Mitsubishi Heavy Industries SRK100VNXWZRF Service Manual page 25

(f) Over-current protection current safe controls I, II
Detecting the outdoor inverter input (primary) current and the output (secondary) current, if the current values exceed
setting values, the compressor speed is controlled to protect the inverter.
Retention
Reset
B
Current (A)
(Fig. C) The control value "A" and the reset value vary depending
on the compressor speed.
24
22
20
18
16
Reset valve B
14
12
40 50 60 70
Compressor speed (rps)
(g) Power transistor temperature protection
(i) Protective control
If the power transistor temperature (detected with TIP) exceeds the setting value, the compressor speed is controlled
to suppress the rise of power transistor temperature.
(h) Anomalous power transistor current
(i) Prevents over-current on the inverter. If the current value in the power transistor exceeds the setting value, the
compressor stops.
(ii) If the current value in the power transistor exceeds the specified value and the compressor stops 4 times within 30
minutes, E42 is displayed on the remote control and it enters the anomalous stop mode.
( i ) Anomalous inverter PCB
If the power transistor detects any anomaly for 15 minutes, including the stop of compressor, E51 is displayed on the
remote control and it enters the anomalous stop mode.
( j ) Anti-frost control by the compressor speed control
(i) If the indoor heat exchanger temperature (detected with Th2) exceeds the setting value at 4 minutes after the start of
compressor, the compressor speed is controlled to initiate the anti-frost control of indoor heat exchanger.
(ii) When there are 2 indoor heat exchanger temperatures (Th2), the lower temperature is detected.
(iii) Regarding the anti-frost control by the operation stop, refer to the operation control function by the indoor control
and the cooling, dehumidifying frost prevention of page 15.
Reduces compressor speed
at each minute.
A
Note (1) Value in ( ) are for the single phase models.
Control valve A
80 90 100 110 120 130
Retention
Reset
76(70)
Power transistor temperature (°C)
Note Value in ( ) are for the single phase model.
Retention
Reduces compressor speed
at each minute.
A
Indoor heat exchanger temperature (°C)
24
-
Model
Control
value A
Primary
current FDC100 11.0 (23.0) 10.0 (22.0) 11.0 (23.0) 10.0 (22.0)
side
Secandary
current FDC100 11.5 (Fig.C) 10.5 (Fig.C-1) 11.5 (Fig.C) 10.5 (Fig.C-1)
side
Reduces compressor speed
at each minute.
80(73)
Reset
B
-
'22 • PAC-SM-422
Cooling Heating
Reset Control
value B value A value B
A
Relative humidity
-0.5 1.0
50% or lower
Relative humidity
1.0
50% over
Reset
B
2.5