Lenze 9300 - Measuring Systems for Absolute Value Encoders

Function library
7-41
L
EDSVS9332P-D21 EN 3.0
7.5.4.2 Measuring systems for absolute value encoders
9300POS008
0
a c t . h o m e p o s i t i o n
( I n p u t : n e g . v a l u e )
C 1 2 2 7 ( C 1 2 2 0 / 8 )
L i m i t p o s i t i o n
n e g a t i v e
L i m i t p o s i t i o n
p o s i t i v e
C 1 2 2 4
C 1 2 2 3
0
a c t . h o m e o f f s e t
C 1 2 2 5 ( C 1 2 2 0 / 7 )
a c t . t a r g e t p o s i t i o n
C 1 2 2 0 / 1
H o m e
p
o s i t i o n
R e a l m e a s u r i n g s y s t e m
M a c h i n e
m e a s u r i n g
s y s t e m
0
+ m a x
( O v e r f l o w )
D i s p l a y r a n g e a b s o l u t e v a l u e e n c o d e r ( C 1 2 2 0 / 5 )
Fig. 7-19 Measuring systems with absolute value encoders
For absolute value encoders the same conditions than for positioning apply (see above)concerning
the measuring systems and their references.The only difference is the definition of the reference
point.
Encoder zero is defined as reference point.
• Actual home position
– Use “actual home position” to move the machine zero further into the traversing range
(negative value moves the machine zero in positive direction).
– The “actual home position” is indicated under C1220/8 in “units” and C1221/8 in “incr”.
• Initialisation
– After switch-on the ”actual home position” is initialised with the ”home position”.
–“Actual home offset” (C1220/7, C1221/7) is set equal to the input value “home offset”
(C1225).
• During operation
– After changing, C1227 is not directly transferred to the ”actual home position”.During
program operation, the transfer can be initialised via the function ”Acceptance home
position (C1227)” (setting under PS mode (C1311) = 16).
• Set homing value
– The program function ”set reference” enables the machine zero point to be set at the current
position. Therefore the ”actual home position” is set to the negative value of the actual
position value (POS-ACTPOS).
– Transfer the value manually under C1220/8 to C1227 and save it under C0003 to ensure that
the setting is available after mains switching.
– The “actual reference offset” (C1220/7) is set equal to the input value “reference offset”
(C1225) when setting the home position.
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