Siemens Sinumerik 840D sl Diagnostic Manual page 1046

System Reactions
System reactions on SINAMICS Alarms
Definition of fault reactions
Description NONE
Reaction None
Description No reaction when a fault occurs
Description OFF1
Reaction Brake along the ramp generator deceleration ramp followed by pulse disable
Description Closed-loop speed control (p1300 = 20, 21)
• n_set=0 is input immediately to brake the drive along the deceleration ramp (p1121).
• When zero speed is detected, the motor holding brake (if parameterized) is closed
(p1215). The pulses are suppressed when the brake application time (p1217) expires.
Zero speed is detected if the actual speed drops below the threshold (p1226) or if the
monitoring time (p1227) started when speed setpoint <= speed threshold (p1226) has
expired.
Closed-loop torque control (p1300 = 23)
• The following applies to closed-loop torque control mode: Reaction as for OFF2
• On switchover to closed-loop torque control mode (p1501):
There is no special braking reaction.
If the actual speed drops below the speed threshold (p1226), the motor holding brake
will be closed if one is parameterized. The pulses are suppressed when the brake
application time (p1217) expires.
Description OFF2
Reaction Internal/external pulse disable
Description Closed-loop speed and torque control
• Instantaneous pulse suppression, the drive "coasts" to a standstill.
• The motor holding brake (if parameterized) is closed immediately.
• Power-on disable is activated.
Description OFF3
Reaction Brake along the OFF3 deceleration ramp followed by pulse disable
Description Closed-loop speed control (p1300 = 20, 21)
• n_set=0 is input immediately to brake the drive along the OFF3 deceleration ramp
(p1135).
• When zero speed is detected, the motor holding brake (if parameterized) is closed.
Pulses are suppressed when the brake application 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.
• Power-on disable is activated.
Closed-loop torque control (p1300 = 23)
• Switchover to speed-controlled operation and other reactions as described for speed-
controlled operation
4-1046
SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
© Siemens AG 2009 All Rights Reserved
03/2009