Lenze 8400 - Manual (Page 307)

Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
307
6 I/O terminals
6.1 Digital terminals
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
6.1.1.2 Using DI1(5) and DI2(6) as frequency inputs
General information on using the input terminals as frequency inputs
The frequency inputs serve to detect HTL encoders with any number of increments and single-track
and two-track signals. Single-track signals can be evaluated with or without rotation signal.
Example for DI5/DI6 (in accordance with the preceding note):
• Number of encoder increments: 512 pulses / motor revolution
• Reference speed (C00011): 1500 rpm
• Speed setpoint: 100 %
• Result: The speed or the number of increments is too high!

Tip!
From version 06.00.00 onwards , the LS_DigitalInput system block can also provide the
encoder position. Detailed information on this topic is provided in chapter " Output of the
encoder position of the DI1/DI2 frequency input ". ( 321)

Note!
• Make sure that, when motor control with speed feedback is in use, the maximum
input frequency of the respective input terminal is not exceeded.
• DI1/DI2: f
max
= 100 kHz
• DI5/DI6: f
max
= 10 kHz
• If the encoder signal is used as an actual speed value:
Number of encoder pulses / revolution ≤ 8192!
Input frequency
1500 rpm
60 s
------------------------- 512 pulse × 12800 pulse/s 12.8 kHz = = =