NORD Drivesystems BU0505 - Manual (Page 100)

SK 54xE – Users Manual for Frequency Inverters
100 BU 0505 GB-1013
List of possible digital functions of the analog inputs
The analog inputs of the FI can also be parameterised to process digital signals. The digital functions
are set in parameter P420 [-08] or [-09].
If a digital function is assigned to an analog input, the analog function of the relevant input must be set
to {0} "Off" in order to prevent misinterpretation of the signals.
A detailed description of the digital functions can be found after parameter P420. The functions of the
digital inputs are identical to the digital functions of the analog inputs.
Permissible voltage when using digital functions: 7.5...30 V.
NOTE:
The analog inputs with digital functions do not comply with EN61131-2 (Type 1 digital inputs), because
the idling currents are too low.
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Parameter
{factory setting}
Setting value / Description / Note Supervisor
Parameter
set
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P401 [-01]
...
[-06]
Analog input mode
(Mode analog input)
0 ... 5
{ all 0 }
This parameter determines how the frequency inverter reacts to an analog signal which is less
than the 0% adjustment (P402).
[-01] = Analog input 1: analog input 1, integrated into the FI
[-02] = Analog input 2: analog input 2, integrated into the FI
[-03] = External analog input 1, "External analog input 1": Analog input 1 of the first IO
extension
[-04] = External analog input 2, "External analog input 2": Analog input 2 of the first IO
extension
[-05] = External Analog input 1, 2nd IOE, "External analog input 1 of the 2nd IOE": Analog
input 1 of the second IO extension
[-06] = External Analog input 2, 2nd IOE, "External analog input 2 of the 2nd IOE": Analog
input 2 of the second IO extension
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0 = 0 – 10V limited: An analog setpoint smaller than the programmed adjustment 0% (P402)
does not lead to undershooting of the programmed minimum frequency (P104).
1 = 0 - 10V: If a setpoint smaller than the programmed adjustment 0% (P402) is present, this
can cause a change in direction rotation. This allows rotation direction reversal using a
simple voltage source and potentiometer.
E.g. internal setpoint with rotation direction change: P402 = 5 V, P104 = 0 Hz,
Potentiometer 0-10 V
à Rotation direction change at 5 V in mid-range setting of the
potentiometer.
At the moment of reversal (hysteresis =
± P505), the drive stands still when the minimum
frequency (P104) is smaller than the absolute minimum frequency (P505). A brake that is
controlled by the FI will have entered the hysteresis range.
If the minimum frequency (P104) is greater than the absolute minimum frequency (P505),
the drive reverses when the minimum frequency is reached. In the hysteresis range
±
P104, the FI supplies the minimum frequency (P104), the brake controlled by the FI is not
applied.