Eaton PowerXL DG1 - Selection Criteria; Proper Use; Figure 11. Selection Criteria

20
Chapter 3—Product overview
POWERXL SERIES VFD MN040002EN—February 2018 www.eaton.com
Selection criteria
The frequency inverter [3] is selected according to
the supply voltage U
LN of the input supply [1] and the
rated current of the assigned motor [2]. The circuit type
(/[) of the motor must be selected according to the
supply voltage[1]. The rated output current I
e
of the
frequency inverter must be greater than/equal to the rated
motorcurrent.
Figure 11. Selection criteria
When selecting the drive, the following criteria must
beknown:
•
Type of motor (three-phase asynchronous motor)
•
Input voltage = rated operating voltage of the motor (for
example, 3 AC ~400 V)
•
Rated motor current (guide value, dependent on the
circuit type and the supply voltage)
•
Load torque (quadratic, constant)
•
Starting torque
•
Ambient temperature (rated value 122°F [50 °C])
When connecting multiple motors in parallel to the output
of a frequency inverter, the motor currents are added
geometrically—separated by effective and idle current
components. When you select a frequency inverter,
make sure that it can supply the total resulting current.
Ifnecessary, for dampening and compensating the deviating
current values, motor reactors or sinusoidal filters must be
connected between the frequency inverter and the motor.
The parallel connection of multiple motors in the output
of the frequency inverter is only permitted with V/Hz
characteristic curve control.
If you connect a motor to an operational frequency inverter,
the motor draws a multiple of its rated operational current.
When you select a frequency inverter, make sure that the
starting current plus the sum of the currents of the running
motors will not exceed the rated output current of the
frequency inverter.
Switching in the output of the frequency inverter is only
permitted with V/Hz characteristic curve control.
Proper use
The PowerXL frequency inverters are electrical apparatus for
controlling variable speed drives with three-phase motors.
They are designed for installation in machines or for use
in combination with other components within a machine
orsystem.
After installation in a machine, the frequency inverters must
not be taken into operation until the associated machine
has been confirmed to comply with the safety requirements
of Machinery Safety Directive (MSD) 2006/42 EC (meets
the requirements of EN 60204). The user of the equipment
is responsible for ensuring that the machine use complies
with the relevant EU Directives.
The CE markings on the PowerXL frequency inverter
confirm that, when used in a typical drive configuration,
the apparatus complies with the European Low
Voltage Directive (LVD) andthe EMC Directives
(Directive2014/35/EU and Directive2014/30/EU.
In the described system configurations, PowerXL frequency
inverters are suitable for use in public and non-public
networks.
A connection to IT networks(networks without reference
to earth potential) is permissible only to a limited extent,
because the device’s built-in filter capacitors connect the
network with the earth potential (enclosure). On earth free
networks, this can lead to dangerous situations or damage
to the device (isolation monitoring required).
To the output of the frequency inverter (terminals U, V, W)
you must not:
•
connect a voltage or capacitive loads (for example, phase
compensation capacitors)
•
connect multiple frequency inverters in parallel
•
make a direct connection to the input (bypass)
Observe the technical data and connection requirements.
For additional information, refer to the equipment nameplate
or label at the frequency inverter, and the documentation.
Any other usage constitutes improper use.