User manual

TVS user manual Programming the parameters
33
Programming variable stages, parameters 2 to 9
Stages 1 and 2 are variable stages. There are four settings to program for each variable stage. The
following diagram explains how the settings work together. For a more-detailed description of how
all settings work together, read Understanding how the TVS operates on page 30.
 When the temperature is below the idle range, the fan is off.
 When the temperature reaches the idle range, the fan runs at the idle speed. The fan continues to
run at the idle speed until the temperature rises to the set point.
 When the temperature is between the set point and differential, fan speed increases or decreases
proportionally with the temperature.
 When the temperature is at or above the differential, the fan runs at full speed.
Use the
Variable and relay stages settings worksheet on page 58 when
programming variable stages.
0% 100%
3
4
5
2
Temperature
Fan speed
Fan speed increases as the temperature rises, or decreases
as the temperature falls.
The fan runs at
idle speed. The temperature band between
t
he idle range temperature and the set point is sometimes
called the ‘idle band’.
The fan is off when the temperature is below the
idle range
t
emperature.
The fan runs at full speed.
Differential
temperature
Idle range
temperature
Idle speed
Set point
temperature