6F3B0253
10. Troubleshooting
10.1.1Power supply check
If the PWR (power) LED is not lit after power on, check the following points.
Check the power connection
Correct
Check the power voltage at the
Normal
Remove the programmer port connector
Still unlit
Remove the 24Vdc service power terminals if it is used
Still unlit
Remove the I/O modules.
Lit
Confirm the internal 5Vdc current consumption if I/O module is used.
Within the limit
Insert the removed option modules one by one to pinpoint the faulty card.
Connection terminals are correct. The terminal screws are not loose. The terminal block is installed securely.
85 to 132/170 to 264Vac (50/60 Hz) or 20.4 to 28.8Vdc (DC power)
If the PWR LED becomes normal, the internal 5Vdc can be shorted in the external connections of this port.
If the PWR LED becomes normal, the 24Vdc service power can be over load.
If the PWR LED is still unlit, the
The 5Vdc capacity for I/O modules is max. 1.5A.
(Refer to section 2.1.)
Replace the faulty I/O module.
Basic Hardware and Function 283
