ENGLISH
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Controller board
(-) (+)
- Place at DC30mA
- Measurement shall
be between
4~20mA
- Place at DC30mA
- Measurement shall
be between
4~20mA
(-) (+)
(-)
(+)
(-) (+)
(-) (+)
Current sensor
Current sensor
Digital input signal is not checked by the controller.
If the no voltage contact signal is properly input to the digital input of the controller but controller finds it as abnormal
or if there is no change of all digital input signals, it is because of the defective connection of I/O board power con-
nector or no communication between I/O board and main board.
Check communication line connection status between I/O board and main board, and it there is no problem, short-cir-
cuit the connector of the wiring among the controller digital inputs that does not work to COM connector (23, 24) of
controller I/O board to check whether LED LAMP corresponding to the I/O board input connector is lighted.
Select “menu key” – “system information” – “I/O input” of the controller display, short-circuit/open abnormal con-
nectors and COM connector to see if input status changes to “ON”/”OFF”.
When DC voltage between COM connector of the controller digital input and the wire released digital input, check if
18V is measured.
If there is no problem, connect them again and check operation.
If the corresponding board main power and communication is normal and I/O input still does not work the board
needs to be replaced.
Check by referring to the below flow chart and tester connection diagram.
Figure 99. Pressure sensor
Figure 100. Current sensor measurement circuit