Santerno Sinus Penta - Page 382

SINUS PENTA
PROGRAMMING GUIDE
382/486
C247 Frequency Decrease Rate
C247
Range
1 ÷ 1000
1 ÷ 1000%
Default
10
10%
Level
ENGINEERING
Address
1247
Control
IFD, VTC
Function
This parameter sets the frequency decrease rate during the speed search stage.
The frequency decrease rate (expressed in Hz/s) is given from the following formula:
(f
max
x C247) / 10
This means that when C247
=100%=1, the Penta drive takes 10s to go from the max.
frequency to 0Hz. When C247=10%=0.1 (default value), the system takes 100s to go
from the max. frequency to 0Hz.
The maximum frequency of the connected motor is given from the following formula:
f
max
= (npoles x C029) / (2 x 60).
NOTE The frequency decrease rate is not dependent on the preset ramp times.
NOTE
When the Penta drive enters the current limitat
ion mode, the time the system takes for
speed searching can be longer than the preset time.
C248 Current Used for Speed Searching
C248 Range
20 ÷ Min[Ipeak inverter/Imot, 100] 20% ÷ Min[Ipeak inverter/Imot, 100%]
Default
75
75%
Level
ENGINEERING
Address
1248
Control
IFD, VTC
Function
Determines the max. current level for speed searching; it is expressed as a percentage
of the rated motor current.
C249 Speed Searching Starting Level
C249 Range
0 ÷ 3
0: Last speed
1: MaxSpd/Last dir.
2: MaxSpd/Pos. Dir.
3: MaxSpd/Neg.Dir.
Default
0
0: Last speed
Level
ENGINEERING
Address
1249
Control
IFD, VTC
Function
Speed Searching starts according to the value set in C249:
C249 = 0:[Last Speed Value] – the last speed search value generated before
disabling the system is used for speed searching.
C249 = 1:[MaxSpd/LastDir.] –
the max. speed programmed for the motor in the last
direction of rotation of the connected motor is produced.
C249 = 2:[MaxSpd/Pos.Dir] – the speed searching function will beg
in with the max.
speed programmed for the motor in the positive direction of rotation independently
of
the last frequency value produced before disabling the drive.
C249 = 3:[MaxSpd/Neg.Dir] –
as “2”, but the direction of rotation of the connected
motor will always be negative.