Industrial Engineer · phase 12 of 16 · noun
Coast Stop
Stop method that disables inverter output and lets the motor slow according to load inertia and friction.
The Explain card
- Plain English
- A coast stop switches the inverter off and lets the motor slow down on its own. Friction and the load decide how long it takes.
- Example
- A big fan on coast stop takes four minutes to come to rest after the command. A small pump with a lot of friction stops in a couple of seconds.
- Why it matters
- Coasting regenerates nothing, so it never trips the drive, and it is what most drives do on a fault or a safety stop. It is also uncontrolled, so a load that should stop in a known time or place cannot be left to coast.
- Hook
- Cut the power and let physics finish.
Word knowledge
How the word is built, where it came from, and what it sits beside in memory.
In a sentence
During commissioning, assign Coast Stop to digital input DI3, open the contact, and record the motor stopping time.
Why these words
- coast Old French coste, side or shore, from Latin costa, rib or side identifies unpowered motion carried by momentum
- stop Old English stoppian, reinforced by Old French estoper, to plug or block names the commanded operating state
Where it came from
- Origin
- English engineering compound formed from coast and stop
- Entered the language
- 20th century
- What changed
- Coast shifted from a shoreline noun to a verb for motion continuing by momentum, while stop shifted from blocking an opening to ending motion; drive engineering joined them as an open compound.
How it is spelled
- Pattern
- Coast keeps the oa spelling commonly used for the long o sound.
- Pattern
- Stop uses a closed syllable with short o and doubles its final p before vowel-led suffixes, as in stopped and stopping.
- Pattern
- The term is normally written as two separate words.
Spelled like
- roast
- boast
- stopped
- stopping
Broken into chunks
-
coast
- coasting
- coasted
-
stop
- stopped
- stopping
What it sits beside
Same subject
- ramp stop
- quick stop
- freewheel stop
- deceleration time
- stop category
Same shape
- ramp stop
- quick stop
- emergency stop
drive stop methods
- Coast Stop
- Ramp Stop
- DC-Braking Stop
open control compounds
- Coast Stop
- Quick Stop
- Emergency Stop
Where it sits in the deck
Phase 12: VFD Commands, References, and Stopping
Starting, referencing and stopping, including the several very different things a drive can mean by the word stop.
