LEGRAND KEOR T, Installation Manual

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17
KEOR T
Installa
tion M
anual
*Rectifier protection alone should only be considered in the event of separate inputs; if the bypass and
rectifier inputs are combined, the general input protection rating (bypass + rectifier) must reflect the
recommended bypass or general protection rating.
*Recommended discrimination of UPS downstream distribution with inverter short-circuits current (battery
mode).
*** Cables must be selected 1.2 times larger than the recommended size for parallel topologies.
****Load leakage currents are added to those generated by the UPS. If loads with high leakage currents are
present, adjust this value accordingly. It is recommended to adjust the protective device after measuring
the total leakage current with the UPS installed and operational with the intended load. During transitory
phases (power failure, return and voltage fluctuations) short leakage current peaks may occur. Make sure
that the protection is not activated in such cases.
Must be selective with residual current circuit breakers downstream of the UPS connected to the UPS
output. If the bypass network is separate from the rectifier circuit, or in the event of parallel UPS, use a single
residual current circuit breaker upstream of the UPS
If the loads have a nonlinear characteristic, the current on the common mains
supply voltage and auxiliary mains supply voltage input and output neutral
conductors may have a value that is 1.5-2 times the phase value during operation.
In this case, size the neutral cables and the input/output protection adequately.