Siemens SINUMERIK 840D sl Manual page 30

Description
3.5 Dual fan/battery module
Additional information on the diagnostics buffer is provided in the Function Manual Basic
Functions, see PLC signal DB10 DBX109.6 (fan temperature alarm).
Fans
The temperature is sensed at several locations within the NCU. The fan is automatically
switched in when the temperature thresholds set in the factory are exceeded. A hysteresis
function prevents frequent fan start/stop operations.
If natural convection is not sufficient to ensure cooling of the NCU, the fans integrated in the
dual fan/battery module are switched on when required (except for an NCU 730.3B PN with
PLC 319-3 DP/PN, in this case, the fan runs continuously):
● After switching the NCU on, the fan is activated for a brief period of time (function test)
● The temperature is sensed at several locations within the NCU. The fan is automatically
Note
The NCU cannot be operated without fans, i.e. it will not power up if the dual fan/battery
module is not functioning. The RDY LED flashes red/orange with 0.5 Hz, all other LEDs light
up orange. The state can only be exited by switching the NCU off.
Battery
A 3 V lithium battery is installed in the dual fan/battery module; this can be replaced when
required. The battery is pre-assembled with an approximately 4 cm long cable with plug
connector. The appropriate mating connector is attached to a small circuit board for connection
in the dual fan/battery module.
Note
Please dispose of used batteries in the specially provided collection points on site. This will
ensure that the batteries are recycled in the correct manner or treated as special waste.
Note
The backup time of a used type of battery is at least 3 years. Exceeding this backup time
risks loss of data.
30
before turning itself off again.
switched in when the temperature thresholds set in the factory are exceeded. A hysteresis
function prevents frequent fan start/stop operations.
NCU 7x0.3 PN, NCU 7x0.3B PN
Manual, 06/2014, 6FC5397-1EP40-5BA1