7.2 Fan/battery module
7.2.1 Cooling SIMOTION D4x5 and buffering data
Functions of a fan/battery module
The fan/battery module has the following tasks:
● CPU cooling
● Buffering of the SRAM and the real-time clock if the SuperCap is insufficient.
The Control Unit monitors the temperature and the functioning of the fan.
Cooling the SIMOTION D4x5
If there is insufficient free convection for heat dissipation of the Control Unit and the supply air 
temperature rises above the permitted range, an external fan/battery module must be fitted to 
the bottom of the D4x5. This module can be installed without further measures on a Control 
Unit where there is insufficient ventilation in the control cabinet.
Table 7-1 Fan/battery module for SIMOTION D4x5
Characteristi
c
SIMOTION 
D425
SIMOTION D435 SIMOTION 
D445
SIMOTION D445‑1
Fan/
battery 
module
Optional D435 with order no. 
6AU1 435-0AA00-0AA1
: optional 
-----------------------------
D435 with order no. 
6AU1 435-0AA00-0AA0
:
with supply air 
temperature 
of 43° C or 
above
Always required 
(included in the 
D445's scope of 
delivery)
Always required 
(double fan/
battery module 
included in the 
D445-1's scope of 
delivery)
Compatible 
fan/
battery 
modules
Fan/
battery module 
(single fan)
Fan/battery module 
(single fan)
Fan/battery 
module (single 
fan)
Double fan/
battery module 
Fan/battery module 
(single fan) 
Max. 
permissible 
supply air 
temperature
55 °C 55° C 55° C 55° C
Fan control Switches on at 
supply air 
temperatures of 
approx. 
43° C or 
above
Switches on when 
supply air temperature 
of approx. 43° C above
Fan is always on Temperature-
controlled fan; 
activated when 
required and runs 
constantly at supply 
air temperatures of 
approx. 40° C or above
Supplementary system components
7.2 Fan/battery module
SIMOTION D4x5
Manual, 04/2014 83