Service manual

SiUS28-902_a Protection Control
Function 32
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]
Not limited
Inverter current >XA
Inverter current
Inverter current ≥ 24.9A
>XA
•Inverter
current ≤ XA
•
INV. upper limit frequency
&
•10 sec.
•15 sec.
•Matching of frequency
&
• When occurring 3 times within 60 min.,
the malfunction code "
L8 " is output.
• When occurring 4 times within 60 min.,
the malfunction code "
L9 " is output.
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 ≤ XA
continues for 3 min.
Status quo
Without conditions
X
13.7Tb≥77˚F
12.7Tb<77˚F
Not limited
Tfin≥179.6˚F
Tfin≥179.6˚F
Tfin≥180˚F
Fin temp. standby
• Tfin<174.2˚F
• INV. upper limit frequency
&
• When occurring 3 times within 60 min.,
the malfunction code "
L4" is output.
Limited
INV. upper limit frequency:
1-step down from current
compressor frequency
• 10 sec.
• Matching of 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