Lenze ECSCMxxx - Manual (Page 112)

Commissioning
Setting of the feedback system for position and speed control
Resolver as absolute value encoder
6
l
112 EDBCSXM064 EN 11.0
6.7.2 Resolver as absolute value encoder
If the following requirements are met, a resolver (or single−turn absolute value encoder)
can take over the function of a multi−turn absolute value encoder:
ƒ When the axis module is switched off, the reference is known.
ƒ Until the axis module is connected for the next time, it is ensured that the position
of the machine part does not change (e.g. by using a brake). When switched off, the
motor encoder may maximally move +/− half a revolution.
ƒ C3002 = 1 (initialisation with saved actual position after power on)
At switch off, the actual position is saved fail−safe. After switch on, the actual position is
re−initialised with this value. Turning the drive by maximally ± ½ revolution of the position
encoder when the axis module is switched off will be detected and considered when the
actual position is initialised (loaded).
General formula for the calculation of the maximum resolver rotation when the axis
module is switched off, in particular for multi−pole resolvers (number of pole pairs > 1):
Max. rotation
+ "
ǒ
180°
number_of_pole_pairs
Ǔ
Code Possible settings IMPORTANT
No. Designation Lenze/
{Appl.} Selection
C3002 NoChangeOf
Pos
0 Resolver as absolute value
encoder
^ 112
0 ChangeOfPos After "mains off/on", homing
has to be carried out.
The actual position is initialised
with the value "0".
1 NoChangeOfPos The actual position value is
initialised with the position
value at "Mains off" and is used
further at "Mains on".
Homing is not required.
Note: With "Mains off" the
feedback system must rotate less
than
± 0.5 revolutions.