4 Faults and alarms
4.1 Overview of faults and alarms
SINAMICS G120 Control Units CU240B-2/CU240E-2
766 List Manual (LH11), 01/2016, A5E33839529
OFF2 COAST
STOP
Internal/external
pulse disable
Closed-loop speed and torque control
• Instantaneous pulse suppression, the drive "coasts" to a standstill.
• The motor holding brake (if one is being used) is closed
immediately.
• Switching-on inhibited is activated.
OFF3 QUICK
STOP
Brake along the
OFF3 down ramp
followed by pulse
disable
Closed loop speed control (p1300 = 20, 21)
• n_set = 0 is input immediately to brake the drive along the OFF3
ramp down (p1135).
• 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.
STOP2 - 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.
IASC/
DCBRAKE
-- • 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).
Table 4-2 Fault reactions, continued
List PROFIdrive Reaction Description
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