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Brand advantage: Allen Bradley, BentlyNevada, ABB, Emerson Ovation, Honeywell DCS, Rockwell ICS Triplex, FOXBORO, Schneider PLC, GE Fanuc, Motorola, HIMA, TRICONEX, Prosoft etc. Various kinds of imported industrial parts

REF601 CE446BB1NH control panel

Equipment Required · DC signal source with a range from -10 VDC to +10 VDC @ 10 mA minimum and with an accuracy and resolution of better than 100 mVDC. · Potentiometer adjustment tool. · Phillips screwdriver · I/O module extender, catalog number T3322 (recommended). · PC running the WINTERPRET software, used to monitor the analog input channel values during calibration.

Calibration Preparation The module must be calibrated while connected to an I/O chassis of an operational Regent system. During calibration, the analog input module will be disconnected from the actual field devices. Appropriate precautions should be taken to ensure that the disconnection of the field sensors does not pose a safety risk to plant personnel or process equipment. There are Offset, Gain and CMR (Common Mode Rejection) potentiometers that are common to all of the analog input channels. These potentiometers are located on the front of the analog input PCB (see Figure 19). During the calibration procedure the Offset and Gain potentiometers will be adjusted. The CMR potentiometer is factory adjusted and does not require adjustment in the field.

Calibration Methods 

Calibrating the analog input module requires that you connect calibration voltages to all of the analog input channels of the module and adjust the trimming potentiometers until the analog inputs read the correct calibration values. During calibration the module must be installed in a Regent system and disconnected from the field signal wiring while the calibration voltages are connected to the module input signals. There are three trimming potentiometers which are accessible through the front face of the module making calibration adjustments possible without opening the module’s cover. However, the corresponding field wiring will have to be disconnected from the I/O chassis terminals. If you do not wish to disturb the field wiring during calibration, the I/O Extender module (catalog T3322), can be used. With the analog input module PCB removed from the module housing and plugged into the I/O extender module, you can connect the calibration voltages to the I/O extender module and leave the analog input field wiring in place. This is the recommended method for calibrating the analog inputs. and is described below in the calibration procedure.