NORD Drivesystems BU0200 - Manual (Page 197)

SK 200E Manual for frequency inverters
196 Subject to technical alterations BU 0200 GB-4411
Parameter
{Factory setting}
Setting value / Description / Note Device Supervisor
Parameter
set
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 value: 4 … 20 mA
0…4mA = 0% (0000
hex
)
20mA = 100% (4000
hex
)
≥ 2mA = Bit "Setpoint value valid"
If the "0-10V 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 – 10V: If there is a setpoint value which is smaller than the programmed
adjustment 0% (P402), this may result in a change in the direction of rotation. Because
of this, a reversal of the direction of rotation may be implemented with a simple voltage
source and a potentiometer.
e.g. internal setpoint with change of direction of rotation: P402 = 5V, P104 = 0Hz,
potentiometer 0
–10V  change of direction of rotation at 5V in the middle setting of the
potentiometer.
At the moment of reversal (Hysteresis =

P505), the drive unit is at a standstill, if the
minimum frequency (P104) is less than the absolute minimum frequency (P505). A
brake controlled by the FI is not applied within the hysteresis range.
If the minimum frequency (P104) is larger than the absolute minimum frequency
(P505), the drive reverses when the minimum frequency is reached. Within the
hysteresis range

P104 provides the FI with the minimum frequency (P104), a brake
controlled by the FI is not applied.
NOTE: The function -10V – 10V is a description of the method of function
and not a reference to a bipolar signal (see example above).
4 = 0 – 10V with error 1, "0 – 10V with switch-off on error 1“:
If the 0% adjustment value in (P402) is undershot, the error message 12.8 "Analog In
Min. undershot" is activated.
Overshooting of the 100% adjustment value in (P403) activates the error message 12.9
"Analog In Max. overshot".
Even if the analog value is within the limits defined in (P402) and (P403), the setpoint
value is limited to 0 - 100%.
The monitoring function only becomes active if there is an enable signal and the analog
value has reached the valid range (≥(P402) or ≤(P403)) for the first time (E.g. Build-up
of pressure after switching on a pump).
5 = 0 – 10V with error 2, "0 – 10V with switch-off on error 2“:
See Setting 4 ("0 - 10V with switch-off on error 1“), however:
With this setting, the monitoring function is active if there is an enable signal and
suppression time for the error monitoring has expired. This suppression time is set in
parameter (P216).