Liebert 130 kVA user manual Hipulse Single Phase ‘1+N’ UPS System

User Manual

Hipulse - Single Phase ‘1+N’ UPS System 130 kVA - 110V

8.3.1.2 Switching the system to maintenance bypass from normal operation

WARNING

The internal maintenance bypass must not be used when the UPS system is comprised of more than two UPS modules in parallel.

Follow the procedure for the single UPS by referring to Chapter 5 – Operating Instructions: Paragraph 5.4. For a system configured in the “1+N system”, the changeover from “load on inverter ” to “load on bypass” will occur only when the operation described in point 3 has been completed on both UPS modules.

8.3.1.3 Switching the system ON from a maintenance power down condition.

Follow the procedure for single UPS, referring to Chapter 5 – Operating Instructions: Paragraph 5.2 .

8.3.1.4 Switching OFF and isolating one UPS while the other remains in service.

1.In sequence, open the UPS isolators Q4 (output), Q1 (rectifier input), Q2 (bypass input).

2.Open the circuit-breaker inside the battery cabinet.

To completely isolate the UPS, open the a.c. power supply circuit-breaker (both circuit breakers if separate supplies are provided for the rectifier and the bypass supply) and thee output circuit breaker on the power distribution switchboard.

If individual UPS output isolation circuit-breaker (and its auxiliary contacts) are not installed on the power distribution switchboard, remember that voltage supplied by the others UPS which remains in service still will be present on the output terminals of the shutdown UPS.

WARNING

If individual UPS output isolation circuit-breaker are not installed on the power distribution switchboard, remember that voltage supplied by the others UPS remains in service will still be present on the output terminals of the shutdown UPS.

Warning : Wait 5 minutes for the internal d.c. busbar capacitors to discharge.

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