Siemens SINAMICS G120 Operating Instructions Manual page 290

Advanced commissioning
6.21 Cascade control
Switching off M1 ... M3 uncontrolled motors
Figure 6-37
Procedure for switching off an uncontrolled motor:
1. The speed-controlled motor turns with minimum speed p1080.
2. The control deviation of the technology controller is less than -p2373.
3. Time p2375 has expired.
The inverter accelerates the speed-controlled motor with ramp-up time p1120 to the
activation/deactivation speed p2378. Until the activation/deactivation speed p2378 is
attained, the inverter deactivates the technology controller temporarily.
4. After shutdown delay p2386, the inverter disconnects an uncontrolled motor.
Sequence for activating and deactivating the M1 ... M3 motors
Table 6-46 p2371 specifies the sequence for activating and deactivating the motors
p2371
Stage 1 Stage 2
1 M1
2 M1 M1+M2
3 M1 M2
4 M1 M1+M2 M1+M2+M3
5 M1 M3
6 M1 M2
7 M1 M1+M2
8 M1 M2
290
Conditions for switching off a motor
→ → → Sequence for activating motors → → →
→ → → Sequence for deactivating motors → → →
Stage 3 Stage 4
M1+M2
M1+M3 M1+M2+M3
M1+M2 M2+M3
M3 M1+M3
M3 M1+M3
Stage 5 Stage 6
M1+M2+M3
M1+M2+M3
M2+M3 M1+M2+M3
Converter with the CU230P-2 Control Units
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE
Power of the activated M1 ... M3
motors compared with the speed-
controlled DM motor
1 × DM 2 × DM
M1 ---
M1, M2 ---
M1 M2
M1, M2, M3 ---
M1, M2 M3
M1 M2, M3
M1, M2 ---
M1 M2
3 × DM
---
---
---
---
---
---
M3
M3