Danfoss AK2-SC 255, Reference Manual, Page: 45 / 206

44 AK2-SC 255 Reference Manual RS.8D.M1.22
Neutral Zone: Danfoss Neutral Zone control will be
used. This is a strategy that operates to move current
value closer to target more rapidly the farther away the
current value is from target. If you select Neutral
Zone here, you will cause answer on inverter control
on the second page following to change to None. That
will in turn lock this selection to one between Rate of
change and Neutral Zone, since those strategies
apply to installations without variable speed fans. If you
change equipment strategies, or select Neutral Zone
in error, first select Rate of Change here, then go to
the second page following and change Fan inverter
control to the appropriate variable speed control,
either VO or VLT, to restore the variable speed
choices here.
Rate of change: A control strategy that simulates
PID control.
Ramp stages if ambient (-99.0 to 150.0, +/- 0.0 to 9.9) If the ambient tempera-
ture is below setpoint minus range, ramping will be by
stages. When ambient reaches setpoint plus range, all
fans will ramp together.
Target (0.0 to 500.0 for pressure sensors; 0.0 to 200.0 for
temperature sensors) The value that the control
algorithm will seek to maintain with the selected
strategy.
Pump, louver, and
sump settings
The next page has settings for pump, louver, and sump control:
Pump cutin (0.0 to 500.0) The pressure at which the pump will be
turned on.
Pump cutout (0.0 to 500.0) The pressure at which the pump will be
turned off.