5 Parameter
BU 0200 en-3118 185
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P480 … P481 Using flags
With the aid of the two flags it is possible to define simple, logical sequences of functions.
To do this, the "triggers" for a function (e.g. a motor PTC overtemperature warning) are defined in
parameter (P481) in arrays [-07] - "Flag 1" or [-08] - "Flag 2"
As well as this, the function which the frequency inverter is to execute when the "trigger" is active
- i.e. the response by the frequency inverter is defined in parameter (P480) in arrays [-09] or [-10].
Example:
In an application, if the temperature of the motor reaches the overtemperature range
("Overtemperature motor PTC") the frequency
inverter is to immediately reduce the speed to a
specific speed (e.g. by means of an active fixed frequency). This is to be implemented by
"Deactivation of analog input 1" via which in this example, the actual setpoint is normally set.
This is used to redu
ce the load on the motor, so that the temperature can stabilise or the drive
unit reduces speed to a defined value before a shut-down due to error is made.
Step Description Function
1
Set Flag 1 to the "Motor overtemperature" function
2
Specify the reaction,
Set Flag 1 to the function "Setpoint 1 On/Off
P480 [-09] Function "19"
It should be noted that depending on the function which is selected in (P481) the function may
need to be inverted by modification of the standardisation (P482).
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