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18 User Guide APC Silcon 480kW 400V UPS
990-4041
Stop/Start UPS and Operating the External Service Bypass
2.7.2 Switching Back the UPS to Normal Rarallel/Redundant Operation
The UPS will automatically switch to normal operation and start load-sharing with the other
parallelled UPS(s).
Action
1. Set the input switch (Q001) and the output switch (Q002) to position 1.
2. Charge capacitors, connect battery, and start up the UPS as described in 2.4.1. Start UPS
(from complete power down).
WARNING!
The system will discharge built-in capacitors.
ALWAYS check with a multimeter that the terminals contain no dangerous voltage before
touching the system!
NOTICE!
With Q002 in position 0, the UPS can be operated and tested as a single system without affecting
the other parallel UPS(s) if correct monitoring device has been installed. Applicable to all bypass
panels.