Inverter Protection Control - Daikin FCQ18PVJU Service Manual

SiUS28-902_a
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 >XA
Limited
•10 sec.
OR &
•Matching of frequency
•15 sec.
Inverter current ≤ XA
continues for 3 min.
[Inverter fin temperature control]
Limited
• 10 sec.
OR &
• Matching of frequency
•15 sec.
Tfin≤174.2˚F
continues for 3 min.
Function
Not limited
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≥179.6˚F
INV. upper limit frequency:
1-step down from current
compressor frequency
Status quo
INV. upper limit frequency:
1-step up from current
compressor frequency
Tfin≥180˚F
Fin temp. standby
•Inverter current ≤ XA
&
•INV. upper limit frequency
Inverter current >XA
Without conditions
• When occurring 3 times within 60 min.,
the malfunction code "
• When occurring 4 times within 60 min.,
the malfunction code "
• Tfin<174.2˚F
&
• INV. upper limit frequency
Tfin≥179.6˚F
Without conditions
• When occurring 3 times within 60 min.,
the malfunction code "
Protection Control
X
Tb≥77˚F 13.7
Tb<77˚F 12.7
L8
" is output.
L9
" is output.
L4
" is output.
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