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, 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.
■ If the drive is stationary (speed = 0), then PLC output DO2
to the internal safety relay of the drive is reset. The internal
safety relay of the drive drops-out and its checkback signal
contacts X533.1/2 close (1st shutdown path!).
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 speed 0 and the pulses
are cancelled. At the same time, the state of the safety
combination is signaled to the control.
■ 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 when the protective doors are closed
and Emergency Stop button S3 is released.
■ When button S1 ("On") is pressed, safety combination A1 is
brought into the operational state. Safety combination A2
is again in an operational state. Line contactor K1 is energized.
■ The internal safety relay is energized (PLC output DO2), a 1
signal is entered (PLC output DO3) at contact X101.X
(OFF3) of the drive. The drive restarts.
■ Before the selected delay time of safety combination A1
expires, the internal safety relay of the drive must have
already dropped-out and its checkback signal contacts
X533.1/2 indicate that the drive is in a safe condition.
■ The safely delayed enable contacts of safety combination
A1 open after the selected delay time has expired. This
means that line contactor K1 is no longer energized and the
drive is electrically isolated from the line supply.
■ The checkback signal of line contactor K1 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.
■ If the drive is stationary (speed = 0), then PLC output DO2
to the internal safety relay of the drive is reset. The internal
safety relay of the drive drops-out and its checkback signal
contacts X533.1/2 close. (1st shutdown path!)
■ The safely delayed enable contacts of safety combination
A2 open after the selected delay time has expired. This
delay time must be set so that the checkback signal of the
internal safety relay already indicates that the drive is in a
safe condition.
■ If the delay time of the contactor combination A2 has been
correctly set and the function of the internal drive safety
relay is correct, line contactor does not drop-out. If the
delay time has been set too short or the internal safety relay
is not functioning correctly, line contactor K1 drops-out and
isolates the drive from the line supply (2nd shutdown
path!).
■ When button S2 is pressed ("Off"), PLC output DO3 is reset
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 drive is stationary (speed =
0), then the PLC output DO2 to the internal safety relay of
the drive is reset. If the protective doors are opened, the
safely delayed enable contacts of safety combination A2
open after the selected delay time has expired (1st shutdown
path!). If the internal safety relay of the drive has still
not dropped-out as a result of an incorrect function or a
fault (PLC), 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 407
Ex. No.
1.6