Protection Control
SiUS281117
Function and Control
47
4.4
Inverter Protection Control
Tb: Outdoor unit heat exchanger temperature
Tfin: Radiation fin temperature
Inverter current protection control and radiation fin temperature control are performed to prevent
tripping due to an error, or transient inverter overcurrent, and radiation fin temperature increase.
[Inverter overcurrent protection control]
[Inverter radiation fin temperature control]
Not limited
Inverter current > X A
Inverter current > X A
Inverter current
≥
24.9A
&
•
15 sec.
&
OR
Limited
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
≤
X A continues
for 3 min.
Status quo
Without conditions
X A
13.7
12.7
•
Inverter current
≤
X A
•
INV. upper limit frequency
• When occurring 3 times within 60 min.,
the error code "
L8
" is output.
• When occurring 4 times within 60 min.,
the error code "
L9
" is output.
•
10 sec.
•
Matching of frequency
Tb
≥
77˚F
Tb < 77˚F
Not limited
Tfin
≥
179.6˚F
Tfin
≥
179.6˚F
Tfin
≥
180˚F
Radiation fin temp. standby
&
Limited
INV. upper limit frequency:
1-step down from current
compressor frequency
&
Tfin
≤
174.2˚F
continues for 3 min.
INV. upper limit frequency:
1-step up from current
compressor frequency
Status quo
Without conditions
•
15 sec.
OR
• When occurring 3 times within 60 min.,
the error code "
L4
" is output.
• Tfin < 174.2˚F
• INV. upper limit frequency
• 10 sec.
• Matching of frequency
