User Manual
EM303A General Purpose Inverter
11
1.2 Basic Functions of EM303A
1.2.1 Process PID Control
2 process PID control modes: Speed process PID control and torque process PID
control. When output of process PID control is taken as inverter’s speed input, it
is speed process PID control. When output of process PID control is taken as
inverter’s torque input, it is torque process PID control. Speed process PID
control is applicable to all drive modes, while torque process PID control is only
active in SVC1.
Speed process PID control is used for:
z Pressure control: Regulate motor speed by taking pressure signal as a feedback
to keep pressure constant.
z Flow control: Regulate motor speed by taking flow signal as a feedback to keep
flow constant.
z Temperature control: Regular motor speed by taking temperature signal as a
feedback, to keep temperature constant.
Torque process PID control is used for:
z Tension control: Regulate motor’s torque current by taking tension signal as a
feedback to keep tension constant.
1.2.2 Program Operation (Simple PLC)
Program operation is that inverter finishes specified control logic according to the
mode and time set in the program. Program operation is categorized as speed
program operation, torque program operation and process PID program operation
(including speed and torque process PID program operation). The program
operation mode can be further categorized as: Single-cycle (stop after
completion), run at the 7
th
preset speed after single-cycle, limited continuous
cycle (stop after completion), and unlimited continuous cycle.
1.2.3 Wobbulation Operation (Textile only)
Wobbulation is applied to textile and chemical fiber industry that needs for
traverse and winding.
1.2.4 Stepping Mode Operation
Provide 5 stepping input modes for speed, torque and process PID input control
modes.
1.2.5 Droop Control
When the machine is driven by multi-motor, setting function of droop control can
evenly assign the output power of each inverter.
1.2.6 Stop Control at Power-off
When driving load with big inertia, the inverter will automatically enter stop
control status in case of power failure, and convert the rotational kinetic energy
into electrical energy to stop the motor quickly. It prevents the system from free
revolving with big inertia for a long time.
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