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ABB ACS355-01E-06A7-2 [21/38] Dimensioning procedure
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Example of dimensioning a common DC application 21
Dimensioning procedure
No. Task Actions to be taken
1. Select the motors and drives. Motor sizes are given by the manufacturer. The
drives you can select based on motor powers
because there are no overloads. (See step 5
below.)
2. Create system power curve vs.
time diagrams.
The decanter works with constant speed and
load; some applications work for several days or
weeks without stopping. They are stopped for
service only. For this reason, the main motor
functions as a motor with shaft power of 22 kW
and the back-drive motor as a generator with
shaft power of 7.5 kW.
In a steady state, the power taken from the line
is:
(Main motor nominal shaft power + Main motor
losses) + (-Generator shaft power - Generator
losses)
= 22 kW + 1.7 kW + (-7.5 kW - 0.7 kW)
= 23.7 kW - 6.8 kW = 16.9 kW
Calculate the losses using rating plate values. If
accurate values are not available, use these
rules of thumb:
P
N
< 3 kW η = 0.7…0.85
P
N
> 3 kW η = 0.85…0.93
3. Select the power supply type and
plan how to handle excessive
regenerated power.
One common supply with fuses or a fuse isolator
will do with a contactor and one CHK-06 choke
(see the table on page 24).
On the assumption that the motor runs at the
nominal speed, the 400 V line current is 33 A,
including harmonics. It is calculated from the
input power +10% (input cos ϕ and converter
losses), added with harmonics using the rule of
thumb of +20%.
Because there is no need for regeneration (see
step 5 below), a diode supply will do. One line
supply through the 22 kW motor's drive is
sufficient. The 7.5 kW drive and motor are
supplied through the DC bus only.
Brake chopper and resistor are not needed
because the decanter is stopped slowly by
means of friction (coasting).
EN_ACS355 Common DC application guide_A.book Page 21 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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