Stagehand Mini
2
Manual
Page 16
Figure 13
Now let’s take a look at the encoder signals:
Speed Encoder (optional) – a set of quadrature signals that can used by the Variable Frequency Drive
(VFD) to accurately regulate speed. Internally, the Stagehand Mini
2
does not use the Speed Encoder but
the pins are available to use if you have a VFD (or other amplifier) that can use the signal for tighter
speed regulation.
Position Encoder – a set of quadrature signals used by the motion controller to drive the motor to
correct positions on cue. This encoder may be the same as the Speed Encoder or it may be a separate
encoder. For instance, a scissor lift that is driven by a variable‐speed pump needs a speed encoder on
the pump motor, but the positioning encoder should be placed directly on the lift platform since
relationship between the motor rotation and platform position changes depending on the extension
height of the lift as it raises and lowers. A deck winch however, can use a single encoder mounted on
the motor for both speed and positioning.
As mentioned above, you can use either a single encoder mounted to the motor for both Speed and Position
Encoder signals, or separate encoders mounted in different locations on the machine. Below are two drawings
that show how to wire your encoder signals in both scenarios:
