Phason Three Ventilation Stage Control, Руководство пользователя

Страница: 31 / 52

Phason TVS user manual
Power factor correction
Adjusting the P-Band to correct for a particular power factor may improve your ventilation system's
performance. Power factor correction is generally unnecessary and there is no danger of damage being
done to the control or motor if it is not done. As a result of different power factors between the many
makes and models of fan motors, the actual P-Band may be less then the P-Band setting displayed by the
control.
If the power factor of the motor is available, use the chart of correction numbers (listed in table 4 below)
and CALC 1 below to calculate the P-Band setting required in order to get the desired P-Band. A power
factor of 0.8 or greater will cause an insignificant change to the P-Band and does not need to be corrected.
POWER
FACTOR
CORRECTION
NUMBERS
1.0 1.00
0.9 1.05
0.8 1.10
0.7 1.25
0.6 1.33
0.5 1.60
Table 4 : Power Factor Correction Numbers
CALC 1: P-BAND SETTING = DESIRED P-BAND x CORRECTION NUMBER
Example 1: To have a 6
o
F P-Band with a motor which has a power factor of 0.7, set the P-Band to 7.5
o
F
(ie. 6
o
F x 1.25 = 7.5
o
F).
10245506 25