NORD Drivesystems BU0180 - Manual (Page 94)

SK 180E Manual for frequency inverters
94 Pre-series version BU 0180 GB-0914
Parameter
{Factory setting}
Setting value / Description / Note Device Supervisor
Parameter
set
1 = 0 – 10 V: If a setpoint smaller than the programmed adjustment 0% (P402) is present,
this may cause a change in the direction of rotation. This allows rotation direction reversal
using a simple voltage source and potentiometer.
E.g. internal setpoint with reversal of direction of rotation: P402 = 5V, P104 = 0 Hz,
Potentiometer 0
–10 V  Rotation direction change at 5V 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
As soon as the setpoint is greater than
[P402 - (10% * (P403 - P402))] it
delivers an output signal again.
f / Hz
P104
(fmin)
P105
(fmax)
P
4
0
3
=
1
0
.0
V
P
4
0
2
=
2
.0
V
= 8.0V
U/V
O
F
F
=
2
.0
V
-
1
0
%
*
8
.0
V
=
1
.2
V
E.g. setpoint 4-20 mA:: P402: Adjustment 0% = 1V; P403: Adjustment 100% = 5 V; -
10% corresponds to -0.4 V; i.e. 1...5 V (4...20 mA) normal operating zone, 0.6...1 V =
minimum frequency setpoint, below 0.6 V (2.4 mA) output switches off.
NOTE:
The SK xU4- IOE provides the frequency inverter with a value standardised to 0…100%.
In addition, the frequency inverter also receives a bit, which confirms that the analog
input signal is within the defined limits.
Example: Setpoint: 4 … 20 mA
0…4 mA = 0% (0000
hex
)
20 mA = 100% (4000
hex
)
≥ 2 mA = Bit "Setpoint value valid"
If the "0-10 V monitored" mode is selected, the bit "Setpoint value valid" is evaluated and
if the setpoint value is undershot by a value of 2mA, the inverter output is switched off.
NOTE:
Settings of parameters (P402) and (P403) are treated in an additive manner, i.e. they
can be used for additional adjustment of the limiting values.
3 = - 10V – 10 V: If a setpoint smaller than the programmed adjustment 0% (P402) is
present, this may cause a change in the direction of rotation. This allows reversal of the
direction of rotation using a simple voltage source and potentiometer.
E.g. internal setpoint with reversal of direction of rotation: P402 = 5 V, P104 = 0 Hz,
Potentiometer 0
–10 V  Rotation direction change at 5V in mid-range setting of the
potentiometer.