182
ifm
System Manual
ecomat
mobile
SmartController (CR2500, CR2502) V05
PWM in the ecomatmobile controller
Hydraulic control in PWM
Example Dither
The dither frequency is 1/8 of the PWM frequency.
The dither amplitude is 10 %.
With the switch-on time of 50 % in the figure, the actual switch-on time for 4 pulses is 60 % and for the
next 4 pulses it is 40 % which means an average of 50 % switch-on time. The resulting effective coil
current will be 50 % of the maximum coil current.
The result is that the valve piston always oscillates around its off position to be ready to take a new
position with the next signal change without having to overcome the break-away torque before.
9.3.4
Functions of the library
"ifm_HYDRAULIC_16bitOS05_Vxxyyzz.Lib"
The library
ifm_HYDRAULIC_16bitOS05_Vxxyyzz.Lib
contains the following functions:
•
Function CONTROL_OCC (
→
page
This function uses the function OUTPUT_CURRENT_CONTROL (
→
page
) and the function
OUTPUT_CURRENT (
→
page
) from the library
ifm_CRnnnn_Vxxyyzz.Lib
.
•
Function JOYSTICK_0 (
→
page
•
Function JOYSTICK_1 (
→
page
•
Function JOYSTICK_2 (
→
page
•
Function NORM_HYDRAULIC (
→
* OCC stands for
O
utput
C
urrent
C
ontrol.
The following functions are needed from the library
UTIL.Lib
(in the CoDeSys
®
package):
•
Function
RAMP_INT
•
Function
CHARCURVE
These functions are automatically activated by the functions of
ifm_HYDRAULIC_16bitOS05_Vxxyyzz.Lib
and configured.
The following packages are needed from the library
ifm_CRnnnn_Vxxyyzz.Lib
:
•
Function OUTPUT_CURRENT (
→
page
)
•
Function OUTPUT_CURRENT_CONTROL (
→
page
•
Function OCC_TASK (
→
These functions (
→
chapter PWM signal processing (
→
)) are automatically activated and
configured by the functions of
ifm _HYDRAULIC_16bitOS05_Vxxyyzz.Lib
.
Содержание Ecomat 100 ecomatmobile SmartController CR2500
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