7 Operation
EN
30
Rittal enclosure cooling unit
7.5.2
Configuration
The "Configuration" zone allows you to make basic set-
tings for the cooling unit under "Device configuration",
some of which can also be set directly on the display of
the device itself. The additional settings are briefly out-
lined below.
Device name
Name assigned to the cooling unit by the customer in or-
der to differentiate between multiple devices.
Alarm threshold
If the measured temperature is higher than the setpoint
plus the set temperature difference, an alarm message
(overtemperature) will be output. The table below shows
the range for the potential temperature difference (alarm
threshold).
The absolute temperature at which the "Overtempera-
ture" alarm message is output is therefore calculated as
follows:
– Limit temperature = Se alarm threshold
Example of "outlet temperature" control mode:
– Setpoint: 24 °C (75 °F)
– Alarm threshold (difference): 14 °C (25 °F)
– Limit temperature: 38 °C (100 °F)
Current situation:
– Temperature of air intake: 37 °C (< alarm limit)
– Temperature of expelled air: 24 °C (= setpoint)
If the alarm limit is exceeded:
– Temperature of air intake: 39 °C (> alarm limit)
– Temperature of expelled air: 22 °C (< setpoint)
If the alarm limit is subsequently undercut due to an in-
crease in the cooling output:
– Temperature of air intake: 37 °C (< alarm limit)
– Temperature of expelled air: 24 °C (= setpoint)
Alarm relay > switch logic
The switch logic of the relay output, i.e. whether it will be
used as a normally closed or normally open contact,
may be set here.
Assign alarm relay > System message(s)
Here, you can define which system messages should
switch the relay output.
From the list, activate the slide bar for those messages
which you would like to switch the relay output.
Filter mat > Filter reference
Here the device may be set permanently to operation
with filter mats.
If the device has already been set to operation with filter
mats, clicking on the "New filter mat" icon allows you to
reset the "Change filter mat" system message.
Filter mat > Alarm tolerance
Here, the alarm tolerance may be set to one of five lev-
els, or filter mat monitoring deactivated. If the set alarm
tolerance is exceeded, the system code "A03" appears
in the display.
Example:
– Setpoint: 35 °C (95 °F)
– External temperature: 20 °C (68 °F)
Note:
The Rittal Scan & Service app is largely intu-
itive to use, so we will only briefly consider
different app zones and the required set-
tings below.
Parameter
Alarm limit
Factory
setting
Internal temperature
Se
3 °C (5 °F)
…
Se
15 °C (27 °F)
Se
5 °C (9 °F)
External sensor
Outlet temperature
Se
12 °C (21 °F)
…
Se
24 °C (40 °F)
Se
14 °C (25 °F)
Tab. 6:
Alarm threshold
Note:
In "external sensor" and "outlet temperature"
control mode, the cooling unit additionally
monitors the temperature of the air as it is
drawn in. If the set alarm limit seems likely to
be exceeded (e.g. due to a rise in heat loss),
the cooling output is increased for the dura-
tion of the threatened overtemperature, and
the setpoint is undercut. The "External sen-
sor" control mode uses a fixed alarm thresh-
old of 50 °C (122 °F).
Note:
The factory setting of the relay output in its
connected operating state is "closed".
Note:
This message is also reset automatically as
soon as the device identifies an improved air
throughput in the external circuit thanks to
the use of a new filter mat. Assessment of the
air throughput only occurs when using the
compression system at constant speed, and
takes a few minutes.
