Siemens SIPROTEC 7UM62 - Page 318

Functions
2.46 Temperature Detection by Thermoboxes
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
318
Furthermore, you can set an alarm temperature and a tripping temperature. Depending on the temperature unit
selected in the Power System Data (Section 2.4.2 in address 276 TEMP. UNIT), the alarm temperature can
be expressed in Celsius (°C) (address 9013 RTD 1 STAGE 1) or Fahrenheit (°F) (address 9014 RTD 1
STAGE 1). The tripping temperature is set at address 9015 RTD 1 STAGE 2 in degree Celsius (°C) or degree
Fahrenheit (°F) at address 9016 RTD 1 STAGE 2.
The settings for all temperature detectors connected are made accordingly:
RTD Box Settings
If temperature detectors are used with two-wire connection, the line resistance (for short-circuited temperature
detector) must be measured and adjusted. For this purpose, select mode 6 in the RTD-box and enter the re-
sistance value for the corresponding temperature detector (range 0 to 50.6 Ω). If a 3-wire connection is used,
no further settings are required to this end.
A baudrate of 9600 bits/s ensures communication. Parity is even. The factory setting of the bus number is 0.
Modifications at the RTD-box can be made in mode 7. The following convention applies:
Table 2-18 Setting the bus address at the RTD-box
Further information is provided in the operating manual of the RTD-box.
Processing Measured Values and Messages
The RTD box is visible in DIGSI as part of the 7UM62 protection devices, i.e. messages and measured values
appear in the configuration matrix just like those of internal functions, and can be masked and processed in the
same way. Messages and measured values can thus be forwarded to the integrated user-definable logic (CFC)
and linked as desired. But the pickup signals „RTD x St. 1 p.up“ and „RTD x St. 2 p.up“ are neither
included in the group alarms 501 „Relay PICKUP“ and 511 „Relay TRIP“ nor do they trigger a fault record.
If it is desired that a message should appear in the event buffer, a cross must be entered in the intersecting box
of column/row.
Mode Number of RTD-boxes Address
simplex 1 0
half duplex 1 1
half duplex 2 1. RTD-box: 1
2. RTD-box: 2