Siemens SIDOOR AT40 System Manual page 261

Function
The SIDOOR NT40 is a 230 V AC (± 15 %) 50 / 60 Hz power supply unit for supplying
SIDOOR controllers for door weights up to 600 kg.
On the output side, the switch mode power supply supplies a 36 V DC (± 3 %) SELV at a
rated output power < 100 W. The device can briefly (< 2 s) deliver a 15 A current to enable
fast acceleration (corresponds to a brief power output of 540 W).
Short-circuit protection
Output X2 is short-circuit proof.
LED display
LED L1 indicates the presence of the output voltage.
Note
If the LED does not light up despite being correctly connected to the X1 supply line and if
there is no measurable output voltage, this indicates a short circuit on the output side or a
defective module!
The device can be operated by the controller without load to establish whether the module is
defective. If the LED at the output does not light up in this mode of operation, and there is no
measurable voltage at the output, this indicates that the device is defective!
AT40, ATD400V, ATD400K, ATD4xxW, ATD400S, ATE250S, ATD400T
System Manual, 06/2016, A2B00096162-AN
Power supply
8.1 SIDOOR NT40
261