Nibe MODBUS 40 Installer Manual page 16

Troubleshooting
STATUS LAMPS
LED lamps
The accessory board (AA9) in MODBUS 40 has eight status LED lamps for easy control and troubleshooting.
Designation LED status
VCC The LED lights continuously
SYNK -
COM2 The LED flashes
LEV -
- -
COM1 The LED flashes
RUN -
BATT -
MODBUS 40 HAS NO CONTACT WITH THE
CLIMATE UNIT (DOES NOT RESPOND)
• MODBUS 40 is not activated in heat pump/indoor
module menu 5.2 (menu 5.2.4 for NIBE F1345, F1355,
SMO 40, VVM 225, VVM 310, VVM 320, VVM 325
and VVM 500).
• Incorrectly connected cables between MODBUS 40
and heat pump/indoor module. Gives a communication
alarm in the heat pump's/indoor module's display.
• Incorrect software in the heat pump. The software
version in the heat pump must be higher than 3000.
See section "General" on page 10.
• Modbus 40 incorrectly connected to Modbus master.
Check that A is connected to + and B to -.
NOTE
Find more information about MODBUS 40 at
www.nibe.eu/modbus.
16
Explanation
Voltage to MODBUS 40
No function
Active communication between MODBUS 40 and external
control
No function
No function
Active communication between MODBUS 40 and heat pump
No function
No function
RESETTING MODBUS 40
To reset the device, press the reset button as illustrated.
The device then restarts. Settings in the climate system
and Modbus master are not affected by the reset.
Technical data
TECHNICAL SPECIFICATIONS
MODBUS 40
Rated voltage
Dimensions
Part No.
Reset button
12 VDC 45-80 mA
154 x 108 x 40 mm
067 144
MODBUS 40 | GB