Inverter Protection Control - Daikin VRV IV-S RXTQ-TAVJU Series Service Manual

SiUS331604E
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 > 22 A
Limited
10 seconds
•
&
Matching of frequency
•
Inverter current ≤ 22 A
continues for 3 minutes
Radiation fin temperature control
Tfin ≥ 79˚C (174.2˚F)
Limited
• 10 seconds
&
Matching of frequency
•
Tfin ≤ 76˚C (168.8˚F)
continues for 3 minutes
Functions and Control
Not limited
Inverter current ≤ 22 A
•
&
• Compressor upper limit: Maximum frequency
Compressor upper limit
frequency: 1-step down from
current compressor frequency
Current step maintained
Compressor upper limit
frequency: 1-step up from
current compressor frequency
Inverter current ≥ 22 A × 10% continues for 260 seconds
Inverter current
standby
Not limited
• Tfin < 76˚C (168.8˚F)
&
Compressor upper limit: Maximum frequency
•
Compressor upper limit
frequency: 1-step down from
current compressor frequency
Current step maintained
Compressor upper limit
frequency: 1-step up from
current compressor frequency
Tfin ≥ 84˚C (183.2˚F)
Fin temperature standby
Inverter current > 22 A
Without conditions
When occurring 4 times within 60 minutes,
L8
the error code is output.
Tfin: Fin thermistor temperature
Tfin ≥ 79˚C (174.2˚F)
Without conditions
When occurring 4 times within 60 minutes ,
the error code
Protection Control
L4
is output.
48