5
Operation
Intelligent Power Supply KNX PS640-IP 2U
• Version: 21.09.2021 • Technical changes and errors excepted.
4.
Operation
In network installations,
KNX PS640-IP 2U
supplies one KNX TP line and monitors
all relevant data. With its default settings the
KNX PS640-IP 2U
operates as is sup-
posed to.
4.1. Device/Busline Diagnostics Application
Communication objects are used to request device status and measurement values.
The measured values can be sent after request, after a certain change (measured value,
device status) and periodically. Here, a certain change of the measured value means
the difference between actual value and last sent value. Number and duration of over-
loads are stored. The same applies for the number of short circuits, device startups,
KNX bus resets and for the duration of load detachments. The total operating time of
the device and its operating time since last device startup are stored, too. Threshold
values can be set for the bus voltage (only in the additional alarms), total current, tele-
gram traffic and internal device temperature. Regarding maximum current values and
maximum device temperature values, a tracking period can be set. At the end of every
tracking period the maximum measured value can be sent on the bus or just be set as
value of the appropriate object. Four different Alarm tabs (see chapter 6.7.) can be used
to send an info telegram (containing "0" or "1") about over/under threshold events and
to switch other devices. After assignment of the measurement source ("Output cur-
rent", "Device temperature", "Output Voltage") each alarm can be configured individu-
ally.
4.2. Diagnosis
The diagnostic measurement sources and event counters can be activated and deacti-
vated. When activated, the device monitors the relevant values.
4.2.1. Measurement Sources
The bus voltage, bus current and internal device temperature are measured constantly.
The telegram traffic extent is determined additionally. For each of these measurement
sources a threshold value can be set. After setting the threshold value the threshold
type can be selected (limit undercut/limit exceeded) and the behaviour on alarm acti-
vation/deactivation can be configured. A maximum value tracking feature with pre-set-
table tracking period can also be activated.
4.2.2. Event Counters
For diagnosis purpose, event counters provide number and duration of overloads.
When there is a short circuit on the bus, the load will be disconnected from the output
automatically. Number of short circuits and duration of load detachment are available
details. The same applies for the number of KNX bus resets and of device startups, and
for operating times. Additional alarms also provide the number of a value being in the
threshold range and the duration of such event.
