Siemens SINAMICS G120 Manual page 219

p1750[0...n] Motor model configuration / MotMod config
PM230 Access level: 3
Can be changed: U, T
Units group: -
Min
-
Description: Sets the configuration for the motor model.
Bit 0 = 1: Forces open-loop speed-controlled starting (ASM).
Bit 1 = 1: Forces the system to pass through frequency zero, open-loop-controlled (ASM).
Bit 2 = 1: Drive remains in full closed-loop control mode, even at zero frequency (ASM).
Bit 3 = 1: Motor model evaluates the saturation characteristic (ASM).
Bit 6 = 1: If the motor is blocked, sensorless vector control remains speed-controlled (ASM).
Bit field: Bit Signal name
00 Controlled start
01 Controlled through 0 Hz
02 Closed-loop ctrl oper. down to zero freq. for
passive loads
03 Motor model Lh_pre = f(PsiEst)
06 Closed-loop control when motor is blocked
Dependency: Refer to: p0500
Caution: Do not use bit 6 = 1 if the motor can be reversed by the load. Long delay times due to blocking (p2177) can cause
the motor to stall. In this case you should de-activate the function or use closed-loop control throughout the speed
range (note the information re bit 2 = 1).
Note: Bits 0 ... 2 only have an influence for encoderless vector control, bit 2 is pre-assigned depending on p0500.
Re bit 2 = 1:
The sensorless vector control is effective down to zero frequency. A change is not made into the open-loop speed
controlled mode.
This operating mode is possible for passive loads. These include applications where the load itself does not gener-
ate any active torque and therefore only acts reactively to the drive torque of the induction motor.
If bit 2 = 1, then bit 3 is automatically set to 1. Manual de-selection is possible and may be sensible if the saturation
characteristic (p1960) was not measured for third-party motors. Generally, for standard SIEMENS motors, the
already pre-assigned (default value) saturation characteristic is adequate.
When the bit is set, the selection of bits 0 and 1 is ignored.
Re bit 2 = 0:
Bit 3 is also automatically deactivated.
Re bit 6 = 1:
The following applies for encoderless vector control of induction motors:
For a blocked motor (see p2175, p2177) the time condition in p1758 is bypassed and a change is not made into
open-loop controlled operation.
© Siemens AG 2011 All Rights Reserved
SINAMICS G120 Control Units CU230P-2 Parameter Manual (LH9), 01/2011
Calculated: p0340 = 1,3,5
Scaling: -
Unit selection: -
Max
-
1 signal
Yes
Yes
Yes
Yes
Yes
Parameters
List of Parameters
Data type: Unsigned8
Data set: DDS, p0180
Factory setting
0000 1100 bin
0 signal
No
No
No
No
No
FP
-
-
-
-
-
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