Operating Instructions

SINAMICS G120 CU230P-2 Control Units
List Manual, 04/2018, A5E33838102
237
2 Parameters
2.2 List of parameters
For bit 6 = 1:
The following applies for sensorless 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.
For bit 7 = 1:
The following applies for sensorless vector control of induction motors:
If the changeover limits are parameterized too low (p1755, p1756), then they are automatically increased to rugged
values by the absolute amount p1749 * p1755.
The effective time condition for changing over into open-controlled operation is obtained from the minimum value of
p1758 and 0.5 * r0384.
Is recommended that bit 7 is activated for applications that demand a high torque at low frequencies, and at the same
time require low speed gradients..
Adequate parameterization of the current setpoint must be ensured (p1610, p1611).
For bit 8 = 1: no influence on the functionality of bits 0, 1, 2
The following applies for sensorless vector control of induction motors:
Changeover into open-loop speed controlled operation is no longer dependent on the speed setpoint (except for
OFF3), but instead is essentially dependent on time condition p1758. As a consequence, a drive can be started or
reversed in closed-loop speed controlled operation with setpoints from an external control system, if these briefly lie
in the open-loop speed control range.
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.
p1750[0...n] Motor model configuration / MotMod config
PM240
PM250, PM260
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 0000 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 -