Electrical Connections—UPS

3.2.1Rectifier and Bypass Input Supply of the UPS

Overcurrents

Install suitable protective devices in the distribution unit of the incoming mains supply, considering the power cable current-carrying capacity and overload capacity of the system. Generally, the magnetic circuit breaker with IEC60947-2 tripping curve C (normal) at the 125% of the nominal current listed in Table 41 is recommended.

Split bypass: In case a split bypass is used, separate protective devices should be installed for the rectifier input and bypass input in the incoming mains distribution panel.

NOTE

The rectifier input and bypass input must use the same neutral line.

For an IT power network system, a 4-pole protective device must be installed on the external input distribution and external output distribution of the UPS.

Earth Leakage, RCD Devices

Any residual current detector (RCD) installed upstream of the UPS input supply:

•Must be sensitive to DC unidirectional pulses (Class A)

•Must be insensitive to transient current pulses, and

•Must have an average sensitivity, adjustable between 0.3 and 1A.

To avoid false alarms, earth leakage monitoring devices when used in systems with split bypass input or when used in paralleled UPS configurations, must be located upstream of the common neutral sinking point. Alternatively, the device must monitor the combined four-wire rectifier and split bypass input currents.

The residual earth current introduced by the RFI suppression filter inside the UPS is greater than 3.5mA and less than 300mA. Liebert recommends verifying the selectivity with all other differential devices both upstream of the input distribution board and downstream (toward the load).

3.2.2External Battery

The DC-compatible circuit breaker provides overcurrent protection for UPS system and battery, which is provided by the external battery cabinet.

3.2.3UPS Output

If an external distribution panel is used for load distribution, the selection of protective devices must provide discrimination with those that are used at the input to the UPS (see Table 47).

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Emerson 115-50/60HZ Rectifier and Bypass Input Supply of the UPS Overcurrents, Earth Leakage, RCD Devices, UPS Output
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115-600V, 115-208, 115-120, 115-50/60HZ, 115-480 specifications

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