Ventilation/Cooling; Mounting Guidelines And Noise Immunity - Siemens SIMADYN D Hardware Manual

Aotewell Ltd
2.2.5

Ventilation/cooling

Fan monitoring
WARNING
!
Fan change
Self-convection
2.2.6

Mounting guidelines and noise immunity

Ground
connections
Hardware - SIMADYN D
Edition 04.2011
HongKong|UK|China
www.aotewell.com
The power supplies for SR12.1 and SR12.3 have 1 fan.
The power supplies for SR24.1 and SR24.3 have 3 fans.
The subracks do not have an air filter. If a filter is required, this must be
provided at the cabinet.
The fans are monitored by the power supply (fan speed). At power-up, the
monitoring is enabled with a time delay to ensure that the subrack reliably
runs-up.
If a fault condition develops, a message is output via a relay contact
(24 V, 100 mA) at connector X2, pins 3 and 4:
 Relay contact closed:
 Relay contact open :
The subrack may not be used if the fan has a fault, as reliable
operation of the boards cannot be guaranteed due to the danger of
excessive temperature rise.
It is recommended that the fan is changed after approximately 40,000
operating hours at a 50° C ambient temperature. The power supply must
be removed. The bottom panel is completely changed, together with the
fans.
The battery back-up is interrupted when the fan is changed (refer to the
appropriate section.
The cabinet must have cooling air slots if the subracks are not equipped with
fans.
Bus PC board
Ground
24 V electrical isolation
Power supply
sales@aotewell.com
Fault-free operation
Faulted operation;
or the subrack has no fan
SIMADYN D subrack
Industry Automation
Subracks
2
Permanent
connection
2-19
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