Siemens Sinamics S120 Diagnostic Manual page 937

Designation OFF3
Reaction Brake along the OFF3 down ramp followed by pulse disable
Description Closed loop speed control (p1300 = 20, 21)
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Closed loop torque control (p1300 = 23)
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Designation STOP1
Reaction -
Description In preparation
Designation STOP2
Reaction n_set = 0
Description •
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Designation IASC/DCBRAKE
Reaction -
Description •
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Designation ENCODER
Reaction Internal/external pulse disable (p0491)
Description The fault reaction ENCODER is applied as a function of the setting in p0491.
Factory setting:
p0491=0 → Encoder fault results in OFF2
Alarms
Diagnostics Manual, 07/2010, 6FC5398-8BP40-0BA0
n_set=0 is input immediately to brake the drive along the OFF3 down ramp (p1135).
When zero speed is detected, the motor holding brake (if parameterized) is closed. The pulses
are suppressed when the closing time of the holding brake (p1217) expires.
Standstill is detected when the speed actual value of the speed threshold (p1226) is undershot
or when the monitoring time (p1227) started when speed setpoint <= speed threshold (p1226)
has expired.
Switch-on inhibit is activated.
Switchover to closed-loop speed-controlled operation and other reactions as described for
closed-loop speed-controlled operation
n_set=0 is input immediately to brake the drive along the OFF3 down ramp (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 (p1232, p1233, p1234).
8.3 System reactions for SINAMICS alarms
System reactions
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