Safety Integrated - Industry - Siemens

Behavior when Emergency Stop is issued
Button S3 ("Emergency Stop") is used to initiate 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
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
A2, 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 time of
time relay K2a is started and before this time has expired,
the drive must have come to a standstill.
■ 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!).
■ 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.
Powering-up and powering-down the drive
The drive can be started or stopped 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. Line contactor K1 is
energized.
■ When pressing button S2 ("On"), contactor K3 is energized
and latches; time relay K2a is simultaneously energized.
The internal safety relay is energized and 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.
■ 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!).
■ When button S1 ("Off") is pressed, contactor K3 is no longer
energized and the drop-out delay of time relay K2a is simultaneously
started. When contactor K3 drops-out, a 0 signal
is entered at contact X101.X (OFF3). The drive is immediately
braked down to 0 speed and the pulses are cancelled.
The internal safety relay of the drive is no longer energized
after the drop-out delay time of time relay K2a has expired.
The protective doors can be opened.
Functional Example No. MC-FE-I-001-V11-EN 399
Ex. No.
1.2