Inverter Protection Control - Daikin ERQ 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 >12A
Limited
•10 sec.
&
•Matching of frequency
Inverter current ≤ 12A
continues for 3 min.
[Inverter fin temperature control]
Tfin≥79˚C
Limited
• 10 sec.
&
• Macthing of frequency
Tfin≤76˚C
continues for 3 min.
36
Not limited
•Inverter current ≤ 12A
&
•INV upper limit frequency=max Hz
INV upper limit frequency:
1-step down from current
compressor frequency
Inverter current
Status quo
Without conditions
INV upper limit frequency:
1-step up from current
compressor frequency
Inverter current ≥ 13.1A continues for 260 sec.
Inverter current
standby
Not limited
• Tfin<76 ˚C
&
• INV upper limit frequency=max Hz
INV upper limit frequency:
1-step down from current
compressor frequency
Tfin≥79˚C
Status quo
Without conditions
INV upper limit frequency:
1-step up from current
compressor frequency
Tfin≥84˚C
Fin temp. standby
>12A
• When occurring 4 times within 60 min.,
the malfunction code "L8 " is output.
• When occurring 4 times within 60 min.,
the malfunction code "L4" is output.
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ESIE09-05
Function