Eltek Valere Flatpack2, Quick Start Manual, Page: 13 / 36

Quick Start Guide Flatpack2 PS System, 4U, SP2-based
356825.103, 2v0 -2011-09
13
External AC Fuses  Recommended Rating
The site’s AC supply quality is of great importance. In general, a site with better AC supply quality
(stable nominal voltage) may use smaller breakers.
WARNING:
Always replace a rectifier with blown internal AC fuse with a new module, and send the malfunctioning module for servicing.
AC Mains
Appendix
For installations in
USA and Canada only

For external fuses above 50A, only the high current backplane can be used

External fuse rated 32A is replaced by 40A

External fuse rated 63A is replaced by 70A

The installation has to comply with the NEC/CEC requirements

Connection to AC Mains shall be in accordance with the number of power
shelves in the tables. If number of shelves exceeds the numbers in the
table, a combination of several AC Mains must be used instead
NEC/CEC Requirements
AC Mains No of Power Current Max. Ext. Fuse Ext. Fuse
Input Type ** Shelves (Type) per input (A)
205VAC 185VAC
Type Th/Mag
205VAC 185VAC
Type Hy/Mag
205VAC 185VAC
TN net (Y)
N
3 phase
1 (4AC) 21.5 24.0 ← 25A-D → ← 25A-C2 →
2 (4AC) 32.2 36.0 ← 40A-C → ← 40A-C2 →
3 (4AC or 2AC) 43.0 47.9 ← 50A-C → ← 50A-C2 →
IT net ( ∆ )
230VAC
3 phase
1 (4AC) 28.4 31.7 ← 32A-D → ← 32A-C2 →
2 (4AC) 55.8 62.3 ← 63A-C → ← 63A-C2 →
3 (4AC or 2AC) 74.4 83.0 80A-C 100A-C 80A-C2 100A-C2
230VAC
1 phase
1 (4AC) 21.5 24.0 ← 25A-D → ← 25A-C2 →
2 (4AC) 32.2 36.0 ← 40A-C → ← 40A-C2 →
Doc 2020432,3v0
Recommended External AC Fuses per AC Mains Feed Input
Flatpack2 Systems with 2000W Rectifiers
1AC Feed to 1 Flatpack2 rectifier
Recommended External Fuse
Type FS=I FS=0
Th/Mag 25A-D 16A-C
Hy/Mag 25A-C2 16A-C2
** The external AC Mains Input is internally connected to the power shelves and rectifiers at factory.
Refer to your system’s specific schematic and connection drawings for more details.
Notes:

Use the values in the 185VAC column,
if you are unsure or know that the available AC mains voltage may drop below 205VAC

The recommendations apply for use of
– Thermal magnetic circuit breaker (Th/Mag), type Siemens 5SX or 5SY series, MG C60H
series or similar; and
– Hydraulic magnetic breaker (Hy/Mag), type CBI QF frame or QY frame, Airpax or similar

For more information regarding External AC fuses, please read the document 2020432

Systems with more than 3 power shelves require more than 1 AC Mains Feed Input
FS=I
( Fuse Selectivity: Internal )
which means that the Flat-
pack2 rectifier’s internal fuse
will trip before the external AC
fuse.
FS=0
( Fuse Selectivity: none )
these fuse types may be used
when it is irrelevant whether
the internal or the external fuse
trips first.
AC Mains No of Power Current Max. Ext. Fuse Ext. Fuse
Input Type ** Shelves (& Rectifiers) per input (A)
205VAC 176VAC
Type Th/Mag
205VAC 176VAC
Type Hy/Mag
205VAC 176VAC
TN net (Y)
N
3 phase
1 (4) 32.9 38.3 ← 50A-D → ← 60A-C2 →
2 (8) 49.3 57.5 50A-D 63A-D ← 60A-C2 →
3 (12) 65.8 76.6 ← 80A-D/100A-C →
IT net ( ∆ )
230VAC
3 phase
1 (4) 43.5 50.7 50A-D 60A-D ← 60A-C2 →
2 (8) 85.4 99.5 ← 100A-C →
3 (12) 113.9 132.7 125A-C 150A-C
230VAC
1 phase
1 (1) 16.5 19.2 *** ← 50A-D → ← 60A-C2 →
1 (2) 32.8 38.4 ← 50A-C → ← 60A-C2 →
1 (3) 49.3 57.5 50A-D 63A-D ← 60A-C2 →
1 (4) 65.8 76.6 ← 80A-D/100A-C →
Doc 2052045,1v0
** The external AC Mains Input is internally connected to the power shelves and rectifiers at factory.
Refer to your system’s specific schematic and connection drawings for more details.
*** When no Fuse Selectivity is required, you can use a 25A-C fuse instead of the recommended 50A-D
Recommended External AC Fuses per AC Mains Feed Input
Flatpack2 Systems with 3000W Rectifiers
Notes:

Use the values in the 176VAC column,
if you are unsure or know that the available AC mains voltage may drop below 205VAC.

The recommendations apply for use of
– Thermal magnetic circuit breaker (Th/Mag), type Siemens 5SX or 5SY series, MG C60H
series or similar; and
– Hydraulic magnetic breaker (Hy/Mag), type CBI QF frame or QY frame, Airpax or similar

For more information regarding External AC fuses, please read the document 2052045

The system is implemented with 4AC-3KW Power Shelves. Systems with more than 3 power
shelves require more than 1 AC Mains Feed Input