ABB 3HNA009326-001 FAN UNIT

Detailed

ABB 3HNA009326-001 FAN UNIT

When used without signal conditioning input boards, the 3HNA009326-001 provides direct full scale input ranges from ±250 mV to ±10 V. The optimum input filter for these applications is the 50 Hz filter, although the 10 Hz filter will provide improved attenuation of power line frequency interference at the expense of decreased common-mode rejection. To minimize the effects of direct input multiplexing, the inputs on the 3HNA009326-001 are buffered using op-amps. The buffers supply a constant low impedance to the Programmable Gain Amplifier (PGA) regardless of the varying source impedance. Use the lowest input gain and the largest block size (refer to Chapter 3 “Programming”) that are practical for the application. If inputs are obtained directly from remote sources, the grounding scheme used can have a major effect on system performance. Each system has its own unique interference considerations, but the following general guidelines will apply in most cases. 

Long Input Lines: Long input lines (greater than 10 feet), or inputs from grounded sources (sources which are not floating), should be connected to differential inputs, and overall shields should be extended from the input sources to as close to the board as possible. Single-ended inputs are susceptible to ground loop errors, and should be used only with high-level floating sources

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