Industrial Engineer · phase 12 of 16 · noun
Deceleration Time
Configured time for the drive to ramp between defined high and low frequency reference points.
The Explain card
- Plain English
- Deceleration time is how long the drive takes to ramp down, usually from maximum to zero. Every decrease in the reference, including a ramp stop, is spread over it.
- Example
- A fan is set to a 60 second deceleration. Press stop and it takes a full minute to wind down, because a shorter ramp would regenerate more than the bus can absorb.
- Why it matters
- Deceleration is where energy comes back, so a short ramp on a heavy load means overvoltage trips or a braking resistor. Stall prevention stretches it silently, which is why the stop you programmed and the stop you get can differ.
- Hook
- Slowing down costs more than speeding up.
Word knowledge
How the word is built, where it came from, and what it sits beside in memory.
In a sentence
During conveyor commissioning, the technician increased Deceleration Time to prevent a DC bus overvoltage fault when the VFD stopped the motor.
Why these words
- deceleration English formation from de- and acceleration, ultimately from Latin celer, swift names the slowing portion of the phrase
- time Old English tīma, a period or season identifies duration as the measured quantity
Where it came from
- Origin
- English technical compound combining deceleration with time
- Entered the language
- 20th century
- What changed
- Deceleration developed from the general sense of reducing speed and later became a standard engineering modifier for durations, rates, and controlled-motion settings.
How it is spelled
- Pattern
- Deceleration drops the final e of decelerate before the suffix -ion.
- Pattern
- Time uses a silent final e to mark the long i sound.
Spelled like
- acceleration
- generation
- drive
- line
Broken into chunks
-
de
- decrease
- deactivate
-
celer
- accelerate
- celerity
-
ation
- rotation
- modulation
-
time
- runtime
- downtime
What it sits beside
Same subject
- acceleration time
- ramp stop
- DC bus overvoltage
- frequency reference
Same shape
- Acceleration Time
- scan time
- response time
VFD ramp parameters
- Acceleration Time
- Deceleration Time
motor stopping methods
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.
