Operating Instructions
2 Parameters
2.2 List of parameters
SINAMICS G120 CU230P-2 Control Units
236 List Manual, 04/2018, A5E33838102
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: Not visible with application class: "Standard Drive Control" (SDC, p0096 = 1)
Refer to: p1755, p1756
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 8 = 1: Open-loop speed controlled operation independent of the speed setpoint (except for OFF3) (ASM).
Dependency: Not visible with application class: "Standard Drive Control" (SDC, p0096 = 1)
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 deactivate 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 sensorless vector control, bit 2 is pre-assigned depending on p0500.
For 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 generate
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.
For bit 2 = 0:
Bit 3 is also automatically deactivated.
p1749[0...n] Motor model increase changeover speed encoderless operation / Incr n_chng no enc
Access level: 4 Calculated: p0340 = 1,3 Data type: FloatingPoint32
Can be changed: U, T Scaling: - Dyn. index: DDS, p0180
Unit group: - Unit selection: - Func. diagram: -
Min Max Factory setting
0.0 [%] 99.0 [%] 50.0 [%]
p1750[0...n] Motor model configuration / MotMod config
PM230 Access level: 3 Calculated: p0340 = 1,3,5 Data type: Unsigned16
Can be changed: U, T Scaling: - Dyn. index: DDS, p0180
Unit group: - Unit selection: - Func. diagram: -
Min Max Factory setting
- - 0000 0000 0000 1100 bin
Bit field: Bit Signal name 1 signal 0 signal FP
00 Controlled start Yes No -
01 Controlled through 0 Hz Yes No -
02 Closed-loop ctrl oper. down to zero freq. for
passive loads
Yes No -
03 Motor model Lh_pre = f(PsiEst) Yes No -
06 Closed-loop/open-loop controlled (PMSM)
for a blocked motor
Yes No -
07 Use rugged changeover limits Yes No -
08 Closed-loop controlled until wait time p1758
has expired
Yes No -