Inverter Protection Control - Daikin VRV II-Q RQYQ8-48PY1B Service Manual

SiBE341027

2.5.4 Inverter Protection Control

Inverter current protection control and inverter fin temperature control are performed to prevent tripping due to
an error, or transient inverter overcurrent, and fin temperature increase.
[Inverter overcurrent protection control]
In the case of multi-outdoor-unit system, each INV. compressor performs these controls in the following sequence.
Inverter current value
>26.5A
INV. Comp.: 1 step down
[Inverter fin temperature control]
In the case of multi-outdoor-unit system, each INV. compressor performs these controls in the following sequence.
Tfin > 84˚C
INV. Comp.: 1 step down
Function
Normal operation
INV. current value < 26.5 A
continues for 20 sec.
• INV. current value > 26.5 A
&
• After 15 sec.
INV. current value > 27.6A continues for
260 seconds.
Restart standby
(3 times per 60 min. at max.)
Normal operation
(Without preconditions)
Current step maintenance
• Tfin > 84˚C
&
• After 15 sec.
Tfin > 98˚C
Restart standby
(3 times per 60 min. at max.)
• Inverter current value < 26.5 A
&
• INV. upper limit frequency = max (210 Hz)
4 times per 60 min.
Stop due to error
L8
(" " displayed)
• Tfin < 81˚C
&
• INV upper limit frequency = max (210 Hz)
Tfin < 81˚C
continues for 3 min.
(Without preconditions)
4 times per 60 min.
Stop due to error
L4
(" " displayed)
Detailed Control Functions
INV. Comp.: 1 step up
INV. Comp.: 1 step up
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