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Check wiring polarity.
Faulty field wiring
Check continuity of field wiring
Sensor fault
If possible, check sensor reading
is as expected using a multimeter
Unit of measure not as expected
(e.g. thermistor value shown in
Ω
instead of °C)
Unit of measure not applied
Apply unit of measure to the input
13.3.
MelcoREMOTE does not power up
Problem
Possible cause(s)
Possible solution(s)
No beep heard and no LCD
backlight when applying power,
but unit does have mains power
Loose wiring
Check connections between
power supply and MelcoREMOTE
are secure
Damaged/faulty power supply
Check 24VDC is being supplied
from the power supply using a
multimeter, if not contact supplier
Over-current or short circuit
Remove all connections from
MelcoREMOTE other than power
supply, then troubleshoot field
wiring
No mains power
Tripped switch or circuit breaker
Reset the switch or circuit breaker
MelcoREMOTE constantly resets
Ancillary equipment (e.g.
contactors or external I/O
modules) drawing too much
current
Power ancillary equipment from a
separate power supply ensuring a
common ground connection
between power supplies
Short circuit across 24VDC power
supply
Remove the short circuit
Damaged/faulty power supply
Check 24VDC is being supplied
from the power supply using a
multimeter, if not contact supplier
Summary of Contents for MelcoREMOTE
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Page 7: ...Page 7 of 52 Fig 2 Overview I 2 ...
Page 46: ...Page 46 of 52 RS 485 Expansion Devices Address Description ...
Page 47: ...Page 47 of 52 Centralised Controllers Modbus TCP Devices IP Address Description ...
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