Visual Inspection - Mitsubishi Electric Q26UD(E)HCPU User Manual

15.1

Visual Inspection

Visually check the following.
(1) LED status
Check if there is a hardware failure or not. Check the status of each LED in the following order.
For the module status corresponding to the LED indication, refer to the "Part Names" section.
• CPU module (
• Power supply module (
1.
Power on the system. Check the POWER LED status of the power supply module.
If the POWER LED does not turn on even when power is supplied, perform the following troubleshooting.
Page 278, Section 15.1.1
2.
Check the color of the POWER LED.
When the POWER LED does not turn on in green, perform the following troubleshooting.
Page 278, Section 15.1.2
3.
When using the Life detection power supply module, check the LIFE LED status.
When the LIFE LED does not turn on in green or orange, perform the following troubleshooting.
Page 279, Section 15.1.3
4.
Check the MODE LED status of the CPU module.
When the MODE LED does not turn on, perform the following troubleshooting.
Page 280, Section 15.1.4
5.
Check the RUN LED status of the CPU module.
When the RUN LED does not turn on, perform the following troubleshooting.
Page 281, Section 15.1.5
6.
When using the High Performance model QCPU, Process CPU, or Redundant CPU, check the
BOOT LED status.
When the BOOT LED flickers, perform the following troubleshooting.
Page 281, Section 15.1.6
7.
Check the ERR. LED status of the CPU module.
When the ERR. LED is on or flickering, an error exists.
Check the error with the programming tool. (
8.
Check the BAT. LED status of the CPU module.
When the BAT. LED is on, the battery voltage is low.
Replace the battery. (
(2) Communication cable and wiring
Check if any communication cable has a problem or not. Check also that connectors and terminal blocks are
correctly mounted or wired.
Page 103, Section 4.8
Page 119, Section 6.1)
Page 188, Section 7.1)
Page 255, Section 13.3)
CHAPTER 15 TROUBLESHOOTING
Page 282, Section 15.2)
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