Airwell ONG3-17 R410A, Service Manual

Page: 60 / 127

CONTROL SYSTEM
Service Manual-CN Fixed RPM series
A. DEICER ACTIVATION ALGORITHM
Notes:
1. Count LDT while Deicing
2. In first COMP activation (after SB or OFF),
2.1. For WSHP: if OCT < 5
o
c, DI = 10 min, else DI = 20 min
2.2. For all other: if OCT < 0
o
c, DI = 10 min, else DI = 40 min.
COMP to ON
For WSHP
DI = 20 (or 10)
DT = 1
All others:
DI = 40 (or 10)
DT = 5
Activate DDt setting
Routine
Start counting TLD
DTF = 0
OCT < DOC ?
DTF=1
&
OCT < DDT
(during last 3 minutes)
&
ICT < 40 deg
Deicer activation
(see Notes)
TLD > DI
&
OCT < DST
(during last 3 minutes)
Deicer activation;
TLD=DI;
(see Notes)
LDT > DT + TimeD
LDT < DT-TimeD
or
LDT < DTmin
DI = TLD - DIT DI = TLD + DIT
If (TLD>DI) then
TLD=DI;
DI = TLD;
Yes
Yes
DI < DImin
DI > DImax
DI = DImax
DI = DImin
DT = LDT
1
1
No
No
No
Yes
Yes Yes
No No
Yes
Yes
No
No
DDT and DTF information from Deicing
Dynamic Threshold setting routine