Inverter Protection Control - Daikin RXSQ24TAVJU Service Manual

SiUS331708EA
4.4

Inverter Protection Control

Inverter current protection control and inverter fin temperature control are performed to prevent tripping due to
error, transient inverter overcurrent, and fin temperature increase.
Inverter overcurrent protection control
Inverter current > 13.7 A (24/36 class)
Limited
10 seconds
•
&
Matching of frequency
•
Inverter current ≤ 13.7 A (24/36 class)
continues for 3 minutes
Radiation fin temperature control
Tfin ≥ 82˚C (179.6˚F) (24/36 class)
58˚C (136.4˚F) (48/60 class)
Limited
•
&
•
Tfin ≤ 79˚C (174.2˚F) (24/36 class)
55˚C (131˚F) (48/60 class)
continues for 3 minutes
Functions and Control
Not limited
21.8 A (48/60 class)
Compressor upper limit
frequency: 1-step down from
current compressor frequency
Current step maintained
21.8 A (48/60 class)
Compressor upper limit
frequency: 1-step up from
current compressor frequency
Inverter current
standby
Not limited
Compressor upper limit
frequency: 1-step down from
current compressor frequency
10 seconds
Matching of frequency
Current step maintained
Compressor upper limit
frequency: 1-step up from
current compressor frequency
Fin temperature standby
Inverter current ≤ 13.7 A (24/36 class)
•
&
21.8 A (48/60 class)
Compressor upper limit: Maximum frequency
•
Inverter current > 13.7 A (24/36 class)
Without conditions
Inverter current ≥ 22 A × 10% continues for 260 seconds
When occurring 4 times within 60 minutes,
the error code L8 is output.
Tfin: Fin thermistor temperature
• Tfin < 79˚C (174.2˚F) (24/36 class)
& 55˚C (131˚F) (48/60 class)
• Compressor upper limit: Maximum frequency
Tfin ≥ 82˚C (179.6˚F) (24/36 class)
58˚C (136.4˚F) (48/60 class)
Without conditions
Tfin ≥ 89˚C (192.2˚F) (24/36 class)
65˚C (149˚F) (48/60 class)
21.8 A (48/60 class)
When occurring 3 times within 60 minutes,
the error code L4 is output.
Protection Control
56