Siemens SINAMICS G120 Operating Instructions Manual page 279

Restrictions and general constraints for blocking protection depending on the motor type and
control mode
The following preconditions must be satisfied in order that the blockage monitoring is active
for pumps and fans:
● The following applies for application class "Standard Drive Control" (p0096 = 1) or
"Expert" (p0096 = 0) and U/f control (p1300 < 10):
Speed actual value > p2182 and > 10 % rated speed. A torque actual value r0080 is only
calculated in this range.
When the Imax control is active (when reaching the current limit) the blocking protection
intervenes according to the description in No-load monitoring, blocking protection, stall
protection (Page 274)
● For vector control (p1300 = 20) or application class "Dynamic Drive Control" (p0096 = 2),
the following always applies:
– Speed setpoint > p1755 switchover speed, motor model
– Speed actual value > p2182 speed threshold 1
In addition, the following applies:
– for induction motors (operated with the vector control)
– for synchronous and reluctance motors (operated with vector control)
Converter with CU230P-2 Control Units
Operating Instructions, 04/2015, FW V4.7 SP3, A5E34257946B AB
p1750.6 = 1 (when the motor is blocked, the closed-loop control does not change into
the open-loop controlled mode) or p2192 < 1 s
- p2182 > p1755 switchover speed, motor model
- With this method, a complete blockage is not detected
Advanced commissioning
6.7 Application-specific functions
279