Sharp AE-X4M30PU, Service Manual

Page: 25 / 42

AE-X4M30PU
25
PROTECTIVE FUNCTIONS AND OPERATIONS
NO. Function
Operation
Description Detection time Restart condition
1 DC over current
Compressor is stopped if a current approxi-
mately 25A or more flows in the power transistor
module.
During compressor
operation Automatically restarts after
safety time (180 seconds)
4 times Yes Yes
2 AC over current
Lowers the operating frequency if the compres-
sor AC current exceeds set value(19.3). Stops
the compressor if the current exceeds at mini-
mum frequency.
During compressor
operation Automatically restarts after
safety time (180 seconds)
4 times Yes Yes
3
Compressor over-
heat prevention
control
Lowers the operating frequency if the tempera-
ture of the compressor thermistor (TH1) rises
above 226.4°F (108°C). Compressor is stopped
if the thermistor stays above 226.4°F (108°C) for
2 minutes at minimum frequency.
During compressor
operation Automatically restarts after
safety time (180 seconds)
No limit No No
4
Compressor high
temperature error
Compressor is stopped if the compressor ther-
mistor is above 235.4°F (113°C) (Or when TH1
shorts)
During compressor
operation
Automatically restarts when
thermistor (TH1) temperature
f a l l s b e l o w 2 1 0 . 2 ° F ( 9 9 ° C )
(approximately 30 minutes)
4 times Yes Yes
5
Outdoor heat
exchanger over-
heat prevention
control
Lowers the operating frequency if the tempera-
ture of the outdoor heat exchanger rises above
134.6°F(57°C) during cooling. Stops the com-
pressor if the temperature stays above 134.6°F
(57°C) for 2 minutes at minimum frequency
During compressor
operation Automatically restarts after
safety time (180 seconds)
No limit No No
6 Thermistor short
Compressor is stopped, if heat exchanger or
outdoor thermistor shorts. Close the expansion
valve of the corresponding room, if some suction
thermistor shorts. When the room is
activated turns ON
and the compres-
sor starts.
Operation OFF 1 time Yes Yes
7 Thermistor open
Compressor is stopped, if compressor or heat
exchanger or outdoor thermistor opens.
Close the expansion valve of the corresponding
room, if some suction thermistor shorts or opens.
When the room
turns ON and the
compressor starts.
Operation OFF 1 time Yes Yes
8
AC abnormal cur-
rent
Compressor is stopped, if the operating frequen-
cy is above 70Hz and the compressor current is
below 0.8A.
During compressor
operation Automatically re-starts after
safety time.(180 sec.)
4 times Yes Yes
9 Serial signal error
INDOOR
If open, while timer LED blinks, operation is con-
tinued. If short, operation is continued.
OUTDOOR
Loses the expansion valve of the corresponding
room if the outdoor unit does not receive a serial
signal from one or more indoor unit for 30 sec-
onds.
Compressor is stopped, if the out-door unit does
not receive a serial signal from all indoor units.
During operation
Automatically re-starts as soon
as the serial communication
becomes possible.
No limit Yes Yes
10
Miswiring check
error Compressor is stopped, and miswiring check
operation ends. During miswiring
operation Miswiring check operation will
not re-start automatically.
4 times Yes Yes
11
Indoor heat
exchanger over-
heat prevention
control
Lowers the operating frequency if the tempera-
ture of any of indoor heat exchanger rises high
temperature during heating.
Stops the compressor if the temperatures rays
high for 2 minutes at minimum frequency.
During compressor
operation Automatically re-starts after
safety time.(180 sec.)
No limit No No
12
Power factor mod-
ule error When a power factor module error input is
detected. During compressor
operation Automatically re-starts after
safety time.(180 sec.)
4 times Yes Yes
13
DC Compressor
rotation error In the case that the feed back signal from the
compressor is not input or abnormal. During compressor
operation Automatically re-starts after
safety time.(180 sec.)
8 times Yes Yes
14
IPM overheat pre-
vention control.
IPM high tempera-
ture error
Lowers the operating frequency if the tempera-
ture of IPM rises high temperature.
Stops the compressor if the temperatures rays
high for 2 minutes at minimum frequency.
During compressor
operation Automatically restarts after
safety time.(180 sec.)
No limit No No