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System Reactions on Alarms 01/2008 System reactions on SINAMICS alarms 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 speedcontrolled operation 4-948 © Siemens AG 2008 All Rights Reserved SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 01/2008
