Inverter Protection Control - Daikin RTSQ20PY1 Service Manual

Protection Control
7.4

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.
★
7.4.1 Inverter Overcurrent Protection Control (Refer to page 351 and 352)
★
Inverter current > B
INV. compressor (see *1):
1 step down per 10 sec.
Restart standby:
(3 times per 60 min. at maximum)
7.4.2 Inverter Fin Temperature Control
★
Tfin ≥ 84°C
(*1)
INV. compressor (see *2):
1 step down per 10 sec.
Restart standby:
(3 times per 60 min. at maximum)
103
In the case of multi-outdoor-unit system, each INV compressor performs these controls in
the following sequence.
This control is conducted by each INV. compressor.
Normal operation
& • Inverter current < B
• Upper limit of compressor operating frequency = 210 Hz
Inverter current < B continues for
a period of consecutive 20 sec.
• Inverter current >B
&
• A lapse of 10 sec.
Inverter current > C continues for a
period of consecutive 260 sec.
Stop due to malfunction
This control is conducted by each INV. compressor.
Normal operation
• Tfin < 81°C
&
• Upper limit of compressor operating frequency = 210 Hz
Tfin ≤ 81°C continues for
a period of consecutive 3 min.
• Tfin ≥ 84°C
&
• A lapse of 10 sec.
Tfin > 93°C
Stop due to malfunction
INV. compressor (see *1):
1 step up per 20 sec.
Occur 4 times per 60 min.
L8
( displayed)
INV. compressor (see *2):
1 step up per 3 min.
Occur 4 times per 60 min.
L4
( displayed)
SiBE31-801_C
*1: For INV. compressor steps, refer
to information on P.92 and 93.
*2: For values B and C, refer to the
table shown below.
B
Outdoor unit 14.7A 16.1A
Function unit 14.7A 16.1A
*1: Tfin: Value detected by the
fin thermistor.
*2: For INV. compressor steps,
refer to information on P.92
and 93.
C
Function