PROTEM
®
D 404
31
4.1 DIP-Switch S 502
By the DIP switch S502 you can select the respective input circuit (series or parallel resistors) of
each measuring input (refer to the following table).
I
II
III
IV
channel
Channel
1
2
3
4
5
6
7
8
switch number
ON
X
x
x
x
x
x
x
series resistor, PT100 sensor 1 "On"
OFF
X
x
x
x
x
x
x
series resistor, PT100 sensor 1 "Off"
I
x
ON
x
x
x
x
x
x
parallel resistor PT 100 sensor 1 "On"
x
OFF
x
x
x
x
x
x
parallel resistor PT 100 sensor 1 "Off"
x
X
ON
x
x
x
x
x
series resistor, PT100 sensor 2 "On"
x
X
OFF
x
x
x
x
x
series resistor, PT100 sensor 2 "Off"
II
x
X
x
ON
x
x
x
x
parallel resistor PT 100 sensor 2 "On"
x
X
x
OFF
x
x
x
x
parallel resistor PT 100 sensor 2 "Off"
x
X
x
x
ON
x
x
x
series resistor, PT100 sensor 3 "On"
x
X
x
x
OFF
x
x
x
series resistor, PT100 sensor 3 "Off"
III
x
X
x
x
x
ON
x
x
parallel resistor PT 100 sensor 3 "On"
x
X
x
x
x
OFF
x
x
parallel resistor PT 100 sensor 3 "Off"
x
X
x
x
x
x
ON
x
series resistor, PT100 sensor 4 "On"
x
X
x
x
x
x
OFF
x
series resistor, PT100 sensor 4 "Off"
IV
x
x
x
x
x
x
x
ON parallel resistor PT 100 sensor 4 "On"
x
x
x
x
x
x
x
OFF parallel resistor PT 100 sensor 4 "Off"
ON
switch in ON position
OFF switch in OFF position
x
switch position without effect
With the switch S 502 the user selects the corresponding input circuit for the respective sensor
(e.g.: adding a series resistor in PT100 operation). If several sensor inputs are connected in
parallel with one PT 100, at these inputs the resistors have to be switched off.
Example:
At sensor 1,2 and 3 a PT 100 (three wire type) and at sensor 4 no sensor, but a second relay
function for sensor 1 are connected. In this case the switch mode has to be like follows:
- Sensor 1 PT100
Switch 1 ON
Switch 2 OFF
- Sensor 2 PT 100
Switch 3 ON
Switch 4 OFF
- Sensor 3 PT 100
Switch 1 ON
Switch 2 OFF
- Sensor 4 parallel to sensor 1
(the terminals „2“ of sensor input 1 and „11“ of sensor input 4 have to be bridged)
Switch 1 OFF
Switch 2 OFF
