Siemens A1 ユーザーズマニュアル
International English
Simple Applications
MICROMASTER Applications Handbook
21
5
Applications and Possibilities
Most inverters used in industry are controlled via the control terminals, not the front
panel. This section describes some simple control possibilities using these inputs,
and some of the programmable features that may prove useful. The following
descriptions include terminal numbers and parameter values which are valid for
MICROMASTER MM420 inverters. If other products are used please check the
terminal numbers in the Reference Manual supplied with the inverter.
panel. This section describes some simple control possibilities using these inputs,
and some of the programmable features that may prove useful. The following
descriptions include terminal numbers and parameter values which are valid for
MICROMASTER MM420 inverters. If other products are used please check the
terminal numbers in the Reference Manual supplied with the inverter.
5.1
Using a Potentiometer with the Analog Input
Connect a potentiometer (between 5 kΩ and 100 kΩ) to the analog input as shown
in Figure 5-1. The Potentiometer is wired as shown:
in Figure 5-1. The Potentiometer is wired as shown:
1
2
3
4
5
8
Potentiometer
Connection
MICROMASTER
DIN 1
+24 V Output
Figure 5-1
Using a Potentiometer with the Analog Input
Connect a switch between terminals 5 and 8 in order to apply a ‘RUN’ command to
digital input 1.(DIN 1) The default parameter settings of the MM420 will permit
operation using this simple arrangement.
digital input 1.(DIN 1) The default parameter settings of the MM420 will permit
operation using this simple arrangement.
The default maximum and minimum settings for the analog input are 50 and 0 Hz
respectively, so the inverter will run at a frequency somewhere between these
frequencies, depending on the potentiometer position.
respectively, so the inverter will run at a frequency somewhere between these
frequencies, depending on the potentiometer position.
Changing parameters such as P0758 and P0760 will change the range of the
potentiometer accordingly, but remember the absolute maximum and minimum
settings are set by parameters P1080 and P1082. Note that many parameters
cannot be changed while the inverter is running. The display will flash if this is
attempted.
potentiometer accordingly, but remember the absolute maximum and minimum
settings are set by parameters P1080 and P1082. Note that many parameters
cannot be changed while the inverter is running. The display will flash if this is
attempted.
5.2
Using all the Digital Inputs
The digital inputs on the inverter are programmable and many different functions
can be selected. The digital inputs have default settings which are used below, but
can be easily changed.
can be selected. The digital inputs have default settings which are used below, but
can be easily changed.
With the potentiometer still connected, connect two more switches as shown
below. The first switch will run the inverter as before, the second switch will now
reverse the direction (providing a ‘RUN’ signal is already present from the first
switch. The third switch can be used to reset any faults should they occur. These
are the default settings for controlling the MICROMASTER MM420.
below. The first switch will run the inverter as before, the second switch will now
reverse the direction (providing a ‘RUN’ signal is already present from the first
switch. The third switch can be used to reset any faults should they occur. These
are the default settings for controlling the MICROMASTER MM420.