Fault Indications/Fault Diagnostics - Siemens S5-155U System Manual

4.3.3
Fault Indications/Fault
Diagnostics
Where are faults indicated?
How are faults indicated and
interpreted?
System Manual
C79000-B8576-C199-03
This section explains where and how faults are indicated, and how to
interpret the indications.
Faults of the system power supply, load power supply, battery supply
and fans are indicated by LEDs on the front plate of the power supply
unit.
When all monitoring circuits are switched on (jumper settings), the
following indications can appear:
LED Indication Cause
"Voltage low" LED The voltage at the voltage
lights up. monitor is less than 14 V.
"MB low" LED The lithium battery has failed
lights up. or the battery compartment is
faulty. (Precondition: no
external battery voltage is
present).
"RB low" LED The rechargeable battery has
lights up. failed.
"Fan 1" LED lights The speed of Fan 1 has
up. dropped or Fan 1 has stopped.
"Fan 2" LED lights The speed of Fan 2 has
up. dropped or Fan 2 has stopped.
"Fan 3" LED lights The speed of Fan 3 has
up. dropped or Fan 3 has stopped.
At least 2 "Fan" At least 2 fans have failed.
LEDs light up as
well as the "Alarm"
LED.
All 3 "Fan" LEDs The air flow is inadequate.
flash and the
"Alarm" LED lights
up.
For all faults, the indication appears 6 s after the monitor has
responded. (Exception: The "Voltage low" LED lights up
immediately.)
Power Supply Units
Action
Replace
backup
battery or
battery
compartment
Replace
rechargeable
battery
Replace fan
Replace fan
Replace fan
Replace fan
Replace filter
mat
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