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POS-123-P-PFN
5.6.8
IMS (Theoretical maximum current drain)
In order to offer a safe protection against overheating of the coil in case of a hardware failure, the use of an
up-stream electronic overload protection may be required.
Further information about this topic can be taken from the document AN-
102: „proportional magnet coils in
Ex-
protection areas”.
With the parameter IMS it is possible to limit the current drain of the power amplifier in a way that even under
adverse conditions the overload protection will not trigger if there is no hardware fault. The function does not
delimit the dynamics of the system and the full solenoid current is preserved as long as possible. The limiting
function calculates the current drain by considering the solenoid current and the duty cycle of the PWM signal.
Therefore its precision is affected by the PWM frequency, but it is always sufficient in order to avoid triggering
the protection switch.
Preset value of the parameter is 2600 mA and this means it is inactive. Activation of the function is achieved
by setting IMS < CURRENT. The rated current of the protection switch should be entered.
Command
Parameter
Unit
Group
IMS
x
x= 500 … 2600
mA
POWERSTAGE
5.7 Special commands
5.7.1
AINMODE
Command
Parameter
Unit
Group
AINMODE
x
x= EASY|MATH
-
TERMINAL
This command is used to switch over the kind of input scaling.
The AINMODE is used to define the kind of parameterising of the analogue inputs. The EASY mode
(DEFAULT) supports a simple and application-oriented input scaling.
The MATH mode supports the free input scaling by a linear equation. This mode is compatible to our older
modules.
Attention: This command can be executed in the terminal window only. In case of switching back,
DEFAULT data should be reloaded.
Содержание POS-123-P-PFN
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