Siemens CU240B-2 - Page 324

Advanced commissioning
6.7 Application-specific functions
Converter with the CU240B-2 and CU240E-2 Control Units
324 Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
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 V/f control (p1300 < 10):
Speed actual value > p2182 and > 10% rated speed. A torque actual value r0080 is only
calculated in this range.
For active Imax controller (when the current limit is reached), the blocking protection acts.
No-load monitoring, blocking protection, stall protection (Page 316)
● 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)
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
– for synchronous and reluctance motors (operated with vector control)
- p2182 > p1755 switchover speed, motor model
- With this method, a complete blockage is not detected
Settings
Parameters
Description
p2165
Load monitoring blocking monitoring threshold, upper
p2168
Load monitoring blocking monitoring torque threshold
p2181
Load monitoring response
Response when evaluating the load monitoring.
Table 6-46 Response options for load monitoring (Page 325)
p2182
Load monitoring speed threshold 1
p2183
Load monitoring speed threshold 2
p2184
Load monitoring speed threshold 3
p2186
Load monitoring torque threshold 1, lower
p2188
Load monitoring torque threshold 2, lower
p2190
Load monitoring torque threshold 3, lower
p2191
Load monitoring torque threshold, no load
p2192
Load monitoring delay time
p2193 = 3
Load monitoring configuration
Table 6-45 Setting options for load monitoring (Page 318)