Delta AFE2000 - Manual (Page 2)

Product Application
Industrial Automation BU, Delta Electronics, Inc.
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safety protection and additional features such as large load inertia and 4-quadrant operation. The suggested AC
motor drive and the active front-end unit model for the bridge crane are:
 VFD  VFD110C23A
 AFE  AFE075A23A + CHOKE: 2.1mH
Application Case
System Solution
For bridge cranes, the Delta C2000 series AC motor drive has taken overload problems and long-term system
stability issues as target factors and offers excellent features such as:
1. Full vector control. Supports starting torque up to 150% rated torque at a low frequency of 1Hz in steady motion.
2. Optional braking unit is available to perform 4-quadrant operation .
3. Constant torque at full speed range
4. With AFE2000, regenerative energy is converted by AFE2000 into reusable energy (clean power) and fed back to
the mains.
System Features
 SVC control
The Delta C2000 provides sensorless vector control (SVC) to perform a nearly close-loop control function which
saves from purchasing an encoder and lowers maintenance cost. In addition, it overcomes activation difficulties, and
is capable of initiating a start-up under full load and short-term over-load conditions.
 Braking process control
Prevention of sudden drops and jerky movements is an important factor in overall bridge crane system design.
The coordination between the AC motor drive and the mechanical control should be rigid to prevent sudden drops and
jerking, especially when lifting or lowering a heavy load and when stopping a heavy load in mid-air. The Delta C2000
series offers a special set of parameters and multiple output commands to promptly solve the problem.
 Overload capacity
Normal load: rated output current 120%/min; Heavy load: rated output current 150%/min. This offers sufficient
start-up torque and maintains the DC Bus voltage at 730VDC when torque decreases and it will not trigger OU alarm.
The test report reveals the system allows the bridge crane to operate long-term
 Soft-start, soft-stop, wide speed range and precise positioning.