Toshiba BMS-SM1280HTLE Service Manual page 51

15-9.How to Identify Defective Part at S06 (BMS-IFWH
Communication Error) or S07 (BMS-IFDD
Communication Error) Occurrence
No.
1 Check if the RS-485 LED (Green) is blinking at the Energy Monitoring Relay Interface or the Digital Input / Output Relay Interface.
(If blinking)
(If the LED is not blinking)
2 Check that S06 or S07 has occurred on all the interfaces.
(When they have occurred on some of the
interfaces)
(When they have occurred on all of the air
conditioners)
Check point
Error message
Defective part:
1.The RS-485 send circuit of the interface
2.Duplicate setting of the interface address
3.The RS-485 receive circuit of the controller
Defective part:
1.The RS-485 wiring
2.The RS-485 send circuit of the controller
3.The power source or switch setting of the interface.
4.The RS-485 receive circuit of the interface
Error message
• Defective part:
The RS-485 wiring on the interfaces
• Solution:
Identify the defective part of the communication wiring based on the
S06 or S07 occurrence location and the schematic, and check the
communication wiring connection state, continuity, and polarity.
• Defective part:
The RS-485 wiring on the controller
• Solution:
Check the communication wiring continuity and polarity.
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