Lenze i700 - Manual (Page 156)

5 Motor control & motor settings
5.18 Frequency and speed limitations
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Lenze · i700 servo inverter · Reference manual · DMS 1.5 EN · 03/2014 · TD05
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5.18 Frequency and speed limitations
Output frequency
The output frequency of the i700 servo inverter is limited to a maximum value whose amount
corresponds to the lower of the two following values:
Speed setpoint
If servo control is used, the speed setpoint is limited depending on the number of motor pole pairs:
• If the speed setpoint is limited, bit 1 ("Speed: Setpoint 1 limited") or bit 5 ("Speed: Setpoint 2
limited") is set in the Lenze status word ( 0x2831 or 0x3031 for axis B).
• The behaviour corresponds to the behaviour which is shown when the set maximum speed
( 0x6080 or 0x6880 for axis B) is reached.
• The sequence is: Limit the speed to 0x6080 (or 0x6880 for axis B) first, then limit it to the speed
limit value n
lim
.
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 or 0x3031 for axis B).
f
lim
Maximum output frequency
f
chop
Switching frequency ( 0x2939 or 0x3139 for axis B)
f
max_device
Maximum device output frequency (currently 1999 Hz; dependent on the device version)
n
lim
Speed limit value
f
lim
Maximum output frequency
zp Number of motor pole pairs
f
lim
f
chop
8
------------ =
or f
lim
f
max_device =
n
lim
f
lim
zp
--------- =