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) 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
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 at contact 65 (controller enable) of the
drive via the enable contacts of safety combination A2. The
drive is immediately braked down to 0 speed and the pulses
are cancelled. At the same time, the switch-out delay 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!).
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. The internal line contactor
of the rectifier unit 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 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.
■ 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 AS 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 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!).
■ 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 65 (controller enable) of the drive. 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-002-V11-EN 415
Ex. No.
2.2