Sensorless Vector Controllers AC VFD Drive for Plastic Injection
Machine
Injection molding is a manufacturing technique for making parts
from plastic material. Heated, fluid plastic is injected at high
pressure into a mold, which is the inverse of the desired shape.
The steel or aluminum mold is machined with the contours of the
final product. Injection molding is used for create a variety of
parts, like plastic milk cartons, containers, bottle caps,
automotive dashboards, pocket combs, and most other plastic
products available today. Injection molding is the most common
method of part manufacturing. AC drives will commonly be used to
power the hydraulic oil pressure pump for operating the mold works
of an injection-molding machine. Servo drives can be used to
operate the injection screw, as precision control is often required
for the injection step. Significant energy savings are often
realized by replacing hydraulics with electric drive systems on
injection molding machines.
Application Challenges
- High cost for initial tooling
- Energy savings
- Durability for continuous operation
- Cyclical load conditions
- Protection of expensive molds and screws
- Quick restart in the event of power loss
Features of 303 series injection application
Features | Benefits |
Analog Input Terminal | 4 routes analog input: 2 routes 0~10V voltage source, 2 routes
current source 0~20mA input injection card accepts 0-1A signal |
Terminal-Peripheral equipment control | Control start/stop with the contact or button to simply realize the
automation control of the entire equipment system. |
DC Braking | Braking frequency: 0.1~60Hz Braking time: 0~30 seconds Braking
current: 0~100% rated current |
Power range of 303 VFD
Voltage: 3 phase 380VAC(304VAC – 460VAC)
Power: 0.75kw/1HP – 400kw/535HP
Specification of 303 VFD
Item | Specification |
Input frequency | 50/60Hz |
Output frequency | 0-600Hz |
Overload current | 150% rated current 1min., 180% 2 sec. |
Control mode | sensor-less vector control(SVC), V/F control |
Starting torque | 150% 1Hz (SVC 150% 0.5Hz) |
Control precision | ±0.5% |
Given Frequency Resolution | Digital given: 0.01Hz, analog given: 0.05Hz |
Running Mode | Keyboard, control terminal (two-line control, three-line control),
RS485 |
Output Voltage self-adjustment | When AVR function is enabled, the input voltage changes, while the
output voltage almost remains unchanged |
Frequency setting signal | 0~+10V; 0~20mA; |
Protection function | Short circuit, overcurrent, overload, overvoltage, undervoltage,
default phase, overheating, and external fault, etc. |
Enclosure | IP20 |
Cooling mode | forced air cooling |
Vibration | Less than 0.5g |
Ambient temperature / Humidity | -10 Degrees~+40 Degrees / 20~90%Rh (no condensation) |
Tips:
A variable-frequency drive (VFD) is a system for controlling the
rotational speed of an alternating current (AC) electric motor by
controlling the frequency of the electrical power supplied to the
motor. A variable frequency drive is a specific type of
adjustable-speed drive. Variable-frequency drives are also known as
adjustable-frequency drives (AFD), variable-speed drives (VSD), AC
drives, microdrives or inverter drives. Since the voltage is varied
along with frequency, these are sometimes also called VVVF
(variable voltage variable frequency) drives.
