Function library
7-38
L
EDSVS9332P-D21 EN 3.0
7.5.3.3 Absolute positioning with saving
Purpose
Homing is not necessary after mains switching.
Function
•
Resolver or absolute value encoder (single-turn) to X8 is required as position feedback
system.
•
Set positioning mode (C1210) = 2 (absolute positioning with saving).
•
The actual position value (POS-ACTPOS) is automatically stored when the mains is switched
off and reinitialised when the mains is switched on. In the OFF state the motor may rotate with
a deviation of max. ±0,5 revolutions so that the actual position value is correctly initialised after
switching on the mains.
All other function are identical with absolute positioning in chapter 7.5.3.2.
Homing status ”Homing known”
For absolute positioning the correct machine reference is required (”Homing known”)! Out p ut
POS-REF-OK = 1 and homing status C1284 = “REF-OK” .
During commissioning or after homing loss (
(E 7-49)
the drive must be referenced once. According
to the requirements of the application homing can be carried out by “homing function”, “home
setting” or the function “POS-ABS-SET”.
•
With firmware version
≥
V2.5:
– The current homing status is stored at mains switch-off and is initialised correspondingly
when the mains is switched on again.
At the first commissioning the homing status is not set.
•
With firmware version < V2.5:
– Homing status “Homing known” is automatically set when the mains is switched on.
Tip!
Although POS-REF-OK = 1 is displayed the drive must be set once during commissioning or after
a homing loss. This serves to re-establish the correct reference to the machine.
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