201703
85
P
art 4 - Diagnosis and T
roubleshoo
ting
The specific error codes can also be obtained from the LED indicators LED1/LED2 on the outdoor unit main PCB. Refer to
Figure 4-2.5 in Part 4, 2.1 “Outdoor Unit PCBs”.
Table 4-4.4: Errors indicated on LED1/2
LED1/2 flashing pattern
Corresponding error
Flashes 8 times and stops for 1 second, then repeats
L0 - Inverter module protection
Flashes 9 times and stops for 1 second, then repeats
L1 - DC bus low voltage protection
Flashes 10 times and stops for 1 second, then repeats
L2 - DC bus high voltage protection
Flashes 12 times and stops for 1 second, then repeats
L4 - MCE error
Flashes 13 times and stops for 1 second, then repeats
L5 - Zero speed protection
Flashes 15 times and stops for 1 second, then repeats
L7 - Phase sequence error
Flashes 16 times and stops for 1 second, then repeats
L8 - Compressor frequency variation greater than
15Hz within one second protection
Flashes 17 times and stops for 1 second, then repeats
L9 - Actual compressor frequency differs from
target frequency by more than 15Hz protection
Principle of DC inverter
4.20.5
① 380-415V AC power supply change to DC power supply after bridge rectifier.
② Contactor is open the current across the PTC to charge capacitor, after 5 seconds the contactor closed.
③ The capacitor output steady 540V DC power supply for inverter module P N terminals.
Power
supply
(380V AC)
A
B
C
Bridge
rectifier
PTC
Contactor
Inductor
Capacitor
Inverter module
(V
P-N
: 540V DC)
U
V
W
Compressor
P
N
ƻ
3
ƻ
1
ƻ
2
MUNDOCLIMA AEROTHERM V17 - BIBLOC
