nearest ground terminal/bus bar inside the terminal box, converter cabinet, etc.
For motors with an output power of 100kW and above, additional potential equalization between the motor frame
and the driven equipment is required, unless both are mounted on a common steel base. In this case, the high
frequency conductivity of the connection provided by the steel base should be checked by, for example, measuring
the potential difference between the components.
More information about the grounding and cabling of variable speed drives can be found in the manual "Grounding
and cabling of the drive system" (Code: 3AFY 61201998).
NOTE:
1.6.6 Operating speed
For speeds higher than the nominal speed stated on the motor's rating plate or in the respective product catalogue,
ensure that either the highest permissible rotational speed of the motor or the critical speed of the whole application
is not exceeded.
1.6.7 Motor loadability
With ABB's frequency converters, the motors can be dimensioned by using ABB's DriveSize dimensioning program.
The tool is downloadable from the ABBwebsite (www.abb.com/motors&generators).
For applications supplied by other converters, the motors must be dimensioned manually. For more information,
please contact ABB.
The loadability curves (or load capacity curves) are based on a nominal supply voltage. Operation in under or over
voltage conditions may influence the performance of the application.
1.6.7.1 Motor loadability with AC_8_ _ – series of converters with DTC
control
The loadability curve presented in Chapter 1.11.1 Guideline loadability curves with converters with DTC control is valid
for ABB AC_8_ _– series converters with uncontrolled DC-voltage and DTC-control. The figure show the approximate
maximum continuous output torque of the motors as a function of the supply frequency. The output torque is given
as a percentage of the nominal torque of the motor. The values are indicative and exact values are available on
request.
NOTE:
1.6.7.2 Motor loadability with AC_5_ _ – series of converter
The loadability curve presented in Figure 10 Other voltage source PWM type converter, temperature rise F is valid for
AC_5_ _ – series converters. The figures show the approximate maximum continuous output torque of the motors as
a function of the supply frequency. The output torque is given as a percentage of the nominal torque of the motor.
The values are indicative and exact values are available on request.
NOTE:
Proper cable glands providing 360° bonding must be used at all termination points
such as motor, converter, possible safety switch, etc.
The maximum speed of the motor and application may not be exceeded!
The maximum speed of the motor and application may not be exceeded!
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