6 encoder evaluation, Encoder evaluation, Data for – Lenze 9400 User Manual
Page 236: Function, 6encoder evaluation
6
Encoder evaluation
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Lenze · Servo-Inverter 9400 HighLine · Reference manual · DMS 10.0 EN · 11/2013 · TD05/06
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6
Encoder evaluation
This chapter contains information on how to use feedback systems for the motor control.
See also:
Danger!
If the encoder/resolver is used as motor encoder:
In case of error, safe operation of the motor is no longer guaranteed!
When servo control is used:
• For the (open circuit) monitoring of the encoder/resolver for reasons of safety always
the "Fault" response (Lenze setting) should be set!
When V/f control is used:
• For this type of motor control, the drive basically is to coast down after an encoder
failure and may not stop, therefore the "Warning" response is to be set for the (open
circuit) monitoring in this case!
Parameters for the (open circuit) monitoring:
•
: Response to open circuit of encoder
•
: Response to open circuit of resolver
•
: Response to communication error of encoder
Note!
The encoder position is stored safe against mains failure in the memory module and is
therefore known to the drive control even after the mains has been switched.
With regard to their position resolution, higher-level applications are based on the
resolution of the encoder which is activated for position control.
Behaviour of the home position after mains switching
If the home position/information is also to be available after mains switching, the
= "1: Received" is required.
• Another condition for keeping the home position/information after mains switching
is the compliance with the maximum permissible angle of rotation of the encoder,
which can be set in
.
• When resolvers or single-turn absolute value encoders are used and the mains is
switched off (24 V supply off), the encoder may only be moved by ½ revolution since
otherwise the home position will get lost due to the ambiguity of the encoder
information.
Note!
A digital position encoder connected to the "LS_Feedback" system block must have a
position resolution of exactly 16 bits if a safety module SM301 is used together with the
safe speed detection.