Inverter Protection Control - Daikin RXYQ72 Serivce 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 >Ia
INV upper limit frequency: 1-step down
from current compressor frequency
Inverter current >Ia
Inverter
current
> 34A
MgS Reset
OC function
→MgS off
[Inverter fin temperature control]
Tfin>183˚F
INV upper limit frequency: 1-step /
1 min down from current compressor
frequency
Tfin>183˚F
52
Not limited
Inverter current <Ia
&
INV upper limit frequency = 210 Hz
Under inverter current
protection control
Inverter current > Ib continues for 260 sec.
or
Inverter current > Ic continues for 5 sec.
Inverter current standby
Not limited
&
Under fin temperature
protection control
Tfin>192˚F
Fin temp. standby
Inverter current<Ia continues
for 3 min. or more.
INV upper limit frequency: 1-step up from
current compressor frequency
• When occurring 3 times within 60 min.,
the malfunction code "L8 " is output.
• When occurring 3 times within 30 min.,
the malfunction code "L9" is output
Tfin<178˚F
INV upper limit frequency = 210 Hz
Inverter current<178˚F continues
for 3 min. or more.
INV upper limit frequency: 1-step / 1 min
up from current compressor frequency
Interval
• When occurring 3 times within 60 min.,
the malfunction code "L4" is output.
SiUS39-601
25 A
Ia
Ib
26.1 A
Ic
31 A
Function