ATR243-20ABC analog input-output
Posted: 28/12/2016, 19:26
Hello,
We wanted to use the controller as a remote control to the Frequency Converter (FC).
First of all,an operator should to monitor the actual pressure value. The pressure transmitter (4-20mA) is connected to the FC,and the current is retransmitted by FC to the ATR243-20ABC via input terminals N1 & N2 and monitored by the green LED indicator.
The desired pressure is set by operator and indicated by the red LED indicator. Corresponding current (4-20mA) is sent back to the FC via output terminals N4 & N5.
Common Ground bus is hardwired in the FC to all the analog inputs & outputs. Thus,controller's terminals N2 (input, negative) & N4(output, negative) are connected to the same COM GND bus in the FC .
If the only analog input (N1 & N2) is connected to the FC, we read a correct pressure value on the indicator. If the only analog output (N4 & N5) is connected to the FC, we got a correct current to the FC.
A problem appears, if BOTH input & output are connected to the FC. Warning E-05 on the display.
It seems to me, it's not allowed to operate shared terminals (N2 & N4) on this controller? How to solve this problem?
We wanted to use the controller as a remote control to the Frequency Converter (FC).
First of all,an operator should to monitor the actual pressure value. The pressure transmitter (4-20mA) is connected to the FC,and the current is retransmitted by FC to the ATR243-20ABC via input terminals N1 & N2 and monitored by the green LED indicator.
The desired pressure is set by operator and indicated by the red LED indicator. Corresponding current (4-20mA) is sent back to the FC via output terminals N4 & N5.
Common Ground bus is hardwired in the FC to all the analog inputs & outputs. Thus,controller's terminals N2 (input, negative) & N4(output, negative) are connected to the same COM GND bus in the FC .
If the only analog input (N1 & N2) is connected to the FC, we read a correct pressure value on the indicator. If the only analog output (N4 & N5) is connected to the FC, we got a correct current to the FC.
A problem appears, if BOTH input & output are connected to the FC. Warning E-05 on the display.
It seems to me, it's not allowed to operate shared terminals (N2 & N4) on this controller? How to solve this problem?