Checking The Start Inhibit - Siemens 6SN1123-1AA00-0DA2 Configuration Manual

02.03
05.01
8.5.5

Checking the start inhibit

The safety relay is an important component associated with the safety and
availability of the machine. This is the reason that if the system functions incor-
rectly, the control unit together with the safety relay must be replaced. Function
checks are required at regular intervals in order to detect an incorrect function.
The intervals specified in the appropriate regulation BGV A1 §39, Paragraph 3
are decisive for the intervals in which the system must be checked. This is the
reason that the function check/test must be performed – depending on the ap-
plication conditions; however, it must be performed at least once a year and in
addition, after the system has been commissioned for the first time as well as
when modifications and repairs have been made.
S
S
S
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Warning
!
Only qualified personnel may perform these checks carefully observing the
necessary safety measures.
After the start inhibit check has been completed, all of the changes made to the
control as part of this check must be reversed.
© Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
8.5 Start inhibit in the drive modules/safe standstill
The drive pulses must be inhibited when the voltage at terminal 663 is re-
moved. Further, the feedback signal contacts AS1/AS2 of the start inhibit
must close. The drive "coasts down".
Withdrawing the protective devices, e.g. opening the protective door/guard
while the drive is running. The drive must be braked as quickly as possible
and then shut down. In so doing, no inadmissible hazard may occur.
All of the possible fault/error cases that can occur must be individually simu-
lated in the signal lines/cables between the feedback signal contacts and
the external control as well as the signal evaluation functions of this control
– for example, by interrupting the start inhibit monitoring circuit at terminal
AS1–AS2.
The monitoring circuit AS1 – AS2 should be disconnected for this purpose.
In all of the simulated fault situations, the line contactor must isolate all of the
drives of the machine or system from the line supply.
If there is a connection between the NE or monitoring module power supply,
terminal 500/M500 to the power DC link P600/M500, then this must be
safely and reliably disconnected at the same time as the line contactor is
opened, e.g. using contactors.
8 Important Circuit Information
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