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The VSI (Voltage Signal Isolator) permits the user the ability of inputing any DC signal (grounded or ungrounded)into a speed control without being concerned about whether that signal is isolated from ground, or not. A single model accepts a wide range of input voltages (0-5 through 0-25VDC o 0-25 through 0-250 VDC). The GAIN trimpot is used to adjust the output of the VSI to full on when a full speed signal is applied to its input terminals. The VSI incorporates Dart's patented feedback circuit, which virtually eliminates output changes due to the thermal drift of logic components. The VSI is packaged in an aluminum chassis mount housing and contains an on board power supply for its logic circuit. An electical isolation rating of 2500Vrms is achieved by the use of an optically isolated Integrated Circuit.

The Dart VSI can be used with virtually any motor speed control that has a speed reference circuit of +5 to +15 VDC and an input impedence of greater than 47K ohms. The out put of the VSI is a filtered, pulse width modulated signal that is directly proporional to the input speed signal. The wide input range allows the VSI to follow signals as low as +0 - +5V logic levels and up to 180VDC levels present at the armature of a 180VDC motor. By simply connecting the input terminals across the armature leads of a "master motor", you can use the VSI for a master/follower operation. The addition of a scaling pot will provide for proportional follower operation.

By adding a resistor across signal input, VSI can fuction as a Current Signal Isolator.

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