Have we experienced cable length issue with multiple small motors applicaiton?
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When we need to drive and control multiple smaller motors, what to Consider?
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1x VSD per 1x motor:
We can install multiple VSDs to control motors. However, this is costly, especially when we need to add comms, output filter, EMI filter etc, each drive.
1x VSD for many motors:
- Motor cable length, the location of MCC compare to the motors would cause motor cable issue. The VSD has limitation of the motor cable length supported, and when driving multiple motors under 1 large VSD, we need to combine the cable length. Typically a modern VSD can allow 150m shielded cable, and then we need to install output filters.
- Motor control, the VSD can control the motors under basic V/F algorithm, it will not be accurate.
- Motor protection, the VSD will not be able to provide comprehensive protection to each motor, hence typically we recommend to install bi-metallic protection relay. Note, electronics relay cannot be installed after VSD.
How about the below product solution?
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INOVANCE MD800 1ph 200 V and 3 ph 400 V supply, Drive ratings: 200 W to 7.5 kW, from 1 to 8 drives each set.
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Seperated rectifier and drive modular design, coupling is never easier. Ideal for DC sharing, load sharing, reduce cost on comms modules, sequential motions.
UpStream
One set of power quality, EMC filter, switchgear, comms module for up to 8 drives. Huge saving for multiple drives.
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DownStream
MultiDrives allow individual motor control, protection and SIL3 STO, maximizing performance, efficiency and protection for applications with multiple motors. 150m shielded motor cable permitted each motor, with space saving in MCC.
Maintenance
Easy programming, maintainence and servicing with click-in and click-out design on inverter modules, hardwire terminals are now connectors. No wiring required when replacing drives.
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Better than one drive driving multiple motors, each inverter module can handle 150m shielded cable length, each motor is controlled indenpendently, and protected with full VSD protections (torque, current, thermal, etc).
Better than multiple separate VSDs, it saves space in cabinet, allows DC sharing, and centralized recitifier allows centralized management on power quality, if THDi<5% or EMC C2 rating are the requirement, with each MultiDrive system, only one set of filter if needed.
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Ask us for sample!!! sales@terautomation.com.au
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