Safety Functions Integrated In The System/Drive; Safe Stop (Sh) - Siemens SINUMERIK 840D sl Function Manual
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Safety Functions Integrated in the System/
Drive
6.1
Safe stop (SH)
Note
This Chapter describes the safety function "safe standstill" (SH), controlled from
the safety–related motion monitoring functions. The function is based on the safety
functions STO/SBC of the drive (see Chapter 4). Fig. 6-1 shows the
interrelationships.
The safety functions STO, SBC and SS1, integrated in the drive, controlled via the
drive terminals, are described in Chapter 4. Control via terminals and from the
motion monitoring functions is in parallel and can be used independently of one
another.
A Stop A/STO initiated in the drive (i.e. a system error in the drive or
STO/SBC/SS1 selection via terminal) is however not available as two–channel
SGA "STOP A/B active" for the safety–related motion monitoring functions. There
is only a single–channel signal "pulses cancelled" present.
Description
The "safe standstill" function is based on the pulse cancellation (start inhibit) func-
tion integrated in the Motor Modules of the SINAMICS S120 (see Chapter 4.2,
"Safe Torque Off (STO)".
There are two shutdown paths that are independent of one another that ensure
that when a component fails, the drive is always brought into a safe condition.
The safe standstill function safely disconnects the energy feed to the motor in the
event of a fault or in conjunction with a machine function.
The following must be carefully observed when controlling/energizing SH from the
motion monitoring functions.
– The safety functions STO/SBC/SS1 integrated in the drive are, correspond-
ing to the description in Chapter 4 "Safety Functions Integrated in the Drive"
fully effective (parameters, alarms etc.). The standard pre–assignment
(default setting) of the associated parameters is generally sufficient in the
context of the motion monitoring functions.
© Siemens AG 2008 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
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