Safe Direction Without Encoder - Siemens Sinamics S120 Function Manual

4.2.11.2

Safe Direction without encoder

Set p9506 = 1 or p9506 = 3 (factory setting = 0) to activate Safety Integrated functions
without encoder. You can also make this setting by selecting "Without encoder" on the
STARTER safety screen.
Not e
Def aults
For commissioning, also pay attention to the description in Chapter "Default settings for
commissioning Safety Integrated functions without encoder (Page 232)."
Differences between SDI with encoder and SDI without encoder
● For Safe Direction without encoder, after pulse suppression the drive is unable to
determine the current speed. For this operating state, the behavior is defined using
parameter p9509.8:
– p9509.8 = 1
– p9509.8 = 0
● Due to the less precise position recognition, "Safe Direction without encoder" requires a
larger tolerance (p9564) compared with the function with encoder.
Not e
No det ection of a change in direction by means of p1820 or p1821
If the direction of rotation is reversed via p1820 or p1821, then safe monitoring is still
possible: However, in this case, the setpoint limitation r9733 is calculated with the wrong
direction of rotation. A reversal of the rotational direction with p1820 or p1821 therefore does
not make sense.
Restart after pulse cancellation for p9509.8 = 0
If the drive has been switched off via OFF1/OFF2/STO etc., the following steps need to be
carried out before a restart can be performed:
1. Case •
Safety Integrated
Function Manual, (FHS), 07/2016, 6SL3097-4AR00-0BP6
The status signal displays "inactive".
The status signal displays "active", and the drive takes on the state STO.
State after switching on
SDI selected
•
STO selected
•
Pulse suppression active
•
Deselect STO
•
The drive enable must be issued within 5 seconds via a positive edge at OFF1, other-
•
wise STO is reactivated.
Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
117