Mitsubishi Heavy Industries FDCW100VNX, Technical Manual

Page: 101 / 173

Service
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speed (frequency) is controlled in order to protect the inverter.
B
A
Reduce compressor speed
at every 1minute
Reset
Current (A)
Retention
12
14
16
18
20
22
24
50 40 60 70 80 90 100 110 120 130
Control or re
s
et valve (A)
Compre ss or s peed (frequency) (rp s )
(Fig. C) The control value “A” and the reset value vary depending
on the compressor speed.
Reset valve B
Control valve A
Cooling Heating
Control Value
A
Reset value
B
Control Value
A
Reset value
B
Secondary
current side
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8) Power transistor temperature control
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77
80
Reduce compressor speed
at every 1minute
Reset
Power transistor temperature (°C)
Retention
9) Anomalous power transistor current
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overcurrent of inverter.
b) When the current value of power transistor exceeds the specified value and compressor stops 4 times within 30
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10) Anomalous inverter PCB
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11) Anti-freeze control by the compressor frequency control
It depends on the command from indoor unit
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Under the control of compressor protection start Ⅲ
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continuously.
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Operation control function by the outdoor unit controller