Inverter Protection Control - Daikin VRV III-S RXYMQ36 48PVJU Service Manual

SiUS34-907
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.
[Inverter overcurrent protection control]
Limited
&
Inverter current ≤ 23.8A
continues for 3 min.
[Inverter fin temperature control]
Limited
&
Function
Not limited
Inverter current >23.8A
INV. upper limit frequency:
1-step down from current
compressor frequency
•10 sec.
•Matching of frequency
Keeping the current step.
INV. upper limit frequency:
1-step up from current
compressor frequency
Inverter current
standby
Not limited
Tfin≥172˚F
INV. upper limit frequency:
1-step down from current
compressor frequency
• 10 sec.
• Matching of frequency
Keeping the current step.
Tfin≤167˚F
continues for 3 min.
INV. upper limit frequency:
1-step up from current
compressor frequency
Fin temp. standby
•Inverter current ≤ 23.8A
&
•INV. upper limit frequency=max. Hz
Inverter current
Without conditions
Inverter current ≥ 24.9A continues for 260 sec.
• When occurring 4 times within 60 min.,
the malfunction code "L8 " is output.
• Tfin<167˚F
&
• INV. upper limit frequency=max. Hz
Tfin≥172˚F
Without conditions
Tfin≥181˚F
Protection Control
>23.8A
• When occurring 4 times within 60 min.,
the malfunction code "L4" is output.
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