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5. OPERATING MODES
G85139-H1751-U529-D1
© Siemens plc 1999
4/8/99
36
5.
OPERATING MODES
5.1 Digital Control
For a basic start-up configuration using digital control, proceed as follows:
(1)
Connect control terminal 9 to terminal 5 via a simple on/off switch. This sets up the inverter for clockwise rotation of the motor
shaft (default).
(2)
Secure all covers to the unit and then apply mains power to the inverter. Set parameter P009 to 002 or 003 to enable all
parameters to be adjusted.
(3)
Check that parameter P006 is set to 000 to specify digital setpoint.
(4)
Set parameter P007 to 000 to specify digital input (i.e. DIN1, terminal 5 in this case) and disable the front panel controls.
(5)
Set parameter P005 to the desired frequency setpoint.
(6)
Set parameters P080 to P085 in accordance with the rating plate on the motor
(see Figure 4.2.1)
.
(7)
Set the external on/off switch to ON. The inverter will now drive the motor at the frequency set by P005.
5.2 Analogue Control
For a basic start-up configuration using analogue voltage control, proceed as follows:
(1)
Connect control terminal 9 to terminal 5 via a simple on/off switch. This sets up the motor for clockwise rotation (default).
(2)
Connect a 4.7 k
W
potentiometer to the control terminals as shown in Figures 2.2.4 and 2.2.6 (MMV) (Figures 3.2.2 and 3.2.4
(MDV)) or connect pin 2 (0V) to pin 4 and a 0 - 10 V signal between pin 2 (0V) and pin 3 (AIN+).
(3)
Set the Analogue Input 1 Configuration DIP selector switches 1, 2 and 3 for voltage (V) input. (
see Figure 3.2.2-3.2.4, Section
4.1.2)
(4)
Secure all covers to the unit and then apply mains power to the inverter. Set parameter P009 to 002 or 003 to enable all
parameters to be adjusted.
(5)
Set parameter P006 to 001 to specify analogue setpoint.
(6)
Set parameter P007 to 000 to specify digital input and disable the front panel controls.
(7)
Set parameters P021 and P022 to specify the minimum and maximum output frequency settings.
(8)
Set parameters P080 to P085 in accordance with the rating plate on the motor
(see Figure 4.2.1).
(9)
Set the external on/off switch to ON. Turn the potentiometer (or adjust the analogue input control voltage) until the desired
frequency is displayed on the inverter.
5.3
Motor Control Modes
The MICROMASTER Vector and MIDIMASTER Vector inverters have four different modes of operation which control the relationship
between the voltage supplied by the inverter and the speed of the motor. The motor control mode of operation is selected at P077:
·
Linear voltage/frequency Operation.
·
Flux Current Control (FCC) which is used to maintain full flux conditions in the motor.
·
Quadratic voltage/frequency relationship which is used for pumps and fans.
·
Sensorless Vector. The inverter calculates the changes required in output voltage to maintain the desired motor speed.
These modes are described in more detail below.
5.3.1 Linear Voltage to Frequency (V/f) (P077 = 0 or 2)
This mode is used for synchronous motors or motors connected in parallel. Each motor should be installed with a thermal overload
relay if two or more motors are driven simultaneously by the inverter.
