Handling ±10V command reference
|The industry standard for analog command reference signals has been for many years: ±10V. However, today's microprocessors
are operating with below 5V supply, with the trend to reduce voltage levels even more. Due to this fact, the motion controller
manufacturers are forced to add an operational amplifier at the output of their D/A and to require ±12V supplies to operate
it. This is not a logical approach anymore and it increases circuit complexity and cost.
By anticipating the above described trend, Elmo Motion Control
decided to design the new VIO
amplifiers with a standard ±3.75V command reference input. This does not mean that there is any limit whatsoever to connect
any of the amplifiers (VIO/PIC/FLU) to a ±10V command. All that is required is to connect two 33Kohm external resistors
to the amplifier inputs.
Also, most of the motion controllers have a software feature that allow them to adjust the output voltage but it usually
comes on the account of the output resolution. If this is the case with your controller, DO NOT use this feature and apply
the following circuit.