Inverter Protection Control - Daikin VRV III RXYQ5-54PY1 Service Manual

Si34-601A
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]
Invertercurrent >14.7A
INV upper limit frequency: 1-step down
from current compressor frequency
Inverter current >14.7A
[Inverter fin temperature control]
Tfin>84˚C
INV upper limit frequency: 1-step /
1 min down from current compressor
rps
Tfin>84˚C
Function
In the case of multi-outdoor-unit system, each INV compressor performs these controls in
the following sequence.
Nomal operation
Inverter current <14.7A
&
INV upper limit frequency = max
Under inverter current
protection control
Inverter current > 16.1A continues for 260 sec.
Inverter current standby
Nomal operation
&
Under fin temperature
protection control
Tfin>93˚C
Fin temp. standby
Inverter current<14.7A continues
for 20 sec. or more.
INV upper limit frequency: 1-step up from
current compressor frequency
• When occurring 4 times within 60 min.,
the malfunction code "L8 " is output.
Tfin<81˚C
INV upper limit rps = max
Inverter fin temp.<81˚C continues
for 3 min. or more.
INV upper limit frequency: 1-step / 1 min up
from current compressor frequency Interval
• When occurring 4 times within 60 min.,
the malfunction code "L4" is output.
Protection Control
121