Daikin VRV - WII, Service Manual

Page: 87 / 312

Protection Control SiUS30-604
74 Function
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.
∗
This control is carried out in each outside unit.
[Inverter overcurrent protection control]
[Inverter fin temperature control]
Not limited
Inverter current standby
Inverter current < Ia
INV upper limit frequency = 230 Hz
&
Inverter current
> 25.1A for 260 sec. (220V unit)
220-V unit
Ia 26.5 A
• When occurring 3 times within 60 min.,
the malfunction code “L8” is output.
Comp. upper limit down 1 step/15 sec.
Comp. upper limit up 1 step/20 sec.
Inverter current > Ia
Inverter current < Ia
continues for 3 min. or more
Invertercurrent > Ia
Less than 2 times
within 60 min.
Normal operation
Tfin > 122
°
F Tfin < 86
°
F
Fin temp. standby
Tfin < 174.2
°
F
Compressor up limit frequency = 230 Hz
&
Tfin > 208.4
°
F
• When occurring 3 times within 60 min.,
the malfunction code “L4” is output.
Tfin : Inverter fin temperature
Cooling fan for electric
component box
Comp. upper limit down 1 step/15 sec.
Comp. upper limit up 1 step/1 min.
Tfin
≤ 174.2 °
F
for continues 3 min.
Tfin
≥
179.6
°
F
Tfin
≥
179.6
°
F
Less than 2 times
within 60 min.