Siemens Siprotec 7UM611 Manual page 66

2 Functions
address 1607 is set to Disabled. The allocation between the input signal and the
temperature can be set at address 1608 (in °C) or 1609 (in °F) TEMP. SCAL.. For
this the temperature value set here corresponds to the 100% value from Profibus DP.
In the default setting, 100% (field bus) correspond to 100°C.
If under address 1607 TEMP. INPUT the temperature setting of RTD 1 selected, the
scaling under address1608 or 1609 is ineffective. The works setting can be left as it is.
If the ambient temperature detection is used, the user must be aware that the K-
FACTOR to be set refers to an ambient temperature of 104.00 °F or 40 °C, i.e. it corre-
sponds to the maximum permissible current at a temperature of 104.00 °F or 40 °C.
All calculations are performed with standardized quantities. The ambient temperature
must also be standardized. The temperature at nominal machine current is used as
standardization value. If the nominal machine current deviates from the nominal CT
current, the temperature must be adapted according to the following formula. At
address 1605 or 1606 TEMP. RISE I the temperature adapted to the nominal trans-
former current is set. This setting value is used as standardization quantity of the
ambient temperature input.
with
Θ
Θ
I
I
If the temperature input is not used, the address 1607 TEMP. INPUT is to be set to
Disabled . In this case, the settings of the addresses1605 or 1606 and 1608 or
1609 are not considered.
66
Machine Temperature with Secondary Nominal Current = Setting at
Nsec
the 7UM61 (address 1605 or 1606)
Machine Temperature with Nominal Machine Current
NMach
Nominal primary CT current
Nprim
Nominal Current of the Machine
NMach
7UM61 Manual
C53000-G1176-C127-3