Eurotherm 590+ Series, Руководство по эксплуатации продукта, Страница: 91 / 308

Operating the Converter
4-15
590+ Series DC Digital Converter
Starting and Stopping Methods
Stopping Methods
Note:
•
If the Converter is “non-regenerative” (2-quad - 591+) it effectively coasts to a stop once the
current demand reverses.
•
If the Converter is “regenerative” (4-quad - 590+) then it can stop faster because it uses
energy from the load, i.e. reverse current is allowed to flow.
Normal Stop and Program Stop are only relevant for a “regenerative” controller.
The parameters STOP TIME and PROG STOP TIME have associated timers which initiate a
Coast Stop after the timed period.
The Coast Stop has direct control of the Run relay with no intervening
electronics.
All associated parameters can be found in the STOP RATES menu.
Terminal Terminal Terminal Terminal Description Description Description Description Function Function Function Function Parameter Parameter Parameter Parameter Priority Priority Priority Priority
B9 Coast Stop Motor coasts to rest -- Overrides Program
Stop and Normal Stop
B8 Program Stop Motor decelerates at
Program Stop rate
PROG STOP TIME Overrides Normal
Stop
C3 Start/Run
(Normal Stop) Motor decelerates at
Normal Stop rate STOP TIME --
Incorrect Speed Response
Under damped response
Speed
Time
8
causing overshoot or `ringing'
Incorrect Speed Response
Over damped response takes a
long time to reach Steady Sate
Speed
Time
8
Correct Response
Critically Damped Response with no more than 4% of
maximum speed from first overshoot to first undershoot
Speed
Time
4%
9
MMI Menu Map
1
SETUP PARAMETERS
2
STOP RATES