Safety Integrated - Industry - Siemens

Ex. No.
2.7
Powering-up and powering-down the drive
The drives can be started or stopped when the protective
doors are closed and Emergency Stop button S9 is released.
■ When button S2a/b ("On") is pressed, safety combination
A4 is brought into the operational state. The internal line
contactor of the rectifier unit is energized.
■ When button S2a/b ("On") is pressed, contactor K3a/b is
energized and latches; time relay K2a/b is simultaneously
energized. The internal safety relay is energized and a 1 signal
is entered at contact 65 (controller enable) of drive A/B.
The drive restarts.
426 Functional Example No. MC-FE-I-002-V11-EN
■ When button S1a/b ("Off") is pressed, contactor K3a/b is no
longer energized. The drop-out delay of time relay K2a/b is
simultaneously started. When contactor K3a/b drops-out, a
0 signal is entered at contact 65 (controller enable) of the
drive A/B. The drive is immediately braked down to 0 speed
and the pulses cancelled. The internal safety relay of the
drive is no longer energized after the drop-out delay time
of time relay K2a/b has expired. The protective doors can be
opened.