LEGRAND KEOR HP 400kVA Installation Et Démarrage page 33

Installation and start-up of UPS Keor Hp 400-800kVA
Installation et démarrage de l'UPS Keor Hp 400-800 kVA
Installazione e avviamento UPS Keor Hp 400-800kVA
fuses. Protection circuit breakers must be selected according to the maximum short-circuit
current (max Isc) that is needed to determine the breaking power of automatic circuit breakers,
and to the minimum current (min Isc) that is needed to determine the maximum length of the
line protected. The protection against short-circuit must operate on the line before any thermal
and electrothermal effects of the overcurrents may damage the cable and relevant connections.
During the electrical installation take particular care to respect the phase rotation. The
terminal boards for cables connection are positioned at the front of the UPS, under the
breakers. To access the terminals remove the front protection, extracting the fixing bolts.
Mains connection
The connection to the mains must be carried out with protection fuses between the
mains and the UPS.
The use of differential protection devices in the line supplying the UPS is
unadvisable. The leakage current to ground due to the RFI filters is rather high
and it can cause spurious tripping of the protection device.
According to CEI EN62040-1 standard, in order to take into account the UPS'
leakage current, residual current devices having adjustable threshold can be used.
Power (kVA)
Input Fuses (A)
Input cables
2
(mm
)
Ground cables
Output cables
Battery cables
Electrical connection data
Rectifier
Bypass
Rectifier
Bypass
2
(mm
)
2
(mm
)
2
(mm
)
400 500
3x800 3x800
3x1000 3x1000
3x2x150 3x2x185
4x2x240 4x2x240
240 240
4x2x240 4x2x240
2x2x185 2x2x240
600 800
3x1000 3x1250
3x1250 3x1600
3x2x240 3x2x300
4x2x300 4x2x400
300 400
4x2x300 4x2x400
2x2x300 2x2x400
OMD39075 REV. F 33