Inverter Protection Control - Daikin ALTHERMA HT Service Manual

ESIE09-08B

Inverter Protection Control

4.4
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 [R-410A]
Inverter current >12A
Limited
• 10 sec.
&
• Matching of frequency
Inverter current
continues for 3 min.
Inverter overcurrent protection control [R-134a]
Inverter current > see table
Limited
• 10 sec.
and
• Matching of frequency
or
15 sec.
Inverter current < see table
continues for 3 min.
Function
Not limited
• Inverter current
&
• INV upper limit frequency=max Hz
INV upper limit frequency:
1-step down from current
compressor frequency
Status quo
12A
INV upper limit frequency:
1-step up from current
compressor frequency
Inverter current
Inverter current
standby
Not limited
and
or
compressor stop
INV upper limit frequency:
1-step down from current
compressor frequency
Inverter current > see table for 90 sec.
Status quo
Without conditions
INV upper limit frequency:
1-step up from current
compressor frequency
Inverter current > 13.1A continues for 260 sec.
Inverter current
standby
12A
Inverter current > 12A
Without conditions
13.1A continues for 260 sec.
• When occurring 4 times within 60 min.,
the malfunction code "L8" is output.
• Inverter current < see table
• INV upper limit frequency = max Hz
Protection Control
Table
230V
400V
current value 23,8A 9,5A
59