nord NORDAC PRO SK 500E Series - P480…P481 Using flags

5 Parameters
BU 0505 EN-3021 135
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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
Determine the trigger
Set Flag 1 to the "Motor overtemperature" function
P481 [-07]

Function "12"
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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P482 [-01]
...
[-10]
Norm. BusIO Out Bits
(Scaling of bus I/O Out bits)
S
-400…400 %
{ all 100 }
Adjustment of the limit values of the relay functions/Bus Out Bits. For a negative value, the output
function will be output negative.
When the limit value is reached and the setting values are positive, the relay contact closes, with
negative setting values the relay contact opens.
The assignment of the arrays correspond to those of parameter (P481).
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P483 [-01]
...
[-10]
Hyst. BusIO Out Bits
(Hysteresis of bus I/O Out bits)
S
1…100 %
{ all 10 }
Difference between switch-on and switch-off point to prevent oscillation of the output signal.
The assignment of the arrays correspond to those of parameter (P481).
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