ANNEXE 2. Flexa Manual Bypass (MBP)
The purpose of this document is to provide guidelines for customers to implement, assemble, wire and test external
manual by-passes using CE+T Flexa modular UPS’ with T4S monitoring units.
The CE+T delivered cabinets equipped with manual by pass are not concerned by this document.
2.1. Introduction
The purpose of the Manual Bypass also named “service by pass” is to provide the capability to completely by-pass the
modular UPS Flexa system and SBP in order:
•
To perform service maintenance to the equipment
•
To externally by-pass the UPS installation and allow the removal of the equipment
2.2. Principle of operation
The manual by-pass (MBP) is a “make before break” Bypass manual switch.
The MBP can be in 3 position mode:
OFF or NORMAL:
The MBP is not engaged (OFF) and the USP normally feeds the critical load.
INTERIM or TRANSFER:
The MBP is in a temporary interim position where the AC load is supplied through the
manual by-pass. The Flexa UPS is in start up mode and not yet connected to the AC
output.
ON or BY PASS:
The MBP is engaged, the AC input feeds the AC load, the UPS modules are OFF.
Disconnect DC source to turn OFF the system completely. (Note: Flexa Module auxiliary
power supply and monitoring are still power up by DC source once MBP is engaged)
Warning: If MBP is engaged, the neutral connection is not isolated and not voltage free.
Block wiring of the MBP
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Summary of Contents for FLEXA 200 400/400
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