Operating Instructions

Chapter 4 - Parameters and Menu Structure
Parameters (M3)
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Siemens Industry, Inc.
Siemens BT300 HVAC Drive
DPD01809
Smart Infrastructure
2019-05-29
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: