Siemens S7-400PLC Spécifications Page 399

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Cable duct and fan subassemblies
9.4 The 120/230 VAC fan subassembly (6ES7408-1TB00-0XA0)
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
399
CAUTION
Danger of damage to equipment.
If you mix up the power supply PCB and the monitoring PCB in the fan subassembly, the
fan subassembly may be damaged.
During maintenance of the unit, make sure you do not mix up the power supply PCB and
the monitoring PCB.
Monitoring function
In the case of a fault (defective fans) the fans are not switched off. Once you have replaced
the defective fan(s), the fault is acknowledged automatically as soon as the fans have
reached the required speed. Any faults that occur are not stored. When you switch on the
fan subassembly, the fans start running. After approximately 10 s the current status of the
fans is indicated via LEDs and relays.
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