apfiff09 marine
VACON®
•
129
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7.3 Ramp control
SEL
G
IN 0
IN 1
R
Final Ramp Time
P
Ramp time 1
P
Ramp time 2
DI
Ramp time 1/2
SEL
G
IN 0
IN 1
DI
Inching Active
P
Inching Ramp
MULDIV
VALUE
MULTIP
DIVIS
F
Ramp Reduction
P
100 %
SEL
G
IN 0
IN 1
MULDIV
VALUE
MULTIP
DIVIS
F
Prohibited area
P
1,0
P
Prohibited Factor
SEL
G
IN 0
IN 1
F
Ramp Follower
P
0,0 s
P2.3.1
Start function
ID505
“Start Function”
Ramp:
0
The AC drive starts from 0 Hz and accelerates to the set reference frequency
within the set acceleration time.
Flying start:
1
The AC drive is able to start with the motor running by applying current to the
motor and searching for the frequency corresponding to the speed the motor is
running at. Searching starts from the maximum frequency towards the zero
frequency until the correct value is detected.
Use this mode if the motor is coasting when the start command is given. With
the flying start it is possible to start the motor form actual speed without forcing
the speed to zero before ramping to reference.
Closed loop control will always start like flying start because exact speed of the motor is
known from encoder feedback.
P2.3.2
Stop function
ID506
“Stop Function”
Coasting:
0
Drive stops controlling the motor immediately and allows motor rotate freely.
Ramp:
1
After the Stop command, the speed of the motor is decelerated according to
the set deceleration parameters to zero speed.
DI “Run Enable” will make
coasting stop regardless of selected stop function.
P2.3.3
Acceleration time 1
ID103
“Accel Time 1”
This parameter defines the time required for the output frequency to increase from the
zero frequency to maximum frequency in the linear ramp. When the ramp shape (ID 500)
is used, the total ramp time is longer due to jerks in the beginning and end of
acceleration.
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