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8
Operation
Intelligent Power Supply KNX PS640-IP 2U
• Version: 21.09.2021 • Technical changes and errors excepted.
4.5. KNX Bus Reset Function
During a bus reset, the device disconnects the entire bus line from the supplying out-
put and induces a short circuit for 20 seconds. LED 6 (KNX Bus Reset) lights up red and
goes off after the reset process is accomplished. Other LEDs are off. The devices con-
nected to the bus line restart during the reset process.
Bus Reset and Device Startup:
•
Reset by push-button:
The Reset Button activates the KNX Bus Reset function. Press the Reset Button
on top of the device to reset the KNX bus line
•
Reset by object:
A remote reset can be triggered by communication object no.16
•
Reset by disconnection:
Removing the KNX bus terminals disconnects the entire bus line
•
ETS programming:
When there was a mains power outage or after an ETS download, the
KNX
PS640-IP 2U
counts a device startup
A "KNX Bus Reset" is triggered after a reset by button press and after a reset by com-
munication object. A "Device Startup" takes place when there was a mains power out-
age or after programming the device. The number of "Short circuits" is counted only
by the counter that can be read out with communication object no.36 "Power supply is
on".
Fig. 1: ETS Properties Window