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ABB ACS355-01E-06A7-2 [10/38] Common dc hardware
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10 Description of common DC applications
Drives connected to a common DC bus can take all their energy from the DC bus
only, but one or two drives (principally even more) have to be connected to the
supplying AC line.
Common DC hardware
The hardware of common DC applications is simple: The drive's DC+ and DC-
terminals are connected together as a DC+ busbar and DC- busbar. In ACS355
drives, these busbars are the BRK+ and BRK- terminals
1
.
To keep the stray inductance of the DC bus small, a "star connection" (ie, parallel
copper busbars on supporting insulators, see the figure below) is preferred compared
to a point-to-point connection. This type of connection is also better because drive
terminals are neither designed nor dimensioned for linkage.
One advantage of a common DC configuration is that the supply side hardware
becomes simple as well: one common AC supply (isolator, fuses, contactor and AC
choke) instead of individual supplies.
The figure below presents an example of a common DC configuration with three
drives.
1. ACS355 has a free-wheeling diode parallel to the brake chopper IGBT, but the drive software
has to support common DC applications. ACSM1 drives parallel to ACS355 drives can be used
in common DC applications with the same restriction as ACS355. ACS350 and ACS310 drives,
on the contrary, cannot be used because ACS350 lacks a free-wheeling diode and ACS310
lacks a free-wheeling diode as well as BRK terminals.
EN_ACS355 Common DC application guide_A.book Page 10 Wednesday, December 23, 2009 10:06 AM
Содержание
- List of related manuals 2
- Acs355 3
- Common dc application guide 3
- Introduction to the guide 3
- Table of contents 3
- Description of common dc applications 5
- Dimensioning common dc applications 5
- Example of dimensioning a common dc application 5
- Introduction to the guide 5
- Safety 5
- Start up parameter settings of common dc applications 5
- Table of contents 5
- Table of contents 5 5
- Technical data of common dc applications 5
- Appendix a motor s kinetic energy vs dc capacitors electrical en ergy 6
- Further information 6
- Table of contents 6
- Applicability 7
- Introduction to the guide 7
- Safety instructions 7
- Target audience 7
- What this chapter contains 7
- Contents 8
- Purpose of the guide 8
- Terms and abbreviations 8
- Description of common dc applications 9
- Operation principle 9
- What this chapter contains 9
- Common dc hardware 10
- A1 a2 a3 11
- Common dc bus 11
- Description of common dc applications 11 11
- En_acs355 common dc application guide_a book page 11 wednesday december 23 2009 10 06 am 11
- M1 m2 m3 11
- Dimensioning common dc applications 13
- Limitations 13
- What this chapter contains 13
- Recommendations 14
- Applications containing acsm1 drives 15
- Dc intermediate circuit can absorb a small amount of energy but using the circuit requires careful calculation for a calculation example see appendix a motor s kinetic energy vs dc capacitors electrical energy 15
- Dimensioning common dc applications 15 15
- Dimensioning procedure 15
- If you plan to connect one or more acsm1 drives to the same dc bus with acs355 drives take into account the following recommendations 15
- Instead of an external dc chopper you can use acsm1 s brake chopper which is independent of common dc operation acs355 has a brake chopper as well but in this case it cannot be used 15
- Prefer acsm1 as the supply unit because its supply diode bridge is over dimensioned 15
- Use external ac chokes in supply even though not recommended for acsm1 drives 15
- Dimensioning common dc applications 16
- Dimensioning common dc applications 17 17
- Dimensioning common dc applications 18
- Configuration 19
- Example of dimensioning a common dc application 19
- What this chapter contains 19
- Example of dimensioning a common dc application 20
- The figure below illustrates this configuration the main motor and back drive motor are interconnected via fluids inside the centrifugal decanter 20
- Dimensioning procedure 21
- Example of dimensioning a common dc application 21 21
- Example of dimensioning a common dc application 22
- Before setting the parameters below make sure that you have 23
- Obligatory parameter settings 23
- Planned the dimensioning as described in chapter dimensioning common dc applications 23
- Start up parameter settings of common dc applications 23
- Start up parameter settings of common dc applications 23 23
- Started up the drives as described in the user s manual 23
- This chapter describes how to set the acs355 parameters when starting up a common dc application 23
- Warning 23
- What this chapter contains 23
- Additional parameter settings 24
- Start up parameter settings of common dc applications 24
- Technical data of common dc applications 25
- What this chapter contains 25
- Acs355 data without and with external ac chokes 26
- Technical data of common dc applications 26
- Symbols 27
- Technical data of common dc applications 27 27
- Acs355 dc link capacitance 28
- Technical data of common dc applications 28
- Acs355 charging resistors 29
- Technical data of common dc applications 29 29
- Highest allowed charging currents through supply rectifier 30
- Technical data of common dc applications 30
- Ac choke data 31
- Measured input currents and thd with chk chokes and acs355 31
- Symbols 31
- Technical data of common dc applications 31 31
- Acs355 dc fuse ratings 32
- If there is no overload the fuses can be dimensioned directly according to the power of the drive 32
- Technical data of common dc applications 32
- The fuse rating depends on the fuse type gg or ur and the temporary overload of the drive 32
- The recommended ratings rule of thumb are presented in the table below the voltage rating of the fuses is 690 v 32
- With gg fuses a rating one size smaller can be taken 32
- With ur fuses the rating is determined by the maximum instantaneous dc current because fuses work fast in practice the fuses have to be selected for a current about two times higher than the dc current calculated from the nominal power 32
- Technical data of common dc applications 33 33
- Appendix a motor s kinetic energy vs dc capacitors electrical energy 35
- Calculation example 35
- What this chapter contains 35
- Document library on the internet 37
- Further information 37
- Product and service inquiries 37
- Product training 37
- Providing feedback on abb drives manuals 37
- Aua0000070130 rev a en effective 2009 12 dd 38
- Contact us 38
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