Mitsubishi SCM45ZA User Manual page 24

(l) Compressor lock
If the motor for the compressor does not turn a half a turn approximately 0.3 seconds after it has been started, it is determined
that a compressor lock has occurred and the inverter is stopped.
(m) Compressor dome thermistor broken wire protection control
1) When the outdoor unit speed is other than 0 rps and after the compressor has started to operate, if after 10 minutes there
is a compressor dome thermistor temperature10-second interrupt signal (less than 7 °C), it is immediately placed in
stop mode and restarted. (This detection is only performed once when the compressor is on.)
2) If an error continues for 4 times continuously, a permanent stop is made. (Restoration requires resetting the power
supply.)
(n) Outdoor unit failure
This is a function for determining when there is trouble with the outdoor unit during air conditioning.
The inverter is stopped if any one of the following in item 1), 2) is satisfied. Once the unit is stopped by this function, it is not
restarted.
1) When the input current is measured at 1 A or less for 3 continuous minutes or more.
2) If the outdoor unit sends a 0 rps signal to the indoor unit 3 times or more within 20 minutes of the power being turned on.
(o) Stop mode (Decision speed is 0 rps, when the protection function for the outdoor controller is operating,
when restarting due to operation change)
If stopping due to an indoor unit instruction and if permanent stop.
Functional
Operation
components
Decision
Outdoor unit
rps
speed
0
Outdoor
rps
Actual operating
speed
0
According to
Outdoor unit fan
outdoor rps
0
ON
2 min.
4-way valve
OFF
2 min. 25 sec.
EEV
E EVA
control
200 pulse
Fully
closed
EEV
control
E EVB
Fully
closed
Stop instructions
(10) Regulation of outdoor air flow
(a) The fan operates as follows according to the speed of the outdoor unit. (Except during defrost.)
Outdoor unit speed
Outdoor fan speed
(b) If the outdoor unit fan motor speed is 300 rpm or less for 30 seconds or more continuously, the compressor and outdoor unit
fan are stopped.
214
Cooling
3 min.
3 min.
3 min.
55 sec.
2 min.
2 min. 25 sec.
200 pulse
200 pulse 200 pulse
All stop Stop instructions
Fuzzy auto
Less than 80
when starting
1st speed
2nd speed
Operation of outdoor unit protection function, if restarting
when recovering from thermostat stop and switching operations.
Heating Cooling
3 min.
3 min.
3 min.
2 min.
2 min. 25 sec.
200 pulse
200 pulse
All stop 0 rps instructions
80 or more and
less than 100
3rd speed
Heating
55 sec.
2 min.
2 min. 25 sec.
200 pulse
200 pulse
Restart Stop instructions
100 or more
120 or more
and less than 120
4th speed
5th speed
Restart