Safety Integrated - Industry - Siemens

Function description
A structure in compliance with EN 954-1 control Category 3
and EN1037 can be implemented using one SIGUARD safety
combination for the protective doors. The drive is shut down
(stopped) according to stop function Category 1 according to
EN 60204-1.
■ Safety combination for protective door monitoring functions
corresponds to Category 4 (instantaneous enable circuit)
or Category 3 (delayed enable circuit).
■ Circuit for protective door monitoring is monitored through
2 channels in a cross-circuit proof fashion.
Behavior when the protective doors are opened
When the protective doors are opened, it is initiated that the
drive is shut down according to stop Category 1 in compliance
with EN 60204-1. It must be ensured that potentially hazardous
motion must have come to a standstill before a person can
reach the potentially hazardous area!
■ A 0 signal is entered, via the enable contact of safety combination
A1, at contact X101.X (OFF3) of the drive. The
drive is immediately braked down to 0 speed and the pulses
are cancelled. The delay time of safety combination A1 is
simultaneously started and the drive must have come to a
standstill before it expires.
Powering-up and powering-down the drive
The drive can be started or stopped when the protective doors
are closed.
■ When the internal safety relay and line contactor K1 are in
the correct state, safety combination A1 is brought into an
operational state.
■ Line contactor K1 and the internal safety relay of the drive
are energized.
■ When pressing S2 ("On"), contactor K2 is energized and
latches. A 1 signal is entered at contact X101.X (OFF3) of
the drive and the drive starts.
■ Switches S4 and S5 are positively opening position
switches corresponding to EN 1088.
■ The drive is shut down via the internal safety relay and the
higher-level line contactor K1.
■ On circuit of safety combination A1 monitors whether the
line contactor K1, the internal safety relay of the drive, as
well as contactor K2, have dropped-out after the protective
doors have been opened. (This is necessary in the sense of
control Category 3 in compliance with EN 954-1!).
■ The safely delayed enable contacts of safety combination
A1 open after the selected delay time has expired. This
means that the internal safety relay of the drive (1st shutdown
path!) and line contactor K1 (2nd shutdown path!)
are no longer energized.
■ If the internal safety relay functions incorrectly or if line
contactor K1 has not dropped-out, then its checkback signal
contacts X533.1/2 in the on circuit of the safety combination
A1 are not closed. The safety combination cannot be
switched-in.
■ When button S1 ("Off") is pressed, contactor K2 is no longer
energized and a 0 signal is entered at contact X101.X
(OFF3) of the drive. The drive is immediately braked down
to 0 speed and the pulses are cancelled. If the protective
doors are opened, the safely delayed enable contacts of
safety combination A1 open after the selected delay time
has expired. This means that the internal safety relay of the
drive (1st shutdown path!) and line contactor K1 (2nd
shutdown path!) are no longer energized.
Functional Example No. MC-FE-I-001-V11-EN 403
Ex. No.
1.4