Sices HS 315, Technical Handbook

Page: 74 / 255

56 Technical Handbook
JP-2
Voltage input for the
measurement of the
compensation resistance. Input for compensation
resistance
JP-3
Current injection point
–
voltage input for the
measurement of the PT100
resistance.
Thermo-resistance input
The HS315 accepts a PT100 temperature sensor with 2 or 3 wire connection. For the
connections, it is recommended to use shielded cables. The measurement input is of the non-
isolated type.
2-wire connection: for short-distance connection (<10m) between HS315 and the sensor. It
should be noted that this connection introduces an error equal to the resistance of the
connecting cables. Connect the PT100 between pins 1 and 3 of JP; it is necessary to bridge
the pins 1 and 2 of the JP connector to avoid using the resistance compensation of the
connecting cable.
3-wire connection: connection to be used for medium to long distances (> 10 m) between the
HS315 and the sensor. Connect the PT100 between JP pins 1 and 3 and connect the third
compensation wire to JP pin 2.
The controller automatically compensates the resistance of the connecting cables. For this
compensation to be correct, the resistance of each wire must be the same, because the
controller measures the resistance of a wire and assumes that the resistance of the other wire
s is the same.