Inverter Protection Control - Daikin R-410A Service Manual

Protection Control
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]
Inverter current > 23.8A
Limited
• 10 sec.
&
• Matching of frequency
Inverter current ≤ 23.8A
continues for 3 min.
[Inverter fin temperature control]
Tfin≥93°C
Limited
• 10 sec.
&
• Matching of frequency
Tfin≤90°C
continues for 3 min.
54
Not limited
• Inverter current ≤ 23.8A
&
• INV upper limit frequency
INV upper limit frequency:
1-step down from current
compressor frequency
Status quo
INV upper limit frequency:
1-step up from current
compressor frequency
Inverter current ≥ 24.9A
Inverter current
standby
Not limited
• Tfin < 90°C
&
• INV upper limit frequency
INV upper limit frequency:
1-step down from current
compressor frequency
Tfin≥93°C
Status quo
INV upper limit frequency:
1-step up from current
compressor frequency
Tfin≥99°C
Fin temp. standby
Inverter current > 23.8A
Without conditions
• 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.
Without conditions
• When occurring 3 times within 60 min.,
the malfunction code "L4" is output.
SiBE39-402A
(V3178)
(V3179)
Function