PROGRAMMING GUIDE
SINUS PENTA
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17. PROHIBIT SPEED MENU
17.1. Overview
This menu allows setting prohibit speed ranges that the motor cannot maintain at constant rpm due to mechanical
resonance.
Three prohibit speed ranges are available: 3 intermediate values of the speed range and their semi-amplitude (one for
all ranges).
In this way, the speed reference value is never included in one of the preset speed ranges; when decreasing, if the
speed reference matches with the max. allowable value of a prohibit speed range, the value assigned to the reference is
given by the min. allowable value of the speed range, and vice versa when the reference is increasing.
The discontinuity of the speed reference has no effect on the actual speed of the connected motor, because this will
vary with continuity until it reaches the new rpm value of the speed reference.
The intermediate values of the prohibit speed ranges are to be intended as absolute values (independent of the
reference sign, +/-).
Figure 12: Prohibit Speed ranges
Figure 12 illustrates different trends of the speed reference when it matches with the max. allowable value of a prohibit
speed range when decreasing (red) or when it matches with the min. allowable value of a prohibit speed range when
increasing (blue).
Example:
P105 = 500 rpm Prohibit speed 1
P106 = 650 rpm Prohibit speed 2
P107 = 700 rpm Prohibit speed 3
P108 = 50 rpm Semi-amplitude of prohibit speed ranges
Range Number Min. Allowable Value Max. Allowable Value
1 450 rpm 550 rpm
In this case, the second and third prohibit ranges partially match, because the max. allowable value of the second range
(700 rpm) is higher than the min. allowable value of the third range (650 rpm), thus forming a prohibit speed range
ranging from 600 rpm to 750 rpm.
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