Micom P634 - Input for Connection of a Resistance Thermometer

Q9Z5029A
MEASI:
Scaled value IDC,lin
[ 004 180 ]
MEASI:
Scaled val. IDC,lin1
[ 037 192 ]
MEASI:
Curr. IDC,lin. p.u.
[ 004 136 ]
MEASI:
Scaled val.IDC,lin20
[ 037 193 ]
Fig. 3-27: Scaling of the linearized measured value.
3.8.1.1 Zero Suppression
Zero suppression is defined by setting MEASI: Enable IDC p.u. If the direct
current does not exceed the set threshold, the per-unit input current I
DC p.u.
and
the current I
DC,lin
will be displayed as having a value of “0”.
3.8.1.2 Open-Circuit and Overload Monitoring
The P634 is equipped with an open-circuit monitoring function. If current I
DC
falls
below the set threshold MEASI: IDC< open circuit, the signal MEASI: Open
circ. 20mA inp. is issued.
The input current is monitored in order to protect the 20 mA analog input against
overloading. If it exceeds the set threshold of 24.8 mA, the signal
MEASI: Overload 20mA input is issued.
3.8.2 Input for Connection of a Resistance Thermometer
This input is designed to connect a PT 100 resistance thermometer. The mapping
curve, R = f(T), of PT 100 resistance thermometers is defined in the IEC 751
standard. If the PT 100 resistance thermometer is connected using the 3-wire
method, then no further calibration is required.
Open-Circuit Monitoring
If there is an open measuring circuit due to a broken wire, the signal
SFMON: PT100 open circuit is issued.
Maximum Temperature Value Since the Last Reset
The result of a temperature measurement cannot only be read out as a direct
measured value (temperature T) or as a normalized value (temperature norm. T),
but also as the maximum value since the last reset (temperature Tmax).
For this the following menu points are available:
●
MEASI: Temperature Tmax (maximum temperature value)
●
MEASI: Reset Tmax EXT (reset via a binary signal)
●
MEASI: Reset Tmax USER (manual reset)
3 Operation
P634
P634/EN M/R-42-A // P634‑311‑653 3-43