NORD Drivesystems BU0500 - Manual (Page 93)

5 Parameters
BU 0500 GB-1013 93
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 parameters P420 … P425. 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
Mode analog in. 1
(Analog input 1 mode)
S
0 ... 5
{ 0 }
This parameter determines how the FI reacts to an analog signal which is less than the 0 %
adjustment (P402).
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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.
2 = 0 – 10V monitored: If the
minimum adjusted setpoint
(P402) is undershot by 10% of the
difference value from P403 and
P402, the FI output switches off.
Once the setpoint is greater than
[P402 - (10% * (P403 - P402))], it
will deliver an output signal again.
f / Hz
P104
(fmin)
P105
(fmax)
P
403
=
10.
0V
P
402
=
2.
0V
= 8.0V
U/V
O
F
F
=
2.
0V
-
10%
*
8.
0V
=
1.
2V