Use
Buildings
•
Office and administrative buildings, residential housing.
•
Schools, gymnasiums, leisure facilities, hotels.
•
Municipal buildings, industrial buildings.
•
Building maintenance companies, facility management.
Building operators
•
Real estate agencies.
•
District heating companies, installers, end customers.
Functions
Basic functions
Basic functions of the central communication unit OZW775:
•
Monitor KNX network member devices and acquire fault statuses in HVAC plants via
digital and universal inputs.
•
Signal faults via direct connection to local operator station and/or via modem to
operator stations, SMS recipients, pagers, fax machines, email recipients.
•
Central communication unit V2.0 with web server: Send faults to web browser via
Ethernet and/or direct connection or modem.
•
Operate HVAC plants and equipment with operator stations and/or web browser, and
display process values on operator stations and/or web browser.
•
Function "Clock time master" for default system time (date and time) to KNX network
member devices.
•
Function "System clock" with adjustable time zone and daylight saving/standard time
changeover.
Faults
•
"System" fault source
The central communication unit detects device failures and faults on the KNX
network listed in the unit’s device list.
Fault sources
•
"Local" fault source
The central communication unit identifies internal faults and fault states at the digital
and universal inputs configured as fault inputs (fault source "Local"). Typical faults at
digital and universal inputs:
−
Overload signals from thermal cutouts.
−
Error states signaled by switches or monitors.
−
Limit value violations.
−
Fault states of aggregates and plants.
−
Common messages from external plants.
Fault indication
Depending on the fault's source, the central communication unit indicates faults either
via "Local" or "System" LED. The "Local" LED also indicates state "Hours run for
service reached".
You can configure two relay outputs as fault relays. As a result, faults can be indicated
by optical or acoustic alarm equipment in addition to LEDs.
Fault relays
Faults can also be sent as text messages via PC or modem interface. For messages
via modem, both the number of repetitions and the modem message interval can be
parameterized.
Fault status message
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Building Technologies
Central communication unit OZW775 V2.0
CE1N5663en
HVAC Products
29.10.2008
