Block Protection - Siemens SINAMICS S120 Installation And Start-Up Manual

Parameters for thermal monitoring and overload responses
S p0290
S p0292
S p0294
S r0036
S r0037
7.9.3

Block protection

Description
The error message "Motor blocked" is only triggered if the speed of the drive is be-
low the variable speed threshold set in p2175. With vector control, it must also be
ensured that the speed controller is at the limit. With V/f control, the current limit
must already have been reached.
Once the ON delay (p2177) has elapsed, the message "Motor blocked" and
fault F7900 are generated.
0.00...210 000.00 1/min
p2175 (120.00)
n_act
r2169
Speed controller at limit
r1407.7
Current limit reached
r1305.12
Fig. 7-15 Block protection
Function diagram for block protection
S 8012
Parameters for block protection
S p2175
S p2177
E Siemens AG, 2004. All rights reserved
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
Basic Information about the Drive System
Power Module overload response
Temperature difference alarm/shutdown threshold
2
Power Module alarm I
Power Module overload
Power Module temperatures
n_act < p2175
p1300 >= 20 –> Vector controls
p1300 < 20 –> V/f characteristics
Control mode
p1300
&
≥
20
<20
&
Torque messages, motor blocked/stalled
Motor blocked speed threshold
Motor blocked delay time
Monitoring and protective functions
t overload
T 0
p2177 (1.000)
0.000...65.000 s
On delay
Motor locked
r2198.6
F7900
7-265