Using Powered Voltage and Current Transducers with Dual Channel ModulesHardware: FieldPoint>>Dual-Channel Modules>>FP-AI-C420, FieldPoint>>Dual-Channel Modules>>FP-AI-V50m, FieldPoint>>Dual-Channel Modules>>FP-AI-C020, FieldPoint>>Dual-Channel Modules>>FP-AI-V5B, FieldPoint>>Dual-Channel Modules>>FP-AI-V100m, FieldPoint>>Dual-Channel Modules>>FP-AI-V10, FieldPoint>>Dual-Channel Modules>>FP-AI-V10B, FieldPoint>>Dual-Channel Modules>>FP-AI-V5, FieldPoint>>Dual-Channel Modules>>FP-AI-V1
Problem: Can I use voltage and current transducers that require excitation with my dual channel modules, and if so, can I use the FieldPoint controller's power supply to power these transducers? Solution: You can use powered voltage and current transducers with dual channel modules, but there are certain considerations to keep in mind. In the case of differential, wire up the transducer by connecting the (+) and (-) leads of the voltage/current to be measured to the (a) and (b) terminals (respectively) of a SINGLE channel. To achieve true channel to channel isolation, you can use only one channel of each dual channel module. For single ended connections, you can use both channels. Either a separate power supply or the controller's power supply can be used to provide your transducer with excitation. However, the output of most powered transducers is directly dependent upon the excitation that it is being supplied with. For example, a 24 V excitation voltage will usually result in a transducer outputting voltages in excess of 10 V. If your dual channel module is only capable of reading voltages up to 5 V, you will damage the module. The PS-2 power supply (commonly used to power FieldPoint controllers) is rated at 24 VDC. In this case, the controller's power supply would not be a good excitation source. Once you have obtained a power supply that can be safely used with your powered transducers, you can connect the (+) and (-) leads of the power supply to any of the (V) and (C) terminals of the TB-10. All of these terminals are connected internally and are isolated from the channel inputs. Finally, you can connect the (+) and (-) excitation leads of the transducer to any of the (V) and (C) terminals across the TB-10. Related Links: KnowledgeBase 3278PSX8: How Do I Use My FieldPoint Analog Input Dual Channel Modules in Differential Mode? Attachments:
Report Date: 06/04/2004 Last Updated: 06/14/2004 Document ID: 3A3CKHQ8 |
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