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MN1373

Chapter 1

Introduction

Introduction

The BC145 Signal Isolator is used to isolate, amplify and condition DC voltage and current signals from any source (motors,

tachs and transducers) which will provide most adjustable speed motor controls with a voltage following input. The

maximum output voltage of the isolator is 10 volts which is a linear function of the input signal.

The BC145 is versatile since it can accommodate a wide range of input voltages (0-25*, 0-120 and 0-550VDC) and, in

addition, a wide range of input current signals (4-20mA, 10-50mA and 1-5mA). The Voltage/Current (“VLT/CUR”) jumper is

used to change the BC145 from a voltage to current input.

BC145 is a unipolar input, providing 0-10V input. For Regenerative Drives with bipolar ±10V input, other Signal Isolators are

available.

A built-in power supply enables the BC145 to be controlled with a 5KΩ remote potentiometer (connect potentiometer to

terminals “P1”, “5” and “6”). The potentiometer can also be wired for Auto/Manual Operation.

*The input range of 0-25V is the maximum voltage that can be applied to terminals “5” and “6”. The minimum input voltage

is 0-5 volts which can achieve an output voltage of 0-10 volts. The unit is factory calibrated so that a 0-10VDC input yields a

0-10VDC output.

SAFETY NOTICE

A Warning statement indicates a potentially hazardous situation which, if not avoided, could result in injury or death.

A Caution statement indicates a potentially hazardous situation which, if not avoided, could result in damage to property.

A Note indicates additional information that is not critical to the installation or operation.

WARNING: This equipment may contain voltages as high as 1000 volts! Electrical shock can cause serious or fatal injury. Only qualified

personnel should attempt the start-up procedure or troubleshoot this equipment.

WARNING: Be sure the system is properly grounded before applying power. Do not apply AC power before you ensure that all grounding

instructions have been followed. Electrical shock can cause serious or fatal injury.