apfiff09 marine
VACON®
•
133
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
Classified as Public
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 the 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
“CLRmpFollEncFreq”
In a normal situation, the ramp generator is not updated with the actual speed from the
encoder (like in open loop control). When the limiting situation has passed (with a step),
the speed is accelerated against the limit controller to the reference speed (if speed
control is used). In case this parameter is active, the speed will increase with the set
ramp times.
This parameter also sets the Ramp Frequency to actual frequency when change from
torque control to speed control is made.
Note:
Disable this parameter if drive is used for hoisting.
Note:
When using under voltage 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
0.0
0
0.4
2
0.8
4
1.2
6
1.6
8
2.1
0
2.5
2
2.9
4
3.3
6
3.7
8
4.2
0
4.6
2
5.0
4
5.4
6
5.8
8
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
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