Lenze EVS9332xP - Manual (Page 67)

Function library
Positioning control
3.4.5 Absolute value encoder
3−39
l
EDSVS9332P−EXT DE 2.0
Installation
The absolute value encoder must be mechanically mounted so that the encoder zero point is outside
the travel range. Otherwise a value overflow would occur in the encoder within the travel range. This
would result in a wrong actual position value after mains switching.
Commissioning
Observe the commissioning sequence to avoid a reset of C0420 to default setting.
1. Select the connected absolute value encoder under C0025 or C0495.
– After the selection the fault SD7 is indicated since the encoder has not yet been initialised.
The initialisation only takes place by mains switching. (see step 5.).
2. Enter the number of increments of the absolute value encoder under C0420.
– By entering the number of increments the data format is automatically considered during
initialisation. The data format determines the resolution to be reached of the initialised
absolute value.
3. Carry out a fine adjustment under C1227 (home position).
– By entering a negative value (see Fig. 3−13) the machine zero point is shifted into the
traversing range by means of the home position to enable the input of reasonable position
limit values and monitoring of the traversing range. (
¶ 3−37)
4. Save the settings under C0003.
5. Switch of the mains voltage off and on again.
– The absolute value encoder is initialised. The fault indication SD7 is reset.
Tip!
l Absolute value encoders have a finite area, e. g. 4096 revolutions. Within this area they can
also be moved in a switch−off state; nevertheless they are able to deliver the correct absolute
actual position value after switching on the mains.
l The overflow point of the encoder amounts to 65536 inc/rev × 4096 rev = 268.435.456 inc.
(display: C1221/5)
– When the area to be described is exceeded the fault P12 is indicated.