LG MULTI V 5 Manual Book page 74

Error No. Error Type Error Point
Network error of
242* Network Error
central controller
Error Diagnosis and Countermeasure Flow Chart
▒
Check 1. Checking Power source of IDU & ODU
whether the product (Circuit Breaker, Electrical wiring)
(IDU, ODU) is normal or not 2. Reset ODU Auto Addressing (refer to Xx page)
Abnormal
without Central controller 3. Check other error state after removing control system
Normal
1. Connect to comm. Port (CH)
Is communication cable 2. "BUS Wiring" is mandatory
wiring normal? 3. Check the Comm. cable
No
(disconnection / short / polarity)
<ex>
AC Ez + ACP IV Comm. cable Wiring
▒
AC Ez + AC Smart IV Comm. cable Wiring
▒
Yes
4. Check the maximum length of the RS485 line per port
- Total length ≤ 1km
- Length between products(or node) ≤ 200m
5. Check the maximum number of node (PI485 G/W, ACS Product, ODU)
on a RS485 comm. Port
"2X + Y + Z <= 32 EA"
- Multi V ODU : "X" EA
- PI485 (Multi / Single / ERV) : "Y" EA
- Slave Controller : "Z" EA
<ex>
AC Smart Premium(slave) 2ea + Multi V 6ea = 2 + (6*2) = 14 ≤ 32ea
146
_TROUBLE SHOOTING GUIDE BOOK
Main Reasons
1. Communication Wiring defect (Central con-
troller - ODU)
2. Communication defect between remote con-
troller and indoor unit
3. Indoor unit addressing setting error on
central controller
Check address of All IDU's address
Is central control addressing
(Duplication & Omission of IDU address)
normal?
Abnormal
- All IDUs should have unique central control address
Normal
There should be only one Master device on a communication line
Is Master/Slave setting
- ACP , ACP_BACnet, ACP_LONwork should be set Master device
of central controller normal?
No
- The other controller(AC Smart, AC Ez, AC Ez Touch) are settable device
<ex>
Central Control Wiring Diagram(Basic Scene)
▒
Yes
1. Try to change Group No. in AC
< AC Ez only >
2. It should be matched with corresponding IDU
"Group No." is set correctly.
No
(settable range : 0~F)
<ex>
Address Matching between AC Ez and IDUs
▒
If IDU address is 10~18, Group No. of AC Ez should be 1
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