Inverter Protection Control - Daikin VRVIII-S Service Manual

SiENBE34-703
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.
Function
Not limited
·Inverter current12A
&
·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 ≥ 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
Status quo
INV upper limit frequency:
1-step up from current
compressor frequency
Tfin≥84°C
Fin temp. standby
Inverter current>12A
Without conditions
• When occurring 4 times within 60 min.,
the malfunction code "L8" is output.
Tfin≥79°C
Without conditions
• When occurring 4 times within 60 min.,
the malfunction code "L4" is output.
Protection Control
55