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Siemens S5-135U/155U User Manual

Page 127

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4-61

System Manual
C79000-G8576-C199-06

You can set jumper F-R on the power supply units to choose whether or not
the air flow monitor should switch off the internal supply voltage V

o/p

(5 V)

when a fan fails.

S

Jumper F-R closed: V

o/p

shutdown (signaled by contact)

S

Jumper F-R open: no V

o/p

shutdown (signaled by contact)

If one or both fans are at standstill, the signaling relay drops out (monitor
output). The “Fan Fault” LED lights up simultaneously.

S

Relay contacts 2-1 closed: fan running

S

Relay contacts 2-3 closed: fan failure

Relay contacts 2-3 closed; this is also the normally closed contact during
power OFF (failsafe).

!

Caution

If an immediate shutdown is not possible, jumper F-R must be opened. In
this case you must ensure that the power supply is switched off after 60 s at
the latest. This can be achieved with a time relay, for example. It avoids
overheating and destruction of modules.

Setting the Fan
Monitor

Central Controllers and Expansion Units Power Supply Units