Daikin VRV Service Manual page 95

Si30-408
3.8.2 Malfunction Code List (3 phase 200~220V class model)
Code Name of items
L5 Instantaneous
overcurrent
Items
L6 Instantaneous
relating
overcurrent
with
L9 Stall prevention
electric
current
during unit
operation
L8 Electronic thermal
sensor
LC Transmission
malfunction between
inverter PC board
and outdoor unit PC
board
LO Faulty inverter PC
board
Items other
than LA Faulty power
electric transistor
current
(control,
safety
device,
L4 Radiation fin
signal)
temperature rising
P4 Faulty sensor for
radiation fin
temperature
Note; (G): VRV-G type, (H): VRV-H type, (K): VRV-K type
Example of overseas 400 volts class model
Current protection set value
Code Name of Item
L5 Instantaneuos
Electronic thermal
detector 2
Item relating
with electric L8
current
Electronic thermal
during unit
detector 1
operation
L9 Stall prevention
*1 Malfunction detection by direct current inside inverter PCB
*2 Malfunction detection by effective current of compressor part
* Above current detection method--- Shunt resistance
Troubleshooting
Detecting condition, Location (Model)
When DC output current exceeds 70 A even
instantaneously.
(G) shunt, (K) DC·CT
When AC output current exceeds 70 A even
instantaneously.
When INV1 compressor is 30 Hz or less,
AC 33A or more for a period of 5 seconds
DC 54A or more for a period of 30 seconds
AC 27.5A or more for a period of 3 seconds (H) AC·CT
When INV1 pressure is 34 Hz or more,
DC 54A or more
DC 27.5A or more
AC 27.5A or more
On outdoor PC board, signal is detected between
outdoor PC board and inverter PC board. (Whether
signal returns from inverter PC board or not?)
The safety device of inverter system activates in
microcomputer on inverter.
Only for (G)
Output signal sent to power transistor is detected in
inverter PC board.
Only for (G)
When radiation fin temperature reaches 90 °C or more,
(H / K)
P4 also may occur.
Fin temperature of 90°C or more is detected
during compressor halts, and does not lower to 80°C or
less within 30 minutes.
For fin thermal during compressor halts Fin thermal (G)
DC CT: Detected by direct current converter
·
AC CT: Detected by alternative current converter
·
Shunt: Detected by shunt resistance
Detection condition
Detected by peak current, operation
time 10 micro sec (When exceed this
value, stop immediately.)
Detected by secondary current,
Malfunction is detected when exceed
this current value for period of 5
seconds
Detected by secondary current,
Malfunction is detected when exceed
this current value for period of 260
seconds
Detected by secondary current,
Malfunction is detected when exceed
this current value before reaching
20Hz at starting.
Method of Troubleshooting
Compressor lock
Power transistor short
(G) 75A circuit
(H) 85A (INV
(K) 76.5A
(H) AC·CT
Differential pressure
(K) DC·CT (faulty equalizing)
(G) shunt Liquid return
Oil shortage
(INV unit)
(G) shunt Overload
(K) DC·CT Compressor
(H) AC·CT INV / PC board
Disconnection between
outdoor PC board and
INV PC board
(INV PC board)
(Outdoor PC board)
INV PC board
Power transistor
Mgsw
Disconnection between
INV PC board and
compressor
Compressor
(Power unit)
Heat radiation of fin
(LO displays for G) Power transistor
INV PC board
Radiation fin thermistor
Radiation fin thermistor
Fin thermistor (H / K)
Model
RX(Y)(Q)-M,
RX(Y)Q-MA
REYQ-M
*1 36amps *1 30amps
(*2 25amps) (*2 21amps)
*2 16.5amps *2 17amps
*2 15amps *2 17amps
Malfunction is
not detected
by electrical
*2 15amps
current
Main malfunction point
unit)
1
Main mulfunction point
Compressor lock,
Compressor motor short,
Cable short circuit,
Inveter mulfunction
Compressor mulfunction,
Compressor overload
Abnormal differential
pressure , Liquid
compression,
Shortage of rubricating
oil, Compressor
malfunction
91