Safety Functions Integrated In The System/Drive; Safe Standstill (Sh) - Siemens SINUMERIK 840D sl Function Manual

Safety Functions Integrated in the System/
Drive
6.1

Safe standstill (SH)

Note
This Chapter describes the safety function "safe standstill" (SH), controlled from
the safety-relevant motion monitoring functions. The function is based on the
safety functions SH/SBC of the drive (see Chapter 4). Fig. 6-1 shows the
interrelationships.
The safety functions SH and SBC, 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/SH initiated in the drive (i.e. a system error in the drive or SH/SBC
selection via terminal) is however not available as two channel SGA "STOP A/B
active" for the safety-relevant motion monitoring functions. There is only a
single-channel signal "pulses cancelled" present.
Description
The "safe standstill" function is based on the pulse cancellation function integrated
in the Motor Modules of the SINAMICS S120 (see Section 4.2 "Safe standstill").
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 SH/SBC integrated in the drive are, corresponding 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, 2006. All rights reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
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