Fans and fan monitoring
The following table contains several examples.
Requirement:
Enable EN present, jumper F - R closed
Causes
LED Indication
Relay
Reaction
Fans
Air filter/air
flow
Fan 1 to fan 3 Alarm Fan
Warning
Fan
Alarm
All fans in
order
In order
All LEDs dark Dark
-
-
5 V, 15 V, 24 V present,
fans 1 to 3 running
One fan failed In order
Corresponding
LED lit
Dark
Active
-
5 V, 15 V, 24 V present,
faulty fan switched off,
the other two fans running at
increased speed
Two fans
failed
In order
Corresponding
LEDs lit
Lit
Active
Active Power supply switches off
All fans in
order
Dirty/halved
All LEDs
flashing
Lit
-
Active Power supply switches off
Requirement:
Enable EN present, jumper F - R open
Causes
LED Indication
Relay
Reaction
Fans
Air filter/air
flow
Fan 1 to fan 3 Alarm Fan
Warning
Fan
Alarm
All fans in
order
In order
All LEDs dark Dark
-
-
5 V, 15 V, 24 V present,
fans 1 to 3 running
One fan failed In order
Corresponding
LED lit
Dark
Active
-
5 V, 15 V, 24 V present,
faulty fan switched off,
the other two fans running at
increased speed
Two fans
failed
In order
Corresponding
LEDs lit
Lit
Active
Active 5 V, 15 V, 24 V present,
defective fan switched off,
one fan running with
increased speed
All fans in
order
Dirty/halved
All LEDs
flashing
Lit
-
Active 5 V, 15 V, 24 V present,
fans 1 to 3 running
Note:
When the jumper "BB - AA" is closed the relay "Fan Alarm" is also
activated by the "output inhibit" signal.
4
Power Supply Units
System Manual
C79000-B8576-C199-03
4 - 41