Safe Standstill (Sh) - Siemens SINUMERIK 840D Description Of Functions

11.03

3.3 Safe standstill (SH)

The "safe standstill" function is based on the pulse cancellation function
Description
integrated in the drive modules of the SIMODRIVE 611A/D (start inhibit).
References:
A second pulse shutdown path has been added to the existing pulse
cancellation function on the SIMODRIVE 611 digital Performance and
Standard 2 closed-loop control.
The safe standstill function safely disconnects the energy feed to the motor in
the event of a fault or in connection with a machine function.
A safe standstill is executed in two channels, i.e. by de-energizing an internal
relay via a signal path of the drive bus on the one hand and by de-energizing
terminal 663 on the drive module on the other. The two-channel checkback
signal is also realized on one hand via the drive bus and on the other hand via
the drive terminals AS1/AS2. From NCU software release 06.03.30, the pulse
enable can also be read-back internally for all control modules. This means that
it is not necessary to read back signals from terminal AS1/AS2.
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Function features The main features of the safe standstill function are as follows:
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The safe standstill function requires the following SW and HW
Prerequisites
(refer to Chapter 2.9, "System prerequisites"):
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Selecting/ The "safe standstill" function corresponds to an external STOP A. This makes it
de-selecting SH possible to explicitly select SH not only via internal events (STOP A with limit
value violation etc.), but also via SGE.
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© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
/PJ1/, Planning Guide SIMODRIVE 611
Caution
The machine manufacturer must take all of the appropriate measures to
prevent any motion after the energy feed to the motor has been disconnected
(e.g. to prevent suspended/vertical axes from dropping).
The motor cannot be started unintentionally or by accident
The energy feed to the motor is safely disconnected
The motor is not electrically isolated from the drive module
611 digital Performance control module
611 digital Standard 2 control module
High Standard
High Performance
Software version with SI
Safe standstill is activated after STOP A.
Safe standstill is automatically activated from each monitoring channel (via
single channel) when testing the shutdown paths.
3 Safety-Related Functions
3.3 Safe standstill (SH)
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