Parameter
Description
Data
Read/write
P340*
SamplingFreq
340
Function parameter for entering the sampling frequency.
(Prior to firmware MC V2.00 this parameter was for pulse
frequency). The smallest possible sampling time (time
slot) T0 is defined by the sampling frequency. The length
of time slot T0 is given by the reciprocal of the set
sampling frequency (T0=1/P340). In addition the set pulse
frequency is defined by the sampling frequency. The
pulse frequency indicates how often the valves in the
power section operate. A high sampling frequency
therefore signifies a short sampling time and thus a high
dynamic response but, at the same time, high utilization of
calculating time and greater heat losses in the converter
(switching losses). A low sampling frequency means a
lower dynamic response but more free calculating time
and smaller heat losses.
If an SLB SIMOLINK board or CBP2 Profibus board is
connected (only during clock-synchronized operation), the
sampling frequency is automatically set to low. In order to
ensure that synchronization to the SIMOLINK cycle-time
determined by the dispatcher or automation master can
take place, the sampling frequency must be set according
to the following rule: P340 = k x 4/cycle time where k = 1,
2, 3, ...
In some cases (Compact and chassis units), a sampling
frequency of 5kHz can lead to derating of the converter
rated current as compared with the value entered in P072.
The maximum sampling frequency that can be set for
standard applications is 7.5 kHz. The valid maximum
current with due account taken of the sampling frequency
can be read in r129.
See also parameter P357.
Init: 5,0
Min: 5,0
Max: 10,0
Unit: kHz
Indices: -
Type: O2
Menus:
- Parameter menu
+ Gating unit
- Drive setting
- Upread/free access
Changeable in:
- Drive setting
P341
f-Changeover
341
The deadtime compensation can also be automatically
activated or de-activated irrespective of the stator
frequency.
Index 1 determines the center frequency
Index 2 determines the hysterisis
Function is not implemented at present!
index1: 5,0
Min: 0,0
Max: 6553,5
Unit: Hz
Indices: 2
Type: O2
Menus:
- Parameter menu
+ Gating unit
- Upread/free access
Changeable in:
- Ready to switch on
P342
Max ModulatDepth
342
Function parameter for the maximum modulation depth of
the gating unit.
The parameter defines the level of the achievable output
voltage. At a maximum modulation depth of 86.6% the
amplitude of the output voltage corresponds to the DC link
voltage.
In the range from 86.6% to 100% the gating unit is
operated with overmodulated space vector modulation. In
this area inaccuracies in the torque output may occur,
especially in the case of induction motors. [FD 420]
Init: 100,0
Min: 20,0
Max: 100,0
Unit: %
Indices: -
Type: O2
Menus:
- Parameter menu
+ Control/gating unit
+ V/f open-loop control
+ Gating unit
- Upread/free access
Changeable in:
- Ready to switch on
- Operation enabled
r343
Modulation Depth
343
Visualization parameter for the current modulation depth
of the gating unit.
In function diagram:
VC: 390.8, 405.8
MC: 420.5
Dec.Plc.: 1
Unit: %
Indices: -
Type: I2
Menus:
- Parameter menu
+ Control/gating unit
+ Current control
+ V/f open-loop control
+ Gating unit
- Upread/free access
P346
Tdead Limitr Adj
346
Function parameter for parameterizing the gain factor of
deadtime compensation as a multiple of the gain of the
current controller. (Only effective with P296=3). With
P346=0 the value of the gain is infinte.
Init: 50
Min: 0
Max: 200
Unit: -
Indices: -
Type: O2
Menus:
- Parameter menu
+ Gating unit
- Upread/free access
Changeable in:
- Drive setting
- Ready to switch on
- Operation enabled
52
Siemens AG 6SE7087-6QX70 (Edition AL)
SIMOVERT MASTERDRIVES Compendium Motion Control