Output Attenuation Trimpot; Output Voltage Selection Jp1 - Homann Designs DC-03 User Manual

DigiSpeed-GX™
• LED Off – This indicates that there is no 5Vdc power supplied to the DigiSpeed-
GX™ .
• Lazy RED Double Flash – Indicates that the DigiSpeed-GX™ is powered on, and
there is no activity on the input source.
• Fast RED Flash – Indicates that the DigiSpeed-GX™ is powered, and there is
activity on the input source.
4.3

Output Attenuation Trimpot

The DigiSpeed-GX™ controller contains an Output Attenuation Trimpot. The purpose of
this is to attenuate or reduce the full scale output voltage of the controller. This may be
used to reduce the maximum speed of a spindle.
By turning the screw in the 11 turn trimpot VR1, in a Counter-Clockwise direction, the
output voltage will be reduced, or attenuated.
Some VFDs and motor controllers require a 0 – 5Vdc voltage to control spindle speed, yet
provide a 10Vdc voltage supply. In this instance, the attenuator may be used to reduce the
10V control voltage to 5V as required by the controller.
4.4

Output Voltage Selection JP1

Note: This jumper is only fitted when the optional DC-DC isolated voltage generator is fitted.
The DigiSpeed-GX™ controller contains an Output voltage selection jumper, JP1. The
purpose of this is to select the source of the isolated voltage that is generated.
If the jumper is fitted between pins 1-2 (towards the DC-DC generator) then the
Generators 15Vdc voltage will be used. In this instance there is no need to connect the
motor controller to pin AV+ on connector J2
If the jumper is fitted between pins 2-3 (away from the DC-DC generator) then the voltage
supplied by the DC motor controller via connector J2, pin AV+ will be used.
Copyright 2006 ©
- Users Guide
Homann Designs
Page 11
Revision 0.1