Operation with medium-frequency motors
15
Application examples
15.3
L
15.3-1
EDS82EV903-1.0-11/2002
15.3 Operation with medium-frequency motors
Medium-frequency asynchronous motors are used for high and controllable
speeds. Possible applications are hobbing cutters for wood machining, fans,
vacuum pumps, concrete machinery, polishing drives.
l If the motor is to be braked quickly an external brake resistor is required to
brake high moments of inertia.
(¶ 13.4-1)
l
Set the speed setting range in a way that motors with self ventilation will
always be sufficiently cooled (setting range as load function).
Code Name Setting Comment
C0011 Max. output frequency Set to the value indicated on the motor nameplate, but not
higher than 400 Hz.
C0012 Acceleration time main
setpoint
Setting must ensure acceleration below t he current limit.
C0013 Deceleration time main
setpoint
Setting must ensure that braking is still possible with or without
an external brake resistor without getting the error message
“Overvoltage (OU)”.
C0014 Operating mode 2 Linear characteristic (best operating behaviour for
medium-frequency motors)
C0015 V/f rated frequency ^ 8.4-1
C0016 a
min
boost Setting depends on load at low frequencies.
Recommendation: 0 %
C0018 Chopper frequency 3 16 kHz (smooth running only at 16 kHz)
Observe power derating
C0021 Slip compensation 0% Usually not required.
C0022 I
max
limit (motor mode) Set to rated motor current.
150 % with short acceleration times and high moments of
inertia.
C0023 I
max
-limit in the
generator mode
150 % Lenze setting
C0106 Holding time for DCB 0s DC-injection brake must be off!
C0144 Chopper frequency
derating
0 No derating
Selection
Application-specific
configuration
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