Daikin VRVIII-S, Service Manual

Page: 66 / 266

SiENBE34-703 Protection Control
Function 55
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 fin temperature control]
INV upper limit frequency:
1-step down from current
compressor frequency
INV upper limit frequency:
1-step up from current
compressor frequency
Inverter current
standby
Inverter current £ 12A
continues for 3 min.
Without conditions
Not limited
Inverter current >12A
&
·Inverter current12A
·INV upper limit frequency=max Hz
Inverter current>12A
Status quo
·10 sec.
·Matching of frequency
Limited
Inverter current
≥
13.1A continues for 260 sec.
• When occurring 4 times within 60 min.,
the malfunction code “L8” is output.
&
&
INV upper limit frequency:
1-step down from current
compressor frequency
Tfin
≤
76°C
continues for 3 min.
INV upper limit frequency:
1-step up from current
compressor frequency
Status quo
Without conditions
Fin temp. standby
• When occurring 4 times within 60 min.,
the malfunction code “L4” is output.
Tfin
≥
84°C
Limited
Not limited
Tfin
≥
79°C
• 10 sec.
• Macthing of frequency
&
• Tfin<76°C
• INV upper limit frequency=max Hz
Tfin
≥
79°C