Inverter Protection Control - Daikin R410As 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 >Ia
INV upper limit frequency: 1-step down
from current compressor frequency
Inverter current >Ia
[Inverter fin temperature control]
Tfin>84˚C
INV upper limit frequency: 1-step /
1 min down from current compressor
frequency
Tfin>84˚C
86
In the case of multi-outdoor-unit system, each INV compressor performs these controls in
the following sequence.
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>89˚C
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<81˚C
INV upper limit frequency = 210 Hz
Inverter current<81˚C 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.
Si39-302
200-V unit 400-V unit
25 A 13.5 A
Ia
Ib
26.1 A
Ic
31 A 16.5 A
Function