Hazardous Area Motors In Variable Speed Operation; Introduction; Main Requirements According To En And Iec Standards; Winding Insulation - ABB M2A Manual De Instalación E Usuario

5. Hazardous area motors in variable speed operation

5.1 Introduction

This part of the manual provides additional instructions for
motors used in hazardous areas in frequency converter
supply.
Additional information may be required by ABB to decide
on the suitability for some machine types used in special
applications or with special design modifications.
5.2 Main requirements according
to EN and IEC standards
Flameproof motors Ex d, Ex de
According to the standards, the motor must be dimen-
sioned so that the maximum outer surface temperature of
the motor is limited according to the temperature class
(T4, T5, etc.). In most cases this requires either type tests
or control of the outer surface temperature of the motor.
Most ABB flameproof motors for temperature class T4
have been type tested with ABB ACS800 converters
utilizing Direct Torque Control (DTC), and these combina-
tions can be selected using the dimensioning instructions
provided in Chapter 5.8.2.
In case of other voltage source converters (not DTC-con-
trolled as ACS800) with pulse width modulation type of
control (PWM), combined tests are usually needed to
confirm the correct thermal performance of the motor.
These tests can be avoided if flameproof motors are
equipped with thermal sensors intended for control of
surface temperatures. Such motors have the following
additional markings on the rating plate: - "PTC" with the
tripping temperature and "DIN 44081/82".
In the case of voltage source PWM converters with a
minimum switching frequency of 3 kHz or higher, instruc-
tions provided in Chapter 5.8.3 must be used for prelimi-
nary dimensioning.
For more information on T5 and T6 temperature class
flameproof motors used with variable speed drives, please
contact ABB.
Increased safety motors Ex e
ABB does not recommend the use of random wound low
voltage increased safety motors with variable speed
drives. This manual does not cover these motors in
variable speed drives.
Non-sparking motors Ex nA
According to the standards, the combination of motor and
converter must be tested as a unit or dimensioned by
calculation.
ABB non-sparking cast iron motors have been type tested
with ABB ACS800 converters utilizing DTC control, and
these combinations can be selected using the dimension-
ing instructions provided in Chapter 5.8.2.
12 – EN ABB Motors and Generators | Low voltage Ex motor manual 01-2007
In the case of voltage source PWM converters with a
minimum switching frequency of 3 kHz or higher, prelimi-
nary dimensioning instructions provided in Chapter 5.8.3
in this manual can be used. The final values must be
verified by combined tests.
Dust ignition proof motors DIP, Ex tD
According to the standards, the motor must be dimen-
sioned so that the maximum outer surface temperature of
the motor is limited according to the temperature class
(e.g. T125°C). For more information on a temperature
class lower than 125°C, please contact ABB.
ABB DIP/Ex tD motors (125°C) have been type tested with
ACS800 converters utilizing DTC control, and these
combinations can be selected using the dimensioning
instructions provided in Chapter 5.8.2.
In the case of any other voltage source converter with
pulse width modulation type of control (PWM), combined
tests are usually needed to confirm the correct thermal
performance of the motor. These tests can be avoided if
DIP-motors are equipped with thermal sensors intended
for control of the surface temperatures. Such motors have
the following additional markings on the rating plate: -
"PTC" with the tripping temperature and "DIN 44081/82".
In the case of voltage source PWM converters with a
minimum switching frequency of 3 kHz or higher, instruc-
tions provided in Chapter 5.8.3 can be used for preliminary
dimensioning.

5.3 Winding insulation

5.3.1 Phase to phase voltages

The maximum allowed phase to phase voltage peaks in
the motor terminal as a function of the rise time of the
pulse can be seen in Figure 4.
The highest curve "ABB Special Insulation" applies to
motors with a special winding insulation for frequency
converter supply, variant code 405.
The "ABB Standard Insulation" applies to all other motors
covered by this manual.

5.3.2 Phase to ground voltages

The allowed phase to ground voltage peaks at motor
terminals are:
Standard Insulation 1300 V peak
Special Insulation 1800 V peak
5.3.3 Selection of winding insulation
for ACS800-converters
In the case of ABB ACS800 single drives with a diode
supply unit, the selection of winding insulation and filters
can be made according to table below: