Siemens SINAMICS S120 Function Manual page 548

Applications
11.5 Tolerant encoder monitoring with SMC30
Settable hardware filter
p0438 Filter time rectangular signal encoder
only discrete values in the following increments are supported:
No filtering, 0.04 µs, 0.64 μs, 2.56 μs, 10.24 μs, 20.48 µs
Any value between 0 and 100 µs can be set. If you enter a value other than one of the
discrete values specified above, the firmware automatically sets the next closest discrete
value. This is carried out by the drive without alarm or fault message.
r0452 Effective filter time rectangular signal encoder
The display parameter shows the filter time currently effective in the processor.
The influence of the filter time on the maximum possible speed can be calculated as follows:
Maximum speed: n_max [rpm] = 60 / (p0408 * 4 * r0452)
p0408: Rotary encoder pulse number,
r0452: Filter time rectangular signal encoder display.
Example:
If p0408 = 2048 and r0452 = 10.24 [μs], then n_max equals:
n_max = 60 / (2048 * 4 * 10.24e-6) = 715 [rpm].
This means that the motor can operate at max. 715 rpm with this filter time.
Extension of encoder operating modes for HTL/TTL encoders
Track monitoring A/B < -- > -A/B with rectangular signal encoders
The following parameters must be set:
● p0404.3 = 1 switches to the rectangular signal encoder
● p0405.0 = 1 sets the signal to bipolar
● p0405.2 = 1 activates track monitoring
If the encoder is specified in the list for p0400 and has been selected, the p0405 parameters
are set automatically and cannot be changed (for more information, see parameter p0400 in
LH1).
● All track monitoring functions can be individually evaluated with the new hardware (order
● A group fault message is generated as an OR operation of individual fault messages.
● It is still possible to diagnose individual fault messages.
Note
For CU310, CUA32, D410, and SMC30 (MLFB 6SL3055-0AA00-5CA0 and 6SL3055-0AA00-
5CA1 only), fault 31117 is output (with active track monitoring) if a rectangular signal
encoder without an R track is connected. On the encoder connection, the encoder supply
ground (pin 7) must be connected to RP (pin 10) and the encoder supply (pin 4) to RN (pin
11).
Zero mark detection
This function is activated with parameter setting p0437.1.
548
number -CA2) and, with firmware version 2.6 and higher, for HTL and TTL encoders as
well.
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Drive functions