Functions
272
7UM62 Manual
C53000-G1176-C149-3
The location RTD1 is communicated to the device at address
. Setting options are
and
. This set-
ting is only possible with DIGSI
®
4 under “Advanced Parameters”.
You can also set an alarm temperature and a tripping temperature. Depending on the
temperature unit selected in the power system data (Section 2.3 at address
), you can select the alarm temperature at address
in degree Celsius (°C) or at address
in degree Fahrenheit
(°F). The tripping temperature is set at address
in degree
Celsius (°C) or at address
in degree Fahrenheit (°F).
In the same way, you can make the settings for all connected temperature detectors
(see the settings table in 2.42.2.1).
Settings on the
Thermobox
Where temperature detectors with a 2-wire line are used, the line resistance must be
measured and set (with the temperature detector shorted). To do so, select mode 6 in
the thermobox and enter the resistance value for the desired detector (range 0 to
50.6
Ω
). For temperature detectors with a 3-wire line, no extra settings are required.
The information is exchanged with a baud rate of 9600 bits/s. The parity is even. The
bus number is set to 0 in the factory. Changes can be made in mode 7 on the ther-
mobox. The following convention applies:
More information can be found in the operating instructions supplied with the ther-
mobox.
Further Processing
of Measured Values
and Indications
The thermobox is seen in DIGSI
®
4 as part of the 7UM62 protection device, i.e. indi-
cations and measured values appear in the configuration matrix just like those of in-
ternal functions, and can be masked and processed in the same way. This means that
indications and measured values can also be transmitted to the integrated user-defin-
abled logic (CFC) and linked in any desired way.
If you want an indication to appear in the operational indication buffer, mark the matrix
cell at the appropriate column/line intersection with a cross.
Table 2-18
Setting the Bus Address on the Thermobox
Operation
Number of Thermoboxes
Address
Simplex
1
0
Half-duplex
1
1
Half-duplex
2
1st thermobox: 1
2nd thermobox: 2
