Chapter 4 - Parameters and Menu Structure
Parameters (M3)
69 | 180
Siemens Industry, Inc.
Siemens BT300 HVAC Drive
DPD01809
Building Technologies
2016-06-07
Prohibited Frequencies (M3.7)
In some systems it may be necessary to avoid certain frequencies due to mechanical resonance problems. By
setting up prohibited frequencies, these ranges are skipped.
The prohibited frequencies settings are presented in the following table:
Table 44: Prohibited Frequencies Settings.
Structure
Parameter
Unit
Min
Max
Default
ID
Description
P3.7.1
Range 1 Low Lim
Hz
0
320
0
509
Defines the low limit of the first
prohibited frequency. The drive will
change its accel/decel time by the
RampTimeFactor (P3.7.7) while
within the range of this low limit and
the Range 1 High Lim (P3.7.2).
NOTE: The drive will not control
within these ranges, it will either be
faster or slower, but never within
the range defined.
P3.7.2
Range 1 High Lim
Hz
0
320
0
510
Defines the high limit of the first
prohibited frequency. The drive will
change its accel/decel time by the
RampTimeFactor (P3.7.7) while
within the range of this high limit
and the Range 1 Low Lim (P3.7.1).
NOTE: The drive will not control
within these ranges; it will either be
faster or slower, but never within
the range defined.
P3.7.3
Range 2 Low Lim
Hz
0
320
0
511
Defines the low limit of the second
prohibited frequency. See Range 1
Low Lim (P3.7.1) for further details.
P3.7.4
Range 2 High Lim
Hz
0
320
0
512
Defines the high limit of the second
prohibited frequency. See Range 1
High Lim (P3.7.2) for further details.
P3.7.5
Range 3 Low Lim
Hz
0
320
0
513
Defines the low limit of the third
prohibited frequency. See Range 1
Low Lim (P3.7.1) for further details.
P3.7.6
Range 3 High Lim
Hz
0
320
0
514
Defines the high limit of the third
prohibited frequency. See Range 1
High Lim (P3.7.2) for further details.
P3.7.7
RampTimeFactor
0.1
10
1
518
Defines the multiplier of the
currently selected ramp time (accel
time 1/2 and decel time 1/2)
between the prohibited frequency
limits.
Example:
A resonance noise is occurring on an air handling unit when the drive speed is around
75% (45 Hz). Complete the following:
1.
Set Prohibited Frequency Range 1 Low Limit (P3.7.1) to a value of 44.5.
2.
Set Prohibited Frequency Range 1 High Limit (P3.7.2) to a value of 45.5.
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