Sequence And Timing When Using The Start Inhibit - Siemens 6SN1123-1AA00-0DA2 Configuration Manual

8 Important Circuit Information
8.5 Start inhibit in the drive modules/safe standstill
8.5.4

Sequence and timing when using the start inhibit

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The drives must have been stopped before terminal 663 is inhibited and the
start inhibit is activated.
The drives can be stopped, e.g. by ramping down the drives in a controlled way
using the NC program, inhibiting the drive–enable terminal 64 or the axis–spe-
cific controller enable, terminal 65.
Under fault conditions, the equipment must be safely disconnected and isolated
from the line supply using the line contactor.
If a fault occurs when actuating the start inhibit, then this fault must be removed
before the isolating mechanical protective devices (e.g. guards) to the working
space of the machine or plant are opened. After the fault has been removed,
the handling sequence for the start inhibit must be repeated. Under fault condi-
tions, all of the drives, machine and the plant must be shutdown.
If one of the following faults occurs with terminal 663 de–energized and the pro-
tective devices withdrawn, then under all circumstances, EMERGENCY STOP
must be immediately initiated:
S
The feedback signaling contacts AS1/AS2 remain open; the start inhibit is
not activated.
S
There is a fault in the external control circuit itself.
S
There is a fault in the signal cables of the feedback signal contact.
All of the drives of the machine/plant must be disconnected and isolated from
the line supply via the line contactor.
If the control of the start inhibit has been correctly integrated in the external
safety–relevant drive control – and has been carefully checked – the drives in
the isolated working zone of the machine are secure against undesirable start-
ing and personnel can enter or access the hazardous zone that has been re-
stricted.
Notice
The relevant regulations for setting–up operation must be carefully observed.
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
© Siemens AG 2012 All Rights Reserved
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