Lockout/Tagout
The safety procedure ensures equipment cannot be energized during maintenance
Lockout tagout
type of contact only closes when the button is pressed
NO contact
DOL stands for in motor control
Direct On Line
this component energizes a contactor to open or close contacts
Coil
number of phases in an industrial electrical circuit
Three (....)
What must every worker attach when performing a lockout procedure?
Personal lock and tag
type of contact opens when the button is pressed
NC contact
this type of starter applies full voltage directly to the motor
DOL starter
device switches high-power loads like motors
Contactor
The phase lag between each of the 3-phases
120 deg
Name one type of hazardous energy that must be isolated during lockout.
Electrical, mechanical, hydraulic, pneumatic, thermal, etc.
color push button is typically used for STOP
red
this protection device in a motor starter prevents damage from excessive current over time
Overload Relay
device switches control circuits and small loads
control relay
Swapping two of the phases on a 3-phase causes this to happen.
Motor reverses direction
What must you do before starting equipment after maintenance?
Ensure all locks/tags are removed by their owners and notify workers
a device is used to indicate if a circuit is energized or a motor is running
pilot light
Reversing the starters changes the motor direction by doing this.
Swapping two phases
this safety feature prevents two contactors from energizing at the same time in reversing circuits
mechanical interlock
Between line-line or line-neutral, this one has the highest voltage
Line-line
Where should locks and tags be installed during lockout?
On each energy-isolating device
type of switch keeps its position after being toggled
maintained contact
thisdevice allows manual switching of phases for forward and reverse
cam switch
this principle (or fundamental force) allows a coil to move a plunger inside a relay or contactor
Electro-magnetism
sqrt(3)