Subracks
Hardware - SIMADYN D
2-19
Edition 04.2011
2
2.2.5 Ventilation/cooling
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:
Fault-free operation
Relay contact open :
Faulted operation;
or the subrack has no fan
!
WARNING
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.
2.2.6 Mounting
guidelines and noise immunity
Bus PC board
Ground
Permanent
connection
24 V electrical isolation
Power supply
SIMADYN D subrack
Fan monitoring
Fan change
Self-convection
Ground
connections
Aotewell Ltd
www.aotewell.com
Industry Automation
HongKong|UK|China
+86-755-8660-6182
