Rockwell Automation FANM FanMaster Energy Saving Package - Manual (Page 55)

FanMaster Configuration and Start Up 3-19
Allen-Bradley® FanMaster™ Energy Saving Package Installation Manual - Publication FANM-IN001B-EN-P – December, 2009 PN-65329
Note: When in cooling mode, the supply fan speed will typically be set
based on the difference in temperature (Delta-T) between the mixed air and
supply air (as illustrated, using default values, in
Figure 3.1 and Figure 3.2
below) unless the supply air temperature exceeds the low limit override (is
less than the default value of 45° F). If the supply air temperature exceeds
the low limit override value, the fan speed will increase to the VFD output
maximum value (for cooling setup).
Figure 3.1 Example Two-State Cooling Setup
Figure 3.2 Example Proportional Cooling Setup
Delta-T
F
an Speed (%)
Two-State Cooling Setup
Delta-T
Min
Delta-T
Max
VFD
Output
Min
VFD
Output
Max
(Mixed Air - Supply Air Temp.)
10 20 30 40 50
100
75
50
25
0
Proportional Cooling
10 20 30 40 50
100
75
50
25
Delta-T
Min
Delta-T
Max
VFD
Output
Min
VFD
Output
Max
F
a
n Speed (%)
Delta-T
(Mixed Air - Supply Air Temp.)
0