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then again when they become inactive or are acknowledged. Errors are alarms
that concern the internal workings of the control computer. A system restart is
an example of an occurrence that is noted as an event in the alarm history. It is
thus possible to see whether there has been a power failure.
3�4 Operation mode
In the menu Operation mode, the heat pump and the whole plant, or parts of
it, can be turned off and on. The heat pump mode should normally be set to
Auto, but can also be set to Standby, Only Heat, or Only Hotwater.
If it is the master heat pump, similar settings are available for the master func-
tionality, along with settings to inactivate expansion modules.
3�5 Information
The menu Information has several sub menus with different types of informa-
tion about the status of the system. Under Temperatures all measured tempe-
ratures are listed, as well as some calculated temperatures and integral values.
Exactly what is in this list depends on the configuration.
Operation mode lists status information about the heat pump and the rest of
the system. Under Running time run time information is found.
Under Databases the values stored in databases are listed. First select one ca-
tegory and press Ok, then select a value. Press Ok to display a graphical plot
showing how the value has changed in recent time. The seconds category con-
tains values that changes fast, like shunt signals. The last 20 minutes of history
can be viewed. Minutes displays temperatures and signals that changes more
slowly. One value is saved every minute, and the last 24 hours can be seen.
Hours saves one value every hour and the history of the last thirty days can be
seen. Hours Mean, Max and Mean are similar, but do not store instant values
but the mean value, highest and lowest values of the hour respectively.
The database plot is shown with current time at the rightmost position. The x
axis has a fixed scaling and the y axis is auto scaled to fit the data. The grid and
labels can be hidden to not obscure the plot by pressing the down key.
3�6 settings
The menu Settings has sub menus with settings for different parts of the sys-
tem. In a slave pump controller there are only heat pump settings, but the
master has much more. These settings are briefly explained below.
Danfoss – 21
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