ShopBot PRS Assembly Manual Page -50
Hooking Up to the Control Box
Do’s and Don’ts
DO contract with a licensed electrician experienced with industrial equipment to
wire the power to the PRSalpha control box, a spindle/VFD and for a displacement
or regenerative vacuum blower system for hold-down. Documentation provided with
spindles and blowers details their power requirements.
DON’T plug in or unplug motors or motor cables when the control box is on.
DON’T disconnect the motor, or the motor cable at the junction in the Control Box,
without first turning off and unplugging the control box. The Control Box for your
new ShopBot contains integrated circuit components for driving your stepper motors
('drivers' for short). These drivers are at the heart of the performance capabilities of your
tool. Each one has sophisticated logic circuitry for micro-stepping as well as current handling
paths that control and rapidly switch four output lines that each deliver up to 60 volts at 2
amps to the motors of your tool. Each chip programs the output to the coils of your stepper
motors, regulates the actual currents that flow on a micro-second basis, and moves your
stepper motors at up to several thousand steps per second. Despite their current handling
capabilities, these chips can be vulnerable to the large voltage spike that occurs if the drive
is disconnected under load.
DON’Tt push the tool manually with the motors plugged into the driver but powered off.
The motors will send currents back into the drivers. Use the software keypad control of your
ShopBot which gives you convenient, full-movement capability. If you need to move the tool
manually for a set-up or maintenance task, shut down and unplug the control box, then
disconnect the motors before pushing the carriages.
DO use instructions for either the PRSalpha or the PRSstandard – whichever one
you have.
PRSAssembly080922.doc Copyright 2007,2008 ShopBot Tools, Inc
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