Siemens SINAMICS G120D List Manual page 224

Parameters
List of parameters
p1749[0...n] Motor model increase changeover speed encoderless operation / Incr n_chng no enc
Access level: 4
Can be changed: U, T
Units group: -
Min
0.0 [%]
Description: Minimum operating frequency for rugged operation.
If the minimum value is greater than the lower changeover limit parameterized with p1755 * (1 - 2 * p1756), then the
difference is displayed using p1749 * p1755. The parameter value cannot be changed.
Dependency: Refer to: p1752, p1755, p1756
p1750[0...n] Motor model configuration / MotMod config
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 7 = 1: Use rugged switchover limits to switchover the model (open-loop/closed-loop controlled) for regenerative
operation (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/open-loop controlled (PEM) for
blocked motor
07 Use rugged changeover limits
Dependency: Refer to: p0500
Caution: Do not use bit 6 = 1 if the motor can be slowly reversed by the load at the torque limit. Long delay times due to
blocking (p2177 > p1758) 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.
1-224
Calculated: p0340 = 1,3
Scaling: -
Unit selection: -
Max
99.0 [%]
Calculated: p0340 = 1,3,5
Scaling: -
Unit selection: -
Max
-
1 signal
Yes
Yes
Yes
Yes
Yes
Yes
© Siemens AG 2012 - 2013 All Rights Reserved
SINAMICS G120D List Manual (LH14), 01/2013
Data type: FloatingPoint32
Dyn. index: DDS, p0180
Func. diagram: -
Factory setting
50.0 [%]
Data type: Unsigned8
Dyn. index: DDS, p0180
Func. diagram: -
Factory setting
0000 0000 bin
0 signal
No
No
No
No
No
No
FP
-
-
-
-
-
-