Inverter Protection Control - Panasonic U-4..6ML5XPQ Service Manual

Panasonic
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 >12A
Limited
•10 sec.
&
•Matching of frequency
Inverter current ≤ 12A
continues for 3 min.
[Inverter fin temperature control]
Limited
• 10 sec.
&
• Macthing of frequency
Tfin≤76˚C
continues for 3 min.
Function
Not limited
INV upper limit frequency:
1-step down from current
compressor frequency
Status quo
INV upper limit frequency:
1-step up from current
compressor frequency
Inverter current ≥ 13.1A continues for 260 sec.
Inverter current
standby
Not limited
Tfin≥79˚C
INV upper limit frequency:
1-step down from current
compressor frequency
Status quo
INV upper limit frequency:
1-step up from current
compressor frequency
Tfin≥84˚C
Fin temp. standby
•Inverter current ≤ 12A
&
•INV upper limit frequency=max Hz
Inverter current >12A
Without conditions
• When occurring 4 times within 60 min.,
the malfunction code "L8 " is output.
• Tfin<76 ˚C
&
• INV upper limit frequency=max Hz
Tfin≥79˚C
Without conditions
• When occurring 4 times within 60 min.,
the malfunction code "L4" is output.
Protection Control
63