Siemens A1 ユーザーズマニュアル
International English
Simple Applications
MICROMASTER Applications Handbook
25
Overtemperature in the inverter is usually caused by a high ambient temperature, a
faulty or blocked fan, or blocked air inlet or outlet.
faulty or blocked fan, or blocked air inlet or outlet.
5.8 Some
Additional
Features
The MICROMASTER has many useful features built into the software and
available for the user. Some of these are briefly described below. The manual
gives details of how to select and use these features. Advanced features such as
Serial Interface, Closed loop Control, Braking operation etc. are described
section 8.
available for the user. Some of these are briefly described below. The manual
gives details of how to select and use these features. Advanced features such as
Serial Interface, Closed loop Control, Braking operation etc. are described
section 8.
5.8.1 Display
Mode
The display normally shows the output frequency, but output current, motor speed
etc. can be selected instead.
etc. can be selected instead.
5.8.2 Ramp
Smoothing
The rate of change of ramp can be limited to limit ‘jerk’. The smoothing is
calculated from the ramp up time, so if the ramp down time is very different
smoothing will not be so effective during ramp down. Smoothing is not effective at
ramp rates of less than 0.3 seconds. Smoothing has the effect that if the inverter is
ramping up and a stop signal given, there will be a delay before the inverter begins
to ramp down again. This effect can be optionally disabled using parameter .
calculated from the ramp up time, so if the ramp down time is very different
smoothing will not be so effective during ramp down. Smoothing is not effective at
ramp rates of less than 0.3 seconds. Smoothing has the effect that if the inverter is
ramping up and a stop signal given, there will be a delay before the inverter begins
to ramp down again. This effect can be optionally disabled using parameter .
Frequency
Normal Ramping
Ramping with smoothing
Figure 5-4
Smoothing applied to UP and DOWN ramps
5.8.3 Display
Scaling
The value in display can be scaled to match the process and show ‘Litres per
minute’ or ‘Metres per second’ etc.
minute’ or ‘Metres per second’ etc.
5.8.4
Skip Frequencies etc.
If these frequencies are set, the inverter will not run at these output frequencies.
Resonance problems can be avoided using this feature.
Resonance problems can be avoided using this feature.
The bandwidth can be adjusted by setting the appropriate parameter.