Siemens SINAMICS DCM Manual page 513

Descriptions of functions
10.9 Switch on, switch off, enable
● With edge triggering, an automatic restart following a brief interruption in the electronic
power supply voltage is not possible.
● To ensure that "Shutdown" functions even when rewiring is carried out, current or torque
lower limits are specified, or additional setpoints are supplied, certain functions are
disabled automatically when "Shutdown" is applied.
– All torque limits are disabled during braking to n < nmin.
– Of the current limits, only the system current limit (p50171 and p50172), speed-
10.9.2 OFF2 (disconnection) - control word bit 1
The OFF2 signal is LOW active (log. "0" state = disconnection).
Procedure for applying disconnection:
1. The ramp-function generator, n controller, and Ia controller are disabled.
2. Reduction in armature current
3. The firing pulses are disabled.
4. "Close operational brake" is output (r53210.0 = 1, where p50080 = 2).
5. Operating state o10.0 or higher is reached.
6. The field current is maintained at a fixed point (i.e. there is no increase in the field current,
even on exiting the field-weakening range).
7. The "Line contactor closed" relay (terminal XR1-109 and XR1-110) drops out.
8. The drive coasts down (or is decelerated by the operational brake).
9. The parameterizable wait time (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, where p50080 = 1).
10.9.3 OFF3 (quick stop) - control word bit 2
The OFF3 signal is LOW active (log. "0" state = quick stop).
Procedure for applying "Quick stop":
1. The ramp-function generator is disabled.
2. A speed setpoint of zero is applied.
3. Deceleration along the down ramp acc. to p50296, p50297, p50298
4. Wait until n < nmin (p50370, p50371).
5. "Close operational or holding brake" (r53210.0 = 1) is output.
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dependent current limit, and current limit resulting from I
are enabled.
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t monitoring of the power unit
2
SINAMICS DCM DC Converter
Operating Instructions, 02.2015, A5E34763375/RS-AA/001