Frequency And Speed Limitations - Lenze i950 Commissioning Manual

Configuring the motor control

Frequency and speed limitations

13.10 Frequency and speed limitations
By limiting the maximum output frequency to ± 599 Hz, the devices are not sub-
ject to the export restrictions of the "EC-Dual-Use Regulation" (EC 428/2009).
This applies to devices supplied from the middle of the year 2015. For certain
applications, the supply of devices with the current maximum output frequency
of ± 1999 Hz. If required, get in touch with your Lenze contact person.
Output frequency
The output frequency of the i700 servo inverter is limited to a maximum value, the amount of
which corresponds to the lower of the two following values:
f Maximum output frequency
lim
f Switching frequency
chop
f Maximum device output frequency 0x2835:001, depending on the device type ± 599
max_device
Hz or ± 1999 Hz
Due to the restrictions by the "dual use regulation" (EC 428/2009), values higher than + 599
Hz to + 1000 Hz or - 599 Hz to - 1000 Hz do not increase the output frequency. Please observe
the deadband occurring in this case.
Speed setpoint
If servo control is used, the speed setpoint is limited depending on the number of motor pole
pairs:
n Speed limit value
lim
f Maximum output
lim
zp Number of motor pole pairs
If the speed setpoint is limited, bit 1 ("Speed: Setpoint 1 limited") or bit 5 ("Speed: Set-
•
point 2 limited") is set in the Lenze status word 0x2831.
The behaviour corresponds to the behaviour which is shown when the set maximum
•
speed 0x6080 is reached.
The sequence is: limit the speed to
•
Frequency setpoint
If V/f characteristic control is used, the frequency setpoint is limited in addition to the speed
setpoint.
If the frequency setpoint is limited, bit 10 ("Output frequency limited") is set in the Lenze
•
status word 0x2831.
276
f
chop
=
f oder
lim
8
0x2939
f
= lim
n
lim
zp
frequency0x2939
0x6080 first, then limit it to the speed limit value n
=
f f
lim max_ Geräte
.
lim