Vacon NX series Applications Manual page 346

VACON · 346
1026 FREQUENCY INCREASE DELAY AFTER STOPPING AUXILIARY DRIVE 7 (2.9.22)
If the speed of auxiliary drive increases slowly (e.g. in soft starter control) then a delay
between the start of auxiliary drive and the frequency drop of the variable speed drive will
make the control smoother. This delay can be adjusted with parameter ID1025.
In the same way, if the speed of the auxiliary drives decreases slowly a delay between the
auxiliary drive stop and the frequency increase of the variable speed drive can be
programmed with parameter ID1026.
If either of the values of parameters ID1025 and ID1026 is set to maximum (300.0 s) no
frequency drop nor increase takes place.
f
out
Start freq. of aux drive + 1 Hz
Start delay of aux.
drive (par. ID1010)
Aux. drive
control
Aux. drive
speed
Fig. 85: Frequency drop and increase delays
1027 AUTOCHANGE 7 (2.9.24)
Table 191: Selections for parameter ID1027
Selection
number
0 Autochange not used
1 Autochange used
8
Frequency drop
delay (par. ID1025)
Stop delay ofaux.
drive (par.ID1011)
Selection name
PARAMETER DESCRIPTIONS
Stop freq.
of aux drive - 1 Hz
Description
TEL. +358 (0)201 2121 · FAX +358 (0)201 212 205
t
Frequency
increase
delay
(par. ID1026)