Toshiba Stereo Receiver RT318 User Manual

RT318  
8-channel RTD input  
Type  
RT318  
Category  
RTD ( Resistance Temperature Detector ) input  
Resistance temperature  
detectors  
Pt100  
Measuring method  
Load current  
Three-wire system  
1 mA  
-50 to +270 C (-58 to +518 F)  
Temperature measurement  
range  
°
°
°
°
Converted data  
800 to 4000  
Input channel  
Insulation  
8 channels / module  
Photo-coupler insulation (not isolated between the channels)  
400 ms / 8 channels  
Conversion rate  
Resolution  
12 bits / 0.025 % ( 0.1 C / count )  
°
Wire resistance correction  
range  
Within 4  
0.3 (at 25 C)  
Overall accuracy  
Tepaerature drift  
±
%
°
100 ppm / C  
±
°
Internal current consumption 5 Vdc, 600 mA or less  
10 M (500 Vdc)  
Insulation resistance  
Withstand voltage  
Weight  
500 Vac, 1 minutes ( between internal and external circuits)  
500 g  
Internal circuit  
Current source  
1 mA  
1 mA  
AMP  
1A  
1B  
1C  
1G  
ADC  
PC  
PC  
CH1  
CH8  
Rref  
Rref  
Wire break  
detection  
AG  
5 Vdc  
8A  
8B  
8C  
8G  
+15V  
-15V  
DC/DC  
0V  
AG  
PC : Photo-coupler  
1
 
RT318  
(1) Status indicator LEDs (PWR/FLT/RUN)  
1) PWR  
PWR will be lit in normal state of analog power supply, and will not be lit in abnormal state.  
2) FLT  
FLT will be lit if an error has occurred in the module.  
3) RUN  
RUN will be lit in normal state of the module, and will not be lit in abnormal state.  
Name  
PWR  
FLT  
Lit  
Not lit ○  
abnormal state  
Normal state  
abnormal state  
Normal state  
Error occurred  
Normal state  
(1)  
(2)  
RUN  
(2) Unused terminals  
(3) RTD input terminals (1A/1B/1C/1G to 8A/8B/8C/8G)  
These terminals will be connected with external RTD signals.  
(3)  
3
 
RT318  
How to wire  
Shielded twisted cable  
Internal circuit side  
nA  
RTD  
(Pt100)  
nB  
nC  
nG  
AG  
FG  
RTD  
:
Resistance  
Detector  
Temperature  
n
AG  
:
:
Channel number  
Analog ground  
FG : Frame ground  
If measurement values are unstable due to noise influences, change the grounding for  
the shield in the following order for stable measurement.  
Shielded twisted cable  
Internal circuit side  
nA  
(1)  
RTD  
nB  
nC  
nG  
(Pt100)  
AG  
FG  
(2)  
Shielded twisted cable  
Internal circuit side  
nA  
RTD  
(Pt100)  
nB  
nC  
nG  
AG  
FG  
Shielded twisted cable  
Internal circuit side  
nA  
(3)  
RTD  
nB  
nC  
nG  
(Pt100)  
AG  
FG  
Supplementary  
To minimize the influences of the wire resistance, be sure the wire  
length to be same of each cable from the terminal nA , nB or nC to  
RTD.  
4
 

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