Danfoss VACON NX All-in-One Application Manual page 275

VACON® NX All-in-One
Application Guide
Similarly, 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 ID 1026.
If either of the values of parameters ID 1025 and ID 1026 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
Illustration 88: Frequency Drop and Increase Delays
10.431 (ID 1027) Autochange
Location in the menu: P2.9.24 (Pump and Fan Control Application)
Use this parameter to enable or disable the rotation of the start sequence and the priority of motors.
The automatic change of starting and stopping order is activated and applied to either the auxiliary drives only or the auxiliary
drives and the drive controlled by the AC drive depending on the setting of parameter ID 1028, Automatics selection. By default, the
Autochange is activated for 2 drives. See
10.432 (ID 1028) Autochange and Interlock Automatics Selection
Location in the menu: P2.9.25 (Pump and Fan Control Application)
Use this parameter to select whether the autochange is applied to the auxiliary drives or all drives.
Selection Selection name
number
0 Automatics (autochange/interlockings)
applied to auxiliary drives only
1 All drives included in the autochange/
interlockings sequence
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Stop freq.
of aux drive - 1 Hz
Frequency drop
delay (par. ID1025)
Stop delay ofaux.
drive (par.ID1011)
Illustration 20 and 10.631.2 Pump and Fan Automatics with Interlocks and
Description
The drive controlled by the AC drive remains the same. Only the mains
contactor is needed for each drive. See
The drive controlled by the AC drive is included in the automatics and
two contactors are needed for each drive to connect it to the mains or
the AC drive. See
Frequency
increase
delay
(par. ID1026)
Illustration
Illustration 90.
AB296635287482en-000301 / DPD00903 | 275
Parameter Descriptions
t
Autochange.
89.