Siemens SINAMICS G120 List Manual page 994

4 Faults and alarms
4.1 Overview of faults and alarms
Table 4-2 Fault reactions, continued
List PROFIdrive
OFF3 QUICK
STOP
STOP2 -
IASC/DCBRK -
ENCODER -
994
Reaction
Brake along the Closed loop speed control (p1300 = 20, 21)
OFF3 down ramp
• n_set = 0 is input immediately to brake the drive along the OFF3
followed by pulse
ramp down (p1135).
disable
• When zero speed is detected, the motor holding brake (if
parameterized) is closed. The pulses are suppressed when the
holding brake's closing time (p1217) expires.
Zero speed is detected if the actual speed drops below the
threshold in p1226 or if the monitoring time (p1227) started when
speed setpoint <= speed threshold (p1226) has expired.
• Switching-on inhibited is activated.
Torque control (p1300 = 22, 23)
• Changeover to speed-controlled operation and other reactions as
described for speed-controlled operation.
n_set = 0 • n_set = 0 is input immediately to brake the drive along the OFF3
ramp down (p1135).
• The drive remains in closed-loop speed control.
• For synchronous motors, the following applies:
-
If a fault occurs with this fault reaction, an internal armature short-
circuit is triggered.
The conditions for p1231 = 4 must be observed.
• For induction motors, the following applies:
If a fault occurs with this fault reaction, DC braking is triggered.
DC braking must have been commissioned (p1230 to p1239).
Internal/external The fault reaction ENCODER is applied as a function of the setting in
pulse disable p0491.
(p0491)
Factory setting:
p0491 = 0 --> Encoder fault causes OFF2
Notice:
When changing p0491, it is imperative that the information in the
description of this parameter is carefully observed.
Description
SINAMICS G120 CU250S-2 Control Units
List Manual, 09/2017, A5E33842890