J Codes (Application Functions 1) - Fuji Electric FRENIC-HVAC User Manual

6.3.7

J codes (Application functions 1)

J21 Dew Condensation Prevention (Duty)
When the inverter is stopped, dew condensation on the motor can be prevented, by feeding
DC power to the motor at regular intervals to keep the temperature of the motor above a
certain level.
Enabling Dew Condensation Prevention

To utilize this feature, you need to assign the terminal command DWP ("Protect motor from
dew condensation") to one of the general-purpose digital input terminals.
( E01 to E07, data = 39)
Dew Condensation Prevention (Duty) (J21)

The magnitude of the DC power applied to the motor is the same as the setting of F21 (DC
braking 1, Braking level) and its duration of each interval is the same as the setting of F22
(DC braking 1, Braking time). Interval T is determined so that the ratio of the duration of the
DC power to T is the value (Duty) set for J21.
J22 Commercial Power Switching Sequence
Refer to the description of ISW50 and ISW60 (Enable integrated sequence to switch to
commercial power) in E01 through E07.
Duty for condensati on prevention
Condensation Prevention Cycle
6-181
6.3 Details of Function Codes
F22
(J21) = × 100 (%)
T
(Refer to E01 through E07.)