Siemens A1 用户手册
Real Applications
International English
36
MICROMASTER Applications Handbook
7.1.3
Key Parameter Details
Table 7-1
Fan Application with Manual Control
Number Value Meaning
P1000
1
Motorised potentiometer enabled. This allows the push buttons on the AOP to
be used to control the speed.
be used to control the speed.
P0003
3
Allows all parameters to be adjusted and set.
P1031
1
Motorised potentiometer settings stored on power down. The inverter will
restart at the previous selected frequency.
restart at the previous selected frequency.
P1200
34
Flying Start in forward direction enabled. This ensures that if the fan is rotating
the inverter will sense it’s speed and ramp back to the desired speed.
the inverter will sense it’s speed and ramp back to the desired speed.
P1300
2
Quadratic V/F curve selected. Selecting the quadratic curve allows a higher
continuous output, but limits the overload capability, which is not needed in this
case. The quadratic curve also reduces the power consumption because it is
optimised for fan and pump applications.
continuous output, but limits the overload capability, which is not needed in this
case. The quadratic curve also reduces the power consumption because it is
optimised for fan and pump applications.
P1055
0
Jog Key disabled
P1032
1
Reverse direction disabled
Note.
The default settings of minimum and maximum speeds (0 – 50 Hz) are used in this
case.
The default settings of minimum and maximum speeds (0 – 50 Hz) are used in this
case.
All required information such as speed, current and drive status is on the display.
If resonance is experienced in the system, it can be suppressed by using the skip
frequency settings P1091- 1094.
frequency settings P1091- 1094.
7.2
A Closed Loop Controller using a Fan
The application uses an 11 kW MICROMASTER driving an 11 kW motor which
operates the extractor fan in a chemical plant. The extractor maintains a constant
flow rate by measuring flow downstream of a burner system. The MICROMASTER
is installed in a cubicle close to the fan system, and a simple run/ stop signal used
for control. The flow sensor is connected to the analog input to supply the
necessary feedback signal. A resistor is fitted to the input to convert the current
source to a voltage signal (2 to 10 V).
operates the extractor fan in a chemical plant. The extractor maintains a constant
flow rate by measuring flow downstream of a burner system. The MICROMASTER
is installed in a cubicle close to the fan system, and a simple run/ stop signal used
for control. The flow sensor is connected to the analog input to supply the
necessary feedback signal. A resistor is fitted to the input to convert the current
source to a voltage signal (2 to 10 V).
7.2.1 Advantages
· Very significant energy savings compared with fixed speed running.
· Improved process control - in this case, reduced pollution as burner operates at
maximum efficiency.
· Built in PI means no additional controllers etc.
· No manual adjustment needed; simple run/stop commands.