Troubleshooting - Mitsubishi Electric NZ2FTGN User Manual

Troubleshooting

If problems occur on the NZ2FTS-60RD4, perform the following.
Checking with LEDs
■When the module status LED turns on in red
Check the following items in order from the top.
Item
Is the external power supply (24VDC) wired?
Is the external power supply (24VDC) turned on?
Is the voltage of the external power supply
(24VDC) within the specified range?
Is the I/O module mounted properly?
Has a channel error occurred?
Has a firmware error occurred?
■When the module status LED turns off
Check the following item.
Item
Does the externally supplied coupler power
supply voltage reach the voltage of the
performance specifications?
■When the channel status LED turns on in red
Check the following items in order from the top.
Item
Is the input signal (process value) within the input
range?
Are there any problems with the cable wiring?
Does the externally supplied coupler power
supply voltage reach the voltage of the
performance specifications?
Is there a problem with the connection of the cold
junction compensation resistor?
If the problem persists after checking the above, acquire the service file, and please consult your local Mitsubishi
representative. ( Page 88 Acquisition of the service file)
The LED status can also be checked on the Web server. ( Page 70 "Overview")
Action
Wire the external power supply (24VDC).
Turn on the external power supply (24VDC).
Set the voltage of the external power supply within the range of performance specifications.
Mount the I/O module again by pressing it to the coupler until it clicks.
Check whether the channel status LED is on in red. If it is, perform the actions required when the channel
status LED is on in red.
Check the firmware version. Update it if necessary.
Action
When all LEDs other than the module status LED are on in red, a coupler power supply bus error has
occurred. Set the coupler power supply voltage within the range of the performance specifications.
Action
Check that the input signal (process value) is within the input range. Revise the input signal or the input
range setting if the input signal is outside of the range.
Check that the cable wiring is not disconnected/short circuited.
Set the coupler power supply voltage within the range of the performance specifications.
Check that the cold junction compensation resistor is connected to the channel set with the parameter
"Cold junction compensation".
18 TEMPERATURE INPUT MODULE
18.1 NZ2FTS-60RD4
18
507