Fault Indications/Fault Diagnostics - Siemens S5-135U/155U System Manual

Central Controllers and Expansion Units Power Supply Units
4.3.3

Fault Indications/Fault Diagnostics

This section explains where and how faults are indicated, and how to
interpret the LEDs.
Where are Faults
Faults of the system power supply, load power supply, battery supply and
Indicated?
fans are indicated by LEDs on the front plate of the power supply unit.
How are Faults
When all monitoring circuits are switched on (jumper settings), the following
Indicated and
indications can appear:
Interpreted?
"Voltage low" LED lights
up.
"MB low" LED lights up.
"RB low" LED lights up.
"Fan 1" LED lights up.
"Fan 2" LED lights up.
"Fan 3" LED lights up.
At least 2 "Fan" LEDs light
up as well as the "Alarm"
LED.
All 3 "Fan" LEDs flash and
the "Alarm" LED lights up.
The fan error is indicated approximately 6 s after the monitoring circuits are
switched on or 6 s after a reset is performed.
4-36
LED Indication
The voltage at the voltage monitor is
less than 14 V.
The lithium battery has failed or the
battery compartment is faulty.
(Precondition: no external bty voltage
is present).
The rechargeable battery has failed.
The speed of Fan 1 has dropped or
Fan 1 has stopped.
The speed of Fan 2 has dropped or
Fan 2 has stopped.
The speed of Fan 3 has dropped or
Fan 3 has stopped.
At least 2 fans have failed.
The air flow is inadequate.
Cause Action
Replace backup
battery or battery
compartment
Replace
rechargeable
battery
Replace fan
Replace fan
Replace fan
Replace fan
Replace filter
mat
System Manual
C79000-G8576-C199-06