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 -
Dependency: See also: 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.
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.
r1751 Motor model status / MotMod status
Access level: 4 Calculated: - Data type: Unsigned32
Can be changed: - Scaling: - Dynamic index: -
Unit group: - Unit selection: - Function diagram: -
Min:
-
Max:
-
Factory setting:
-
Description: Displays the status of the motor model.
Bit field: Bit Signal name 1 signal 0 signal FP
00 Controlled operation Active Inactive 6721
01 Set ramp-function generator Active Inactive -
02 Stop RsLh adaptation Yes No -
03 Feedback Active Inactive -
Parameters
7.2 Parameter list
SINAMICS G120X converter
704 Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC
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