Siemens S5-155U System Manual page 111

Fans and fan monitoring
Causes
Fans Air filter/air
flow
All fans in In order
order
One fan failed In order
Two fans In order
failed
All fans in Dirty/halved
order
Causes
Fans Air filter/air
flow
All fans in In order
order
One fan failed In order
Two fans In order
failed
All fans in Dirty/halved
order
System Manual
C79000-B8576-C199-03
The following table contains several examples.
Requirement:
Enable EN present, jumper F - R closed
LED Indication Relay
Fan 1 to fan 3 Alarm Fan
Warning
All LEDs dark Dark -
Corresponding Dark Active
LED lit
Corresponding Lit Active
LEDs lit
All LEDs Lit -
flashing
Requirement:
Enable EN present, jumper F - R open
LED Indication Relay
Fan 1 to fan 3 Alarm Fan
Warning
All LEDs dark Dark -
Corresponding Dark Active
LED lit
Corresponding Lit Active
LEDs lit
All LEDs Lit -
flashing
Note:
When the jumper "BB - AA" is closed the relay "Fan Alarm" is also
activated by the "output inhibit" signal.
Power Supply Units
Reaction
Fan
Alarm
- 5 V, 15 V, 24 V present,
fans 1 to 3 running
- 5 V, 15 V, 24 V present,
faulty fan switched off,
the other two fans running at
increased speed
Active Power supply switches off
Active Power supply switches off
Reaction
Fan
Alarm
- 5 V, 15 V, 24 V present,
fans 1 to 3 running
- 5 V, 15 V, 24 V present,
faulty fan switched off,
the other two fans running at
increased speed
Active 5 V, 15 V, 24 V present,
defective fan switched off,
one fan running with
increased speed
Active 5 V, 15 V, 24 V present,
fans 1 to 3 running
4
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