Function And Operation Of Protective Procedures - Sharp AH-X127E Service Manual

AH-X127E
AU-X127E
AY-X127E
AE-X127E

FUNCTION AND OPERATION OF PROTECTIVE PROCEDURES

Function
NO
1 Indoor fan Stops operation if no revolution pulse
lock signal is input from the indoor fan motor for
one minute.
Indoor fan Stops operation if the revolution pulse
rpm error signal from the indoor fan indicates low
rpm (approximately 300 rpm or less).
2 Indoor Lowers the operating frequency if the
freezing temperature of the indoor heat exchanger
guard goes below 5°C during cooling. Stops the
compressor if the temperature stays below
0°C for 4 minutes.
3 Indoor Lowers the operating frequency if the
overheating temperature of the indoor heat exchanger
control rises above the overheating temperature
during heating. Stops the compressor if the
temperature stays above the overheating
temperature for 1 minute at minimum
frequency.
Set values for overheating temperature
During normal operation: 51°C to 54°C
During full power operation: 54°C to
58°C
4 DC Stops the compressor if a current of
overcurrent approximately 30 A or more flows in the
or overheat of power transistor module. Also stops the
the IPM compressor if the temperature of the
power transistor module is exceeds 105°C.
5 Lowers the operating frequency if the
compressor AC current exceeds
AC Peak control level
overcurrent [11.3A(heating), 10.4A(cooling)]
Stops the compressor if the current
exceeds peak control level at 40 Hz or less.
Stops the compressor if the compressor
AC current exceeds 15 A.
6 Stops the compressor if the compressor
AC current exceeds 4.25 A immediately
Compressor after activating the compressor (at 17 to 30
lock Hz).
Operation
Description
When indoor
fan is revolving
During cooling
and dry
During heating
During
compressor
operation
During
compressor
operation
Immediately
after
compressor
activation.
26
Detection Restart
time condition
Operation OFF
Automatically
restarts when the
exchange
temperature rises
above the freezing
prevention
temperature (above
2°C)
Automatically
restarts when the
exchange
temperature goes
below the
overheating
temperature.
Automatically
restarts after safety
time (170 seconds)
Automatically
restarts after safety
time (170 seconds)
Automatically
restarts after safety
time (170 seconds)
Self diagnostic
display
Restart Indoor Outdoor
times
No limit Yes No
No limit No No
No limit No No
4 times Yes Yes
4 times Yes Yes
4 times Yes Yes