OJ Electronics GreenZone Module M Instruktionen Seite 14

English / Instruction
Symptom
Display shows "99"
Display shows "SC"
1. Connected Direct
Modbus actuators
inoperative
2. LED does not flash
despite a Modbus
actuator being
connected
Symptom
Digital output
(terminals 12 and 13)
not activated when
heating is demanded
14
Cause
OJ GreenZone™
Module M has not yet
received information on
zone number from OJ
GreenZone™ Master
Poor or no connection in
Modbus cable
Defective OJ GreenZone™
Master
Defective OJ GreenZone™
Module M
Sensor short-circuited
Incorrect addressing of
actuators
Poor or no connection in
Modbus cable
Defective Modbus actuator
Defective OJ GreenZone™
Module M
Cause
Lacking power supply
Defective OJ GreenZone™
Module M
© 2017 OJ Electronics A/S
OJ GreenZone™ Module M
Action
Wait until OJ GreenZone™ Master has
allocated a zone number to OJ GreenZone™
Module M.
Check Modbus cable.
Configuration of Modbus cable and connector
is shown in figs 6 and 7.
Repair or replace defective Modbus cable.
Replace OJ GreenZone™ Master.
Replace OJ GreenZone™ Module M.
Check the connected PT1000 sensor.
The sensor should be connected to the RJ12
connector marked "L" in fig. 3 – correct
connection is shown in fig. 10.
Check sensor resistance.
The measured resistance should be
approximately 1078 Ω at 20°C.
Check actuator addresses.
The addresses should be set in accordance
with table 1 in these instructions.
Check Modbus cable.
Configuration of Modbus cable and connector
is shown in figs 6 and 7.
Repair or replace defective Modbus cable.
Replace Modbus actuator.
Replace OJ GreenZone™ Module M.
Action
The digital output
a potential-free output (relay) which must be
powered by an external power supply.
Replace OJ GreenZone™ Module M.
(terminals 12 and 13) is