Application Guide

63-706233
VFD Features Used
— Power failure recover.
— Speed search.
— Possible DC injection on start.
— Overspeed capability for increased performance.
IMPORTANT
Ensure minimum number of air charges per hour is still met, by using VFD low limit.
Operation
Control
Output
100
Min Fan
Speed
Min OA
Damper
ZEBZEB
Setpoint
Temperature t
t
OA
<
t
t
OA
>
t
Legend
Temperature Control
Fan Speed Control
Dampers
Fan Speed
Heating Cooling
OA
Damper
Fig. 38 Sequence of Control: Temperature.
Control
Output
100
Min Fan
Speed
Min OA
Damper
Setpoint
Dampers Inverter
CO - Concentration
2
Fig. 39 Sequence of Control: Air Quality.