When the FI has been enabled (for either a positive or a negative phase sequence), the fixed fre-
quency is activated via a digital input and subsequently used as the setpoint.
A negative setting value will produce a phase sequence reversal (as related to the phase sequence at
enable P420 to P425, P470).
When several fixed frequencies are activated at the same time, the individual values are added taking
their signs into account. The same will happen if a fixed frequency is combined with the start-off fre-
quency (P113), the analogue setpoint (provided that P400 = 1) , or the minimum frequency (P104).
The system ensures that the frequency will never decrease below or exceed the limits defined (P104 =
f
min
, P105 = f
max
).
If none of the digital inputs is programmed to enable the FI (for a positive or negative phase
sequence). Applying a fixed frequency signal will be sufficient to achieve this effect. When a
positive fixed frequency is applied, the inverter is enabled for a positive phase sequence,
whereas when a negative value is used, it is enabled for a negative phase sequence.
To Next Page
Loading...
