Inverter Protection Control - Daikin E-Series 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≥78°C
Limited
• 10 sec.
&
• Matching of frequency
Tfin≤75°C
continues for 3 min.
76
Not limited
• Inverter current≤23.8A
&
• INV upper limit frequency=max Hz
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 continues for 260 sec.
Inverter current
standby
Not limited
• Tfin<75 °C
&
• INV upper limit frequency=max Hz
INV upper limit frequency:
1-step down from current
compressor frequency
Tfin≥78°C
Status quo
Without conditions
INV upper limit frequency:
1-step up from current
compressor frequency
Tfin≥83°C
Fin temp. standby
Inverter current>23.8A
Without conditions
• 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.
SiENBE18-621
Function