12-9
CONTROL SYSTEM
SM YBD018 1-A.1 GB
12.7.6
Heat Sink Over Heating Protection
A new control status will be set according to the following graph every one-minute or
whenever when going up by the rows.
HST
n
is the current reading of HST and HST
n-1
is the last reading of HST.
HST
n
-HST
n-1
HST
n
<-1 -1
0
1
>1
HST
n
>
HSTOH5
SC SC
SC
SC
SC
HSTOH4
HST
n
<
HSTOH5
D1
D1 D2 D2
D2
HSTOH3
HST
n
<
HSTOH4
SR SR
D1
D2
D2
HSTOH2
HST
n
<
HSTOH3
SR SR
SR
D1
D1
HSTOH1
HST
n
<
HSTOH2
Norm Norm
Norm
SR SR
HST
n
<
HSTOH1
Norm
(*) Normal (Norm)
– No protection status is ON.
Stop-Rise (SR)
– System is in protection.
HzDown1 (D1)
- System is in protection.
HzDown2 (D2)
- System is in protection.
12.7.7
System Over Power Protection
Power
n
-Power
n-1
Power
n
<-50 [-50,-1]
0
[1,50] >50
Power
n
> OVRPWR5
SC
SC
SC
SC
SC
OVRPWR4
Power
n
<
OVRPWR5
D1 D1
D2
D2
D2
OVRPWR3
Power
n
<
OVRPWR4
SR SR
D1
D2
D2
OVRPWR2
Power
n
<
OVRPWR3
SR SR
SR
D1
D1
OVRPWR1
Power
n
<
OVRPWR2
Norm Norm
Norm
SR SR
Power
n
< OVRPWR1
Norm
12.7.8
Outdoor Coil Deicing Protection
In the deicing protection, IFAN is forced OFF.
12.7.1.1 Deicing Starting Conditions
Deicing operation will start when either one of the following conditions exist:
