330 Flashcards
Motor Reversing: Controllers and Connections
What is a Manual Reversing Starter
This is a device that come 2 manual contactors paired with their own mechanically interlocked start-stop push button switches.
What are the Parts on the Manual Reversing Starter
A starter (with an overload section), a contactor section, and interlock section. These parts are mounted to a back plate to form a reversing starter.
How Many Jumpers does a Field Assembled Reverse Starter Kit Come with
It comes with 6 Jumpers. These jumpers are used to help change the rotation of the of the motor.
What Letter are the Leads of Terminals for the Jumpers Called
“L terminals” and “T terminals”
What is the Industry Standard for Reversing the Rotation of a Motor
Swapping T1 and T3.
Does the Flow of Current Change Based on the Rotation of the Motor
No, current maintains the same flow in the windings.
What is a Drum Switch
This is an enclosed manual device that changes the rotation of a motor using an insulated rotating shaft. It has a limited enclosure space. Drum Switches are considered controllers.
From 2003-2017 How Many Death have Occurred on Road Construction Sites
1844.
How Likely are Workers on Road Construction Sites More Likely to be Killed
3 times more likely.
A Sign Paddle Should be Visible with ___ Inches Across
18”.
What Terminal Connections are Changed on a Drum Switch to Reverse Rotation
Forward: 1-2 and 3-4
Reverse: 1-3 and 2-4
Terminals 5 and 6 do not change.
How Many OL Sections are Required on a Manual Reverse Starter
Only 1 OL section, but requires 2 Contacts.
What does a Reverse Starter do
It changes the flow of current in the start winding, which leads to the rotation of the motor changing.
What do Crossed Dashed Lines on a Ladder Diagram Indicate
It show that the devices are mechanically interlocked.
Between the Start and Run Windings on a 1 PH Motor, Which has a Lower Resistance
The run windings.
On a DC Motor you Change the Rotation of the Motor by
Changing the flow of current in the armature windings
A FORWARD-STOP-REVERSE Momentary Contact Pushbutton Station uses ___.
Three sets of contacts- one NC and two NO.
