2020432 fp2 recommended ac fuses 4v0

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Document title

Recommended AC Input breaker Flatpack 2 xx/2000Prepared by

Lars HenriksenApproved by

Erling B. SkallerudDate (dd.mm.yyyy)

06.06.2012Revision

4Document no.2020432

Page

1 of 4

Print date: 06 Jun 2012 Page 1 of 4

Issue: 3

Date: 2008-10-21

Introduction:

Internally in each rectifier module there are two input fuses. Main purpose for these is to limit short circuit currents and

disconnect the module from input AC if failure occurs inside the module.

Two different power shelves (PS) for 4 rectifiers exist:

PS 4AC for separate AC feeding to each rectifier position. This PS is used as default in the CTO configuration.

PS 2AC for two AC inputs where one input feeds rectifier positions 1 & 2 and one AC input feeds rectifier 3 & 4.

PS 2AC is used as default in the CTE configuration (large systems min. 24kW), and basically not suitable if only one

PS is present and 3-phase AC feeding is required.

Depending of chosen system configuration, the power supply system can be pre-wired for different AC input feedings

from upstream AC switch board:

1. Separate single phase AC feeding to each individual rectifier module (4AC PS only)2. Single phase AC feeding several modules3. 3-phase AC feeding several modules, IT network, (3-phase, 4 wire delta network)4. 3-phase AC feeding several modules, TN network (3-phase, 5 wire, star)

When dimensioning the upstream feeding mains breaker, one or several of the following parameters have to be met:

A. Discrimination between module input fuse and upstream feeding AC breakerB. Full load with a fully populated system at nominal voltage (i.e. @ 230V AC)C. Full load with a fully populated system at normally lowest nominal voltage from local distributor (i.e. @ 205V

AC)D. Full load with a fully populated system at lowest input voltage specification for the rectifiers (i.e. @ 185V

AC)

Obviously A have to be fulfilled, (unless individual feeding of each rectifier module). As a minimum B have to be

fulfilled but having in mind that distributors normally can guarantee nominal AC voltage +/-10% comply to B is

recommended. If the power system is installed in an area with weak mains and there is a chance of variation below -10%, comply according to D should be considered.

Below you will find Elteks recommendation for upstream AC feeding breaker which is based up on number of rectifier

modules connected to each phase and worst case short circuit current which can occur inside the module.

IMPORTANT! The installation company connecting the system to input mains do have the final responsibi li ty to

investigate local conditions when it comes to mains voltage, and the input mains short circui t capacity. This

company or person has the responsibil ity to choose mains breaker and verif y upstream discrim ination and ful l load

capability.

Input breaker recommendation

NOTE! All calculations for 1-2 Power Shelves (PS) are based on that 4AC PS is present.

(For connection details see Schematic/connection drawing FP2 DC Power System included in the user

documentation)

1.1 Input: 230V AC individual single phase for each rectifier

TO OBTAIN SELECTIVITY Selectivity NOT obtained

Rectifier Full loadcurrent (A)

RecomMended breaker Full loadcurrent (A)

Recommended breaker

Th/Mag Hy/Mag Th/Mag Hy/Mag

1 11,5 25A D-char. 25A C2-char 11,6 16A C-char. 16A C2-charNOTE! Each rectifier has a separate 230VAC single phase input.


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Date: 2008-10-21

1.2 Input: 230V AC 1x single phase

185V AC 205V AC

Number ofPower

shelves

Full loadcurrent per

input (A)

Recommended breaker perinput


input (A)



1 46,4 50A C-char. 50A C2-char 42,2 50A C-char. 50A C2-char

NOTE! 1 separate single phase input feeding one Power Shelf with max. 4 rectifiers on each single phase input. This

is an option in standard CTO for 8kW applications only.

1.3 Input: 230V AC 3x single phase

185V AC 205V AC

Number ofPower

shelves


input (A)



input (A)



1 23,2 25A D-char. 25A C2-char 21 25A D-char. 25A C2-char


NOTE! 3 separate single phase inputs are feeding up to 2 Power Shelves with max. 3 rectifiers on each single phase

input. This is an option in standard CTO.

1.4 Input: 230/400V AC 3-phase, TN network (5 wire system)

185V AC 205V AC

Number ofPower

shelves

Full loadinput

current perphase (A)

Recommended inputbreaker

Full loadinput

current (A)

Recommended input breaker


1 23,2 25A D-char. 25A C2-char 21 25A D-char. 25A C2-char


3 46,4 50A C-char. 50A C2-char 42 50A C-char. 50A C2-char

1.5 Input: 230V AC 3-phase, IT network (4 wire system)

185V AC 205V AC

Number ofPower

shelves

Full loadinput

current perphase (A)

Recommended inputbreaker

Full loadinput

current (A)

Recommended input breaker


1 30,4 32A D-char. 32A C2-char 27,5 32A D-char. 32A C2-char




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Rectifier module input fuse characteristic

Fuse type used at the input in Flatpack 2-xx/2000 module: SB 3AB 15A Littlefuse or equivalent.

Fuse characteristic:


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2020432 fp2 recommended ac fuses 4v0

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