Siemens SINAMICS G120P VSD Podręcznik dla początkujących - Strona 20
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6.2.2 Additional & Optional Steps
1. If you want Start on the fly feature, select Parameters menu (leave in standard filter) and go to
P1200 and set to 1.
2. If you want Auto Restart after mains failure or fault, select Parameters menu (leave in standard filter)
and go to P1210 and set to 26.
3. If you want to avoid specific RPM bands due to noise or vibration issues, you can achieve this by
selecting up to four speeds (P1091, P1092, P1093, P1094), and setting the width of these no-go
areas in P1101.
4. If the motor is located in an environment that requires a low level of audible noise you can
sometimes reduce the perceived noise level by increasing the pulse frequency of the VSD output.
The default switching frequency is 4kHz, and can be increased in steps of 2kHz in P1800 up to
16kHz. Note that higher switching rates result in greater VSD losses in the form of heat, and so de-
rates the maximum current capability. This de-rating also depends on the VSD size and the available
maximum frequency values are reduced as the kW size increases. From a practical standpoint you
should consider this information during the planning stage of the job.
5. In some cases you might need more starting torque (and therefore current) to get the motor spinning
instead of stalling (the warning A7409 is shown during this event). The same is true if you need to
accelerate the motor faster than the standard current limit will allow. You can override the default
setting in P640, which governs the maximum motor current, and is normally set to 1.5 x FLA. The
size of the power module compared to the motor FLA will determine how much of an increase is
available. Note that by doing this you are artificially raising the overload safety level.
6. If you want to copy this program, then select Auto (not Hand), go to Extras menu and then to the 'To
BOP' option. Select Yes. There will be a short wait while cloning parameters and zipping the file.
7. If you want to download this program to another drive of the same size (including motor data), then
select Extras menu and go to the From BOP option, select Yes. There will be a short wait
while downloading the parameters. When complete cycle the power and test the drive and motor for
correct operation and direction.
8. If you want to add technological features then go to section 5.3 Typical HVAC Applications and
follow the instructions listed. If the application is not listed, please contact your Siemens Distributor
for technical assistance.
Page 20 of 50
Building Technologies
Last Revised: 4/11/2011