Nord Drivesystems NORDAC FLEX SK 200E Series User Manual page 169

3 =- 10V – 10V: If a setpoint less than the programmed 0% adjustment (P402) is present, this can
4 = 0 – 10V with error 1, "0 – 10 V with error switch-off 1":
5 = 0 – 10V with error 2, "0 – 10 V with error switch-off 2":
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cause a change in rotation direction. 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  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 less than the absolute minimum frequency (P505). A brake controlled by
the VFD is not applied in 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 VFD supplies the minimum frequency (P104), the brake controlled by the VFD is
not applied.
NOTE:
The function -10 V – 10 V is a description of the function and not a reference to
a bipolar signal (see example above).
If the value of the 0% adjustment in (P402) is undershot, error message 12.8
"Undershooting of Analog In Min." is activated.
If the value of the 100% adjustment in (P402) is undershot, error message 12.9 "Undershoot
of Analog In Max." is activated.
Even if the analog value is outside the limits defined in (P402) and (P403), the setpoint is
limited to 0% - 100%.
The monitoring function only becomes active if an enable signal is present and the analog
value has reached the valid range (≥(P402) or ≤(P403)) for the first time (e.g. pressure
buildup after switching on a pump).
Once the function has been activated, it also operates if the actuation takes place via a field
bus, for example, and the analog input is not actuated at all.
See setting 4 ("0 - 10 V with error switch off 1") but:
In this setting the monitoring function only becomes active if an enable signal is present and
the time during which the error monitoring is suppressed has elapsed. This suppression time
is set in parameter (P216).
5 Parameter
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