Safety Integrated - Industry - Siemens

Behavior when Emergency Stop is issued
Button S3 ("Emergency Stop") is used to issue an Emergency
Stop command. This initiates that the drive is shut down according
to stop Category 1 in compliance with EN 60204-1.
■ 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. At the same time, the drop-out delay of timer
relay K2a and the delay time of the safety relay A1 are
started; the drive must have come to a standstill before
they expire.
Behavior when the protective doors are opened
Button S1 ("Off") requests that the protective doors are
opened. This initiates that the drive is shut down according to
stop Category 1 in compliance with EN 60204-1.
■ Contactor K3 is longer energized. A 0 signal is entered, via
its contact (NO contact), at contact X101.X (OFF3) of the
drive. The drive is immediately braked down to 0 speed and
the pulses are cancelled. At the same time, the drop-out
delay of time relay K2a is started and before this time has
expired, the drive must have come to a standstill.
■ After the drop-out delay time of time relay K2a has expired,
the internal safety relay of the drive is no longer energized
(1st shutdown path!). At the same time, the latch (tumbler)
Y1 of the protective doors is opened.
Powering-up the drive
The drive can be started when the protective doors are closed
and Emergency Stop button S3 is released.
■ When pressing button S2 ("On"), safety combination A1 is
brought into the operational state. The coil of latch (tumbler)
Y1 is no longer energized, the protective doors are
interlocked. Safety combination A2 is again in an operational
state. Line contactor K1 is energized..
■ Contactor K3 is energized and latches and at the same
time, time relay K2a is energized. The integrated safety
relay is energized, a 1 signal is entered at contact X101.X
(OFF3) of the drive. The drive restarts.
■ The internal safety relay of the drive is no longer energized
after the drop-out delay time of time relay K2a has expired
(1st shutdown path!).
■ After opening the safely delayed enable contact of safety
combination A1, line contactor K1 is no longer energized
and the drive is electrically isolated from the line supply
(2nd shutdown path!).
■ The checkback signal from line contactor K1 is monitored in
the on circuit of safety combination A1. If the contactor
does not drop-out due to an erroneous function, a restart
after Emergency Stop is prevented.
■ When the protective doors are opened the safety monitoring
A2 of the safety circuit is interrupted. Before the
selected delay time of safety combination A2 has expired,
the internal safety relay of the drive must have already
dropped-out. Its checkback signal contacts X533.1/2 indicate
that the drive is in a safe condition.
■ After the selected delay time has expired, the safely
delayed enable contacts of the safety combination A2
open.
■ If the internal safety relay of the drive is functioning correctly,
its checkback signal contact X533.1/2 is closed, line
contactor K1 does not drop-out. If the internal safety relay
does not function correctly, its checkback signal contacts
X533.1/2 are not closed, line contactor K1 drops-out and
isolates the drive from the line supply (2nd shutdown
path!).
Functional Example No. MC-FE-I-001-V11-EN 397
Ex. No.
1.1