NORDAC SK 750E Manual
108 Technical design subject to change BU 0750 GB
7.7 Additional parameters
Setting value / Description / Note
Before setting this parameter select the source of inverter control in P509. A mode 1 setting implies
that only the master frequency (setpoint 1 and control word) will be transmitted, whereas with mode
2 control will ensure transmission of the various actual values selected parameters P543, P544 and
P545.
Mode 3 provides for a 32-bit actual position to be put out along with a 16-bit setpoint speed (to be
ensured when ramping has been completed). Mode 3 is required for synchronization control when
the PosiCon option is used.
Mode 4 = Cam control. An additional detailed documentation is available on this subject which you
should use. The following are transmitted: 1
st
word: status word, 2
nd
word: current setpoint frequency
prior to the speed ramp, 3
rd
word: instantaneous torque current scaled to the torque limit, 4
th
word:
instantaneous actual frequency (corrected so as not to include the slip frequency)
0 = Off
1 = USS mode 1 (freq.)
2 = CAN mode 1 (freq.)
up to 250kBaud
3 = USS mode 2
(IW 1-3)
4 = CAN mode 2
(IW 1-3)
up to 250kBaud
5 = USS mode 3
(GL)
6 = CAN mode 3
(GL)
7 = USS mode 4
(KS)
8 = CAN mode 4
(KS)
This parameter is used to vary the internal pulse frequency which controls the power section. While
reducing the running noise of the motor, a high setting value will also cause an increase of radio in-
terference emission.
Note: The degree of radio interference suppression corresponding to limit curve A as stipulated
in the standard EN 55011 is ensured when setting a 6kHz value, provided that the wiring
instructions are properly followed.
I
2
t characteristic of the FI,
raising the pulse frequency
will result in a reduction of
the output current in relation
to time.
t sec( )
0.8 1 1.2 1.4 1.6 1.8 2 2.2
0
30
60
90
120
150
180
20 kHz 16 kHz 10 kHz <=6kHz
x Inenn
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