Eaton M-Max series - Selection Criteria

M-Max Series Overview
M-Max Series Adjustable Frequency Drive MN04020003E—October 2013 www.eaton.com 15
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.
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~400V)
●
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.
The speed control with slip compensation (P11.8) increases
the drive dynamics and optimizes the output. For this the
frequency inverter processes all motor data in an electrical
image.
The speed control operating mode (P11.8) must only be used
with single drives (one motor at the output of the frequency
inverter). The rated current of the motor must be assigned to
the rated operational current of the frequency inverter (same
rating).
230/400V /
4.0/2.3A
0.75
0.67
cos
kW
min
–1
1410 50 Hz
U, I, f
I
OK
BAC
K
RES
ET
LOC
RE
M
1
2
3