CT-600-2
13
Alarms & Warnings
The alarms & warnings screen “Alarms” shows a table with the active alarms. The top of the screen shows
buttons to see alarm history and active warnings. On the screen that shows the warnings there is a similar
button to go to the screen for the warning history. It is possible to manually reset alarms, when logged in to
the system.
Trends
The trends page “Trends” gives the user the possibility to see trend data for certain signals. The trend pages
show the actual value and some period back in time, but also offer the possibility to look further into historical
trend data.
Service
The service page “Service” is used to setup the communication between the modules, change language,
units, time, etc. The page also links to an event log, operating hours and information about the software
versions.
Parameters
The parameter page “Param.” is made up of different screens to set up all the relevant parameters and timer
values that are needed to configure and operate the system. The parameters and timers are collected in
different groups.
5.3
ACP LINK main functions overview
The many functions of the ACP LINK can be sorted in different groups:
I/O signals data processing
The different signals for sensor and actuators are communicated to the ACP LINK panel through a Modbus
RTU connection. Various other related signals that are not measured directly, are then derived to be used in
the different functions.
A set of signals, including the status for all alarms and warnings are shared for communication to a SCADA
system via Modbus TCP/IP. See section 15 for a complete list of all signals and register addresses, available
on Modbus TCP/IP.
Diagnosis and redundancy
A diagnosis of possible signal errors, primarily high/low values is performed and a warning will be issued if a
possible bad signal is detected. If a bad signal is diagnosed and there is an alternative signal available, then
the redundancy function will point the alternative signal to take over for the bad signal. The redundant signal
may be from another sensor or may also be a derived signal, possible of lower quality than the original
signal.
The intention of the diagnosis and redundancy functions is to assure continuous operation of the ACP, even
in case of sensor errors. It shall be possible to correct the defect, while the ACP can continue to operate.
Depending on the type of defect, operation may continue unrestricted, or limited in some way. In the latter
case a warning will indicate that.
Protections
The ACP LINK protects the ACP and its components from incorrect operation and shall prevent wear and
breakdown. The different protection functions test certain signals up against limits and will issue a warning
and or alarm if limits are exceeded. In some cases timers are incorporated in the protection algorithm. The
protection function itself will only issue a warning or an alarm. The counter action, such as to stop a
compressor, is handled through the alarm handling and control functions.
