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• VACON®
apfiff09 marine
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
7.2.5 Prohibited frequencies
In some systems it may be necessary to avoid certain frequencies because of mechanical
resonance problems. With these parameters, it is possible to set limits for the prohibited frequency
region and ramp rate factor to use when frequency is going above this area. When the input
reference is increased, the internal reference is kept at the low limit until the input reference is above
the high limit.
P2.2.10.1 Prohibit frequency area 1; Low limit
ID509
“Range 1 Low Lim”
P2.2.10.2 Prohibit frequency area 1; High limit
ID510
“Range 1 High Lim”
Range definition where a different ramp time
defined by “RampTimeFactor”
is used.
Used
Speed Reference [RPM]
Requested Speed Reference
[RPM]
Low Lim
High Lim
P2.2.10.3 Ramp time factor for prohibited range
ID518
“RampTimeFactor”
Multiplier of the currently selected ramp time between prohibit frequency limits.
Time [s]
Speed [RPM]
Low Lim
High Lim
Ramp Time
Factor = 2,5
Ramp Time
Factor = 0,3
Figure 7-1. Ramp rate scaling between prohibit frequencies
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