Configuration 315
• The maximum pulse frequency range of Encoder 1:
92.17 Accepted pulse freq of encoder 1 = 220 kHz
.
Note: You can use this formula to define the value:
r_max x ppr_enc + 10%, where
• r_max = the maximum motor speed (rpm) used in the application
(or the motor nominal speed)
• ppr_enc = Pulses/revolution of the safety pulse encoder (parameter 92.10).
Set the parameter value in kHz.
Example: When r_max = 1000 rpm and ppr_enc = 1024,
92.17 Accepted pulse freq of encoder 1 becomes 19 kHz:
• 1.1 x (1024 x 1000 rpm / 60) = 18.773 (19).
Download the parameters to the FSO module and validate the safety encoder
configuration before you configure any safety functions.
Diagnostics of FSE-31 encoder interface module
The diagnostics of the FSE module detect encoder failures by monitoring the validity
of the encoder signals (A/_A, B/_B, Z/_Z) and the pulse count. The monitoring is
based on parameters S_ENCGEN.14, 92.10 and 92.17:
• S_ENCGEN.14 defines how big the difference between the speed information in
the internal channels 1 and 2 from FSE to FSO module can be. If the difference is
bigger, FSO module goes into the fail state and stops the system safely (STO).
The speed information is read from the FSE to FSO module through two channels
of 1oo2 structure. The channels may be out of sync by 1 ms. This delay causes
some speed difference between the channels during the motor acceleration or
deceleration.
Suitable value for the speed difference depends on the configuration (motor and
load). Typically it is 2-10 rpm. Too small value will cause unnecessary encoder
faults (A7D8), and too big value will prevent the detection of a problem.
• 92.10 Pulses/revolution sets the pulse count of the safety encoder
• 92.17 Accepted pulse freq of encoder 1 sets the limit for the maximum accepted
frequency from the single signal of the safety encoder to the FSE module.
FSE module detects the following failures with the internal diagnostics functions:
• temperature fault
• max. pulse frequency exceeded fault
• internal voltage fault
• parameter difference fault
• encoder or encoder cable fault.
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