ABB M2A series, Installation, Operation & Maintenance Instructions Manual

Page: 39 / 60

3GZF500730-70 rev. C RU-EN 01-2016 | ABB Motors and Generators EN – 39
6.7 Load and speed limitations
6.7.1 General
NOTE!
The maximum speed of the motor must not be
exceeded even if the loadability curves are given up
to 100 Hz.
6.7.2 Motor loadability with ACS800/880-
series of converters with DTC-control
The loadability curves (or load capacity curves) presented
in Figures 6 and 7 show the maximum allowed continuous
output torque of the motors as a function of supply
frequency. The output torque is given as a percentage of
the nominal torque of the motor.
6.7.3 Motor loadability with ACS500 –series
and other voltage source converters
The loadability curves (or load capacity curves) presented
in Figures 10 and 11 show the maximum allowed continu-
ous output torque of the motors as a function of supply
frequency. The output torque is given as a percentage of
the nominal torque of the motor.
NOTE!
The loadability curves in Figures 10 and 11 are
based on 3 kHz switching frequency.
For constant torque applications, the lowest allowed
continuous operating frequency is 15 Hz.
For quadratic torque applications, the lowest continuous
operating frequency is 5 Hz.
The combination of other voltage source converters than
the ACS 500 –series must either be tested or thermal
sensors to control the surface temperatures must be
connected.
6.7.4 Short time overloads
ABB flameproof motors usually provide a possibility for
short time overloading. For exact values, please see the
motor’s rating plate or contact ABB.
Overloadability is specified by three factors:
I
OL
Maximum short time current
T
OL
The length of allowed overload period
T
COOL
Cooling time required after each overload period.
During the cooling period motor current and
torque must stay below the limit of allowed
continuous loadability.
6.8 Rating plates
A VSD plate is mandatory for variable speed operation and
shall contain the necessary data to define the allowed duty
range in variable speed operation. At least the following
parameters must be shown on the rating plates of motors
for explosive atmospheres intended for variable speed
operation:
− Duty type
− Type of load (constant or quadratic)
− Type of converter and minimum switching frequency
− Power or torque limitation
− Speed or frequency limitation
6.8.1 Content of standard VSD plate
The standard VSD plate, Figure 14, contains following
information:
• Supply voltage or voltage range (VALID FOR) and
supply frequency (FWP) of the drive
• Motor type
• Minimum switching frequency for PWM converters
(MIN. SWITCHING FREQ. FOR PWM CONV.)
• Limits for short time overloads (I OL, T OL, T COOL ),
see chapter 6.7.4
• Allowed load torque for DTC controlled ACS800 con-
verters (DTC-CONTROL). The load torque is provided
as percent of the nominal torque of the motor.
• Allowed load torque for PWM controlled ACS550
converters (PWM-CONTROL). The load torque is
provided as percent of the nominal torque of the motor.
See also chapter 6.7.3.
The standard VSD plate requires calculation by the
customer to convert the generic data into motor specific
data. The hazardous motor catalogue will be required to
convert the frequency limits to speed limits, and the torque
limits into current limits. Customer specific plates can be
requested from ABB if preferred.
6.8.2 Content of customer specific
VSD plate
Customer specific VSD plates, Figures 15 and 16, contain
application and motor specific data for variable speed
application as follows:
• Motor type
• Motor serial number
• Frequency converter type (FC Type)
• Switching frequency (Switc. freq.)
• Field weakening or nominal point of the motor (F.W.P.)
• List of specific duty points
• Type of load (CONSTANT TORQUE, QUADRATIC
TORQUE, etc.)
• Speed range
• If the motor is equipped with thermal sensors suitable
for direct thermal control, a text “PTC xxx C DIN44081/-
82”, where “xxx” denotes the tripping temperature of
the sensors.