7-27
CONTROL SYSTEM
Revision Y05-01Service Manual - EMD Series
7.2.1.2. Deicing procedure
OCT [
o
c]
ON
OFF
ON
OFF
ON
L
ANY
COMP
OFAN
RV
IFAN
DST
(DDT)
0
12
OFF
HEs are forced ON
DOC
ANY
ON
HE
36s 36s
DT
30s
max 12 min.
Note 3
DI (note 1)
DI (note 2)
30s
3 min 3 min
IFAN
OFF
ANY
HE
OFF
ANY
all SH units
except WAX
RC or WAX units
HEs are forced OFF
IFAN is forced to Low Speed
BLINK
ON
OPER
LED
Notes :
1. In the following Deicing cycles, the time interval between two Deicing cycles activation is between 30 to
80 min
2. For RC group, IFAN is forced off
3. For SH group, HEs are forced ON and IFAN is forced to operate in Low speed, regardless of the ICT and
difference between RAT & SPT.
4. When jumper J7 is set, the DST value is -2°C.
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