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2. Troubleshooting System Failures
13
Table 2-2: Power Failure Check Items
5 Error message output to the system operation
panel
Take the action against the corresponding error message in the manual
"Message Log Reference."
6 STATUS LED on BCU/CSU/MSU is lit in red,
other LEDs are OFF, and no message on the
system operation panel
1. Check the single/redundant configuration of BCU/CSU/MSU.
(1) For the single configuration, follow the step 3 and later.
(2) For the redundant configuration, follow the step 2 and later.
2. Check the active/standby state of BCU/CSU/MSU.
(1) If the failure occurs only in one system, replace the BCU/CSU/MSU.
You do not have to follow the step 3 and later.
(2) If the failure occurs in both systems, follow the step 3 and later.
3. Check the LED on the power supply.
(1) If ALARM LED is lit in red on the power supply, replace the power
supply with a new one.
(2) If both POWER LED and ALARM LED are OFF on the power
supply, implement "Table 2-2: Power Failure Check Items" If the
problem is not settled, replace the power supply with LED turned off.
(3) If all power supplies are running normally, leave those power supplies
as is.
4. Turn off all power supplies installed on the system.
5. At least two seconds elapse, turn on all power supplies installed on the
system.
(1) If this failure occurs on BCU/CSU/MSU, replace the BCU/CSU/
MSU.
No. Failure Action
1 Power switch on the power supply is OFF Turn on the power switch.
2
• Power cable is unplugged
• Power cable is not firmly connected to the system
• Power cable is not securely fastened by the slip-off
preventive clamp
Follow the steps below.
1. Turn off the power switch.
2. For DC power supply, turn off the breaker of power distribution
panel connected to the system.
3. Connect the power cable correctly.
4. If the power cable can be fastened by the slip-off preventive clamp,
fasten the power cable using it.
5. For DC power supply, turn on the breaker of power distribution
panel connected to the system.
6. Turn on the power switch.
3 Power supply is not securely mounted but loose Follow the steps below.
1. Turn off the power switch.
2. For DC power supply, turn off the breaker of power distribution
panel connected to the system.
3. When the power cable is fastened by the slip-off preventive clamp,
remove it from the power cable.
4. Remove the power cable.
5. Remove the power supply and insert it securely.
6. Attach the power cable.
7. If the power cable can be fastened by the slip-off preventive clamp,
fasten the power cable using it.
8. For DC power supply, turn on the breaker of power distribution
panel connected to the system.
9. Turn on the power switch.
4 Measured input power is out of the range below.
100VAC: 90 to 132VAC
200VAC: 180 to 264VAC
-48VDC: -40.5 to -57VDC
Note: Implement this matter only if input power can
be measured.
Contact the person in charge of the power facility and ask him/her to
take the action for input power.
No. Failure Action