172
ifm
System Manual
ecomat
mobile
SmartController (CR2500, CR2502) V05
PWM in the ecomatmobile controller
Current control with PWM
9.2
Current control with PWM
This device of the
ecomat
mobile
controller family can measure the actually flowing current on certain
outputs and use the signal for further processing. For this purpose
ifm electronic
provides the user
with some functions.
9.2.1
Current measurement with PWM channels
Current measurement of the coil current can be carried out via the current measurement channels
integrated in the
ecomat
mobile
controller. This allows for example that the current can be re-adjusted
if the coil heats up. Thus the hydraulic conditions in the system remain the same.
NOTICE
Overload protection with ClassicConroller and ExtendedController:
In principle, the current-controlled outputs are protected against short circuit. In the event of overload, in
which the currents are limited by cable lengths and cross sections to for example between 8 A and
20 A, the measuring resistors (shunts) are thermally overloaded.
►
Since the maximum permissible current cannot always be preset, the operating mode
OUT_OVERLOAD_PROTECTION should always be selected for the outputs in the application
program. With currents > 4.1 A the respective output is switched off automatically.
> If the output is no longer overloaded, the output is automatically switched on again.
The function OUT_OVERLOAD_PROTECTION is not active in the PWM mode (without current
control)!
NOTE
The following applies to ClassicController and ExtendedController:
The current-control function OCC_TASK (
→
) and function OUTPUT_CURRENT_CONTROL
(
→
page
) are based on the function PWM (
→
). If the current control functions are used,
only the PWM function may be used for channels 8...11. The RELOAD value corresponding to the
frequency must be calculated.
Содержание Ecomat 100 ecomatmobile SmartController CR2500
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