GETTING STARTED
The premise of GRIT Lock is simple: easily lock/unlock tools to increase shop safety. With
the use of GRIT Triggers, we are able to not only control the power that reaches your tool,
but also, measure the current draw of the machine. Beyond the lock/unlock capability, the
system provides an additional safety feature: Emergency Lock. Understanding how GRIT
Lock® works and how to fine tune the power profile configuration of each tool/Trigger will
ensure the proper current measurement to detect when a tool is running, as well as,
optimal response time in the event of an Emergency Lock situation.
Emergency Lock
One of our safety "policies" is that GRIT will NEVER turn off a tool that is running. In the
event that the HUB goes offline, someone initiates a system update, or someone is running
a tool after the HUB's scheduled lock time, GRIT NEVER CUTS POWER TO A RUNNING
TOOL.
An Emergency Lock, or an instance when GRIT will cut power to a tool, is described in the
following scenario:
GRIT quickly cuts power to tools left in the 'ON' position prior to that tool's Trigger being
unlocked.
Example: The entire shop is locked. Person 'A' walks up to the bandsaw and flips the
power switch 'ON'. Since the tool is locked, it will not power on. Mistakenly, person 'A'
leaves the tool's power button in the 'ON' position and walks away.
Later, the shop owner enters the shop and unlocks all the tools. When the bandsaw gets
the unlock command, the Trigger will switch on the power feeding the bandsaw. As soon
as the Trigger unlocks, GRIT immediately checks whether power is flowing. If the Trigger
reads power above the activation current level set for the bandsaw, it cuts the power again
within 1/60th of a second (1 cycle of AC current). GRIT immediately re-locks the bandsaw
and logs an event called 'Emergency Lock'. To allow usage of a tool that has been shut off
due to Emergency Lock, simply turn off the tool, then press the unlock button again.
9
Getting Started
GRIT Lock®
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