neerajpuranik
Member
Dear Friends,
We are commissioning Siemens S7-400 series PLC with analog output module 432-1HF00-0AB0. I am attaching the schematic. The problem is when we are connecting it to control valve it is not operating although we are getting 4-20mA from AO card. On further checking we found that in open loop the voltage in the output is 18 V & current 20mA but when we connect to I/P converter the voltage drops to 5.1V, currents remains at 20mA (at 100% Set Point). At 0% SP it is 1.6V. We have tried making Negative & earth common but there is no change. Can any body give any suggestion?
Regards,
Neeraj
We are commissioning Siemens S7-400 series PLC with analog output module 432-1HF00-0AB0. I am attaching the schematic. The problem is when we are connecting it to control valve it is not operating although we are getting 4-20mA from AO card. On further checking we found that in open loop the voltage in the output is 18 V & current 20mA but when we connect to I/P converter the voltage drops to 5.1V, currents remains at 20mA (at 100% Set Point). At 0% SP it is 1.6V. We have tried making Negative & earth common but there is no change. Can any body give any suggestion?
Regards,
Neeraj