Specifications

Protection Control Si38-304
108 Function
4.4 Inverter Protection Control
Inverter current protection control and inverter fin temperature control are performed to prevent
tripping due to a malfunction, or transient inverter overcurrent, and fin temperature increase.
+ In the case of multi-outdoor-unit system, each INV compressor performs these controls in
the following sequence.
[Inverter overcurrent protection control]
[Inverter fin temperature control]
Not limited
Under inverter current
protection control
Inverter current >Ia
Inverter current standby
Inverter current <Ia
INV upper limit frequency = 210 Hz
INV upper limit frequency: 1-step down
from current compressor frequency
INV upper limit frequency: 1-step up from
current compressor frequency
Inverter current >Ia
Inverter current<Ia continues
for 3 min. or more.
Inverter current > Ib continues for 260 sec.
Inverter current > Ic continues for 5 sec.
&
or
200-V unit 400-V unit
Ia
Ib
Ic
25 A 13.5 A
26.1 A
31 A 16.5 A
• When occurring 3 times within 60 min.,
the malfunction code “L8 ” is output.
• When occurring 3 times within 30 min.,
the malfunction code “L9” is output
Not limited
Tfin>84˚C
Fin temp. standby
Tfin<81˚C
INV upper limit frequency = 210 Hz
Under fin temperature
protection control
INV upper limit frequency: 1-step /
1 min down from current compressor
frequency
INV upper limit frequency: 1-step / 1 min
up from current compressor frequency
Interval
Inverter current<81˚C continues
for 3 min. or more.
&
Tfin>84˚C
Tfin>89˚C
• When occurring 3 times within 60 min.,
the malfunction code “L4” is output.
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