Safety Integrated - Industry - Siemens

Behavior when Emergency Stop is issued
Emergency Stop is initiated using button S3 ("Emergency
Stop"). This initiates that the drive is shut down according to
stop Category 1 in compliance with EN 60204-1.
■ A 0 signal is entered at contact 65 (controller enable RF) of
the drive via the enable contacts of safety combination A1.
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 no longer energized and a 0 signal is
entered at contact 65 (controller enable RF) of the drive via
its contact (NO contact). 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. The internal line contactor of the rectifier unit
is energized.
■ Contactor K3 is energized and latches and at the same
time, time relay K2a is energized. The integrated safety
relay is energized and a 1 signal is entered at contact 65
(controller enable) 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, the internal line contactor of the rectifier
unit is no longer energized and the drive is electrically isolated
from the line supply (2nd shutdown path!).
■ The checkback signal of the internal line contactor of the rectifier
unit is monitored in the on circuit of safety combination
A1. If the contactor does not drop-out due to an incorrect
function, then the drive is prevented from restarting after an
Emergency Stop.
■ 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 AS1/2 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 contacts AS1/2 are closed and
the internal line contactor of the rectifier unit does not
drop-out. If the internal safety relay does not function correctly,
its checkback signal contacts AS1/2 are not closed,
the internal line contactor of the rectifier unit drops-out
and isolates the drive from the line supply (2nd shutdown
path!).
Functional Example No. MC-FE-I-002-V11-EN 413
Ex. No.
2.1