Inverter Protection Control - Daikin RQYQ140-180PY1 Service Manual

Detailed Control Functions

2.6.4 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.
★
In the case of multi-outdoor-unit system, each INV compressor performs these controls in the following sequence.
[Inverter overcurrent protection control]
★
Perform the following control of integrated as well as multi units for each INV compressor.
Inverter current value
>14.7A
INV. Comp.:
1 step down / 10 sec.
[Inverter fin temperature control]
★
Perform the following control of integrated as well as multi units for each INV compressor.
Tfin > 84˚C
INV. Comp.:
1 step down / 10 sec.
51
Normal operation
INV. current value < 14.7 A
continues for 20 sec.
• INV. current value > 14.7 A
&
• After 10 sec.
INV. current value > 16.1A continues for
260 seconds.
Restart standby
(3 times per 60 min. at max.)
Normal operation
Tfin < 81˚C
continues for 3 min.
• Tfin > 84˚C
&
• After 10 sec.
Tfin > 93˚C
Restart standby
(3 times per 60 min. at max.)
• Inverter current value < 14.7 A
&
• INV upper limit frequency = max (210 Hz)
4 times per 60 min.
Stop due to malfunction
(L8 displayed)
• Tfin < 81˚C
&
• INV upper limit frequency = max (210 Hz)
4 times per 60 min.
Stop due to malfunction
(L4 displayed)
SiBE341001
INV. Comp.:
1 step up / 20 sec.
INV. Comp.:
1 step up / 3 min.
Function