User`s manual

102 • Vacon apfiff09 marine
Tel. +358
6
7.3.2 Ramp Options
P2.3.12.1 Ramp: Skip S2/S4 ID1900
This function is used to bypass the second corner S ramp (i.e. to avoid the unnecessary
speed increase, the blue line in Figure 7-5) when the reference is changed before the
final speed is reached. Also S4 is bypassed when reference is increased while speed is
ramping down.
Figure 7-5. Second S curve is bypassed when reference changes at 25 Hz
P2.3.12.2 CL Ramp generator follows encoder ID1902
In a normal situation, the ramp generator is not updated with the actual speed from the
encoder (like in open loop control). So when the limiting situation has passed (with a
step) speed is accelerated against the limit controller to the reference speed (if speed
control is used). In case this parameter is active speed will increase with set ramp times.
This parameter also sets the Ramp Frequency to actual frequency when change from
torque control to speed control is made.
Note: When using undervoltage controller function 2 (Ramping to zero speed) this
parameter needs to be activated to have similar operation than in open loop control.
0
5
10
15
20
25
30
35
40
0,00 0,42 0,84 1,26 1,68 2,10 2,52 2,94 3,36 3,78 4,20 4,62 5,04 5,46 5,88
10 % S
0 % S
S2 Skip
0
10
20
30
40
50
60
0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5
Activated
FreqRef
FreqOut
TorqueLim
0
10
20
30
40
50
60
0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5
Disabled
FreqRef
FreqOut
TorqueLim