Siemens CU240B-2 Parameter Manual page 239

p1832 Dead time compensation current level / t_dead_comp I_lev
Access level: 4
Can be changed: U, T
Units group: -
Min
0.0 [Arms]
Description: Sets the current level for the dead time compensation.
Above the current level, the dead time - resulting from the converter switching delays - is compensated by a previ-
ously calculated constant value. If the relevant phase current setpoint falls below the absolute value defined by
p1832, the corrective value for this phase is continuously reduced.
Dependency: The factor setting of p1832 is automatically set to 0.02 * rated drive converter current (r0207).
p1900 Motor data identification and rotating measurement / MotID and rot meas
Access level: 2
Can be changed: C(1), T
Units group: -
Min
0
Description: Sets the motor data identification and speed controller optimization.
p1900 = 0:
Function inhibited.
p1900 = 1:
Sets p1910 = 1 and p1960 = 0, 1 depending on p1300
When the drive enable signals are present, a motor data identification routine is carried out at standstill with the
next power-on command. Current flows through the motor which means that it can align itself by up to a quarter of
a revolution.
With the following power-on command, a rotating motor data identification routine is carried out - and in addition, a
speed controller optimization by making measurements at different motor speeds.
p1900 = 2:
Sets p1910 = 1 and p1960 = 0
When the drive enable signals are present, a motor data identification routine is carried out at standstill with the
next power-on command. Current flows through the motor which means that it can align itself by up to a quarter of
a revolution.
p1900 = 3:
Sets p1960 = 0, 1 depending on p1300
This setting should only be selected if the motor data identification was already carried out at standstill.
When the drive enable signals are present, with the next power-on command, a rotating motor data identification
routine is carried out - and in addition, speed controller optimization by taking measurements at different motor
speeds.
Value: 0:
1:
2:
3:
Dependency: Refer to: p1300, p1910, p1960
Refer to: A07980, A07981, F07983, F07984, F07985, F07986, F07988, F07990, A07991
Notice: If there is a motor holding brake, it must be open (p1215 = 2).
To permanently accept the determined settings they must be saved in a non-volatile fashion (p0971).
For p0014 = 1, the following applies:
After the value has been modified, no further parameter modifications can be made and the status is shown in
r3996. Modifications can be made again when r3996 = 0.
Note: The motor and control parameters are only optimally set when both measurements are carried out (initially at stand-
still, and then with the motor rotating).
An appropriate alarm is output when the parameter is set.
The power-on command must remain set during a measurement and after the measurement has been completed,
the drive automatically resets it.
The duration of the measurements can lie between 0.3 s and several minutes. This time is, for example, influenced
by the motor size and the mechanical conditions.
p1900 is automatically set to 0 after the motor data identification routine has been completed.
© Siemens AG 2011 All Rights Reserved
SINAMICS G120 Control Units CU240B/E-2 Parameter Manual (LH11), 01/2011
Inhibited
Identify motor data at standstill and with motor rotating
Identify motor data at standstill
Identify motor data with motor rotating
Calculated: p0340 = 1
Scaling: -
Unit selection: -
Max
10000.0 [Arms]
Calculated: -
Scaling: -
Unit selection: -
Max
3
Parameters
List of Parameters
Data type: FloatingPoint32
Data set: -
Factory setting
0.0 [Arms]
Data type: Integer16
Data set: -
Factory setting
0
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