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CASE 2 Unit with Low / High Speed control or PWM
The Ventilation Factor “V.F.” is calculated using the High Pressure measured using the HP sensor and the
rate at which it is moving away or towards the High Pressure Set Point (3611). It also includes a dead zone
of 5 bars and a sampling time constant of 15 seconds.
If menu set point 3611 is set to 15 bars
# Pressure > 17 bars ! V.F. increasing
# 12 bars < Pressure < 17 bars ! V.F. unchanged
# Pressure < 12 bars ! V.F. decreasing
Ventilation Factor “V.F.” can be seen in menu 2222 to 2225 on the DS50
For example on a unit with 3 Fans
The “PWM factor” which is used to adjust the speed of the fan when it is running in PWM
This PWM Factor “PWM.F” is calculated using the High Pressure measured using the HP sensor and the
rate at which it is moving away or towards the High Pressure Set Point (3611). The sampling time constant is
5 seconds.
If menu set point 3611 is set to 15 bars
# Pressure > 15 bars ! PWM.F. increasing
# 14 bars < Pressure < 15 bars ! PWM.F. unchanged
# Pressure < 14 bars ! PWM.F. decreasing
Value for PWM.F can be seen on menu 2619, 2629, 2639 and 2649 on a DS50
Note
: Moreover, the fan control anticipates the power factory of the fan. In other words, when a compressor
is switched on, the power factory is calculated in according to 3xT° Outside.
(T° Outside = Outside Temperature)
For example, if T°Outside = 20°C, then FP Fan = 3x20=60%
0%
100%
PWM Facto
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