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© 2019 OJ Electronics A/S
TROUBLESHOOTING
Symptom
Cause
Action
OJ GreenZone™
Module MP-Bus
inoperative – no light
in display
No power
Check that there is 24 VAC on entry terminals
1 and 2 and exit terminals 3 and 4.
If there is no voltage on exit terminals 3 and 4,
the components supplied from these terminals
(3 and 4) have either short-circuited or are
overloaded.
Defective OJ GreenZone™
Module MP-Bus
Replace OJ GreenZone™ Module MP-Bus.
No communication
to OJ GreenZone™
Module MP-Bus
Poor or no connection in
Modbus cable
Check Modbus cable.
Configuration of Modbus cable and connector
is shown in figs 6 and 7.
Repair or replace defective Modbus cable.
Incorrect connection of
Modbus cable
Check that the Modbus communication cable
is connected to the "Modbus in" connector
and looped to the next OJ GreenZone™
Module MP-Bus from the "Modbus out"
connector.
(See figs 4, 5 and 13.)
No communication
to OJ GreenZone™
Module MP-Bus
Defective OJ GreenZone™
Module MP-Bus
Replace OJ GreenZone™ Module MP-Bus.
Display shows "9"
OJ GreenZone™ Module
MP-Bus has not yet
received information on
section number from OJ
GreenZone™ Master
Wait until OJ GreenZone™ Master
has allocated a section number to OJ
GreenZone™ Module MP-Bus.
Poor or no connection in
Modbus cable
Check Modbus cable.
Configuration of Modbus cable and connector
is shown in figs 6 and 7.
Repair or replace defective Modbus cable.
Defective OJ GreenZone™
Master
Replace OJ GreenZone™ Master.
Defective OJ GreenZone™
Module MP-Bus
Replace OJ GreenZone™ Module MP-Bus.
Display shows "99"
OJ GreenZone™ Module
MP-Bus has not yet
received information on
zone number from OJ
GreenZone™ Master
Wait until OJ GreenZone™ Master has
allocated a zone number to OJ GreenZone™
Module MP-Bus.
OJ GreenZone™ Module MP-Bus
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