Safety Shutdown (E-Stop) - Siemens SINAMICS DCM User Manual

Introduction

1.7 Safety shutdown (E-STOP)

1.7 Safety shutdown (E-STOP)
Note
The E-STOP function alone does not represent a safety function.
The E-STOP function forces the "line contactor closed" relay to drop out, activating the relay
contact (terminals XR1-109 and -110) for the main contactor control within approximately 20
ms, independent of the semiconductor components and Control Unit (CUD) functions. If the
CUD is operating correctly, entering I = 0 via the control ensures that the main contactor
switches in a no-current condition. The drive coasts down once E-STOP has been entered.
The E-STOP function is initiated when the switch between terminals XS1-105 and XS1-106
is opened.
The E-STOP function causes the drive to go into the "Switching on inhibited" operating state.
This must be acknowledged by activating the "shutdown" function e.g. by opening terminal
X177.12.
Sequence when initiating an E-STOP:
1. The ramp-function generator, n controller, and I controller are disabled.
2. The armature current is reduced to zero
3. a) p51616 = 0: E-STOP acts like OFF2 (firing pulses are inhibited as soon as I = 0).
b) p51616 = 1: E-STOP immediately stops firing pulses from being output (without waiting for I = 0).
4. The "Close operating brake" signal is output (r53210.0 = 1, for p50080 = 2).
5. Operating state o10.0 or higher is reached.
6. The field current is maintained at a fixed level
(i.e. there is no increase in the field current, even on exiting the field-weakening range).
7. The "Close line contactor" relay (terminals XR1-109 and -110) drops out.
8 The drive coasts down (or is decelerated by the operational brake).
9 The wait time (to be set at p50258) elapses.
10. The field is reduced to a parameterizable value (p50257).
11. Once n < nmin (p50370, p50371), the "Close holding brake" signal is output (r53210.0 = 1, for p50080 = 1).
Note
20 ms after an E-STOP has been initiated (even if point 7 in this sequence has not yet been
reached), the "Close line contactor" relay (terminal XR1-109 and XR1-110) is opened (drops
out), initiated by the hardware.
16
Application document for functional safety STO, SS1 (ISO 13849-1)
Compact User Manual, 09/2016, A5E34871844AM