1. Uninterrupted Transfer: The static bypass transfer switch shall automatically cause the
bypass source to assume the critical load without interruption after the logic senses one of
the following conditions:
a) Inverter overload exceeds unit's rating
b) Battery protection period expired and bypass current is available
c) Inverter failure
2. Interrupted Transfer: If the bypass source is beyond the conditions stated below, the UPS
will make an interrupted transfer (not less than 100 mSec in duration).
a) Bypass voltage greater than + 10%, -10% from the UPS rated output voltage.
b) Bypass frequency greater than + 2 Hz from the UPS rated output frequency.
3. Automatic Uninterrupted Forward Transfer: The static bypass transfer switch shall
automatically forward transfer power, without interruption, after the UPS inverter is turned
"ON" after an instantaneous overload-induced reverse transfer has occurred and the load
current returns the UPS’s nominal rating or less.
4. Manual Transfer: A manual static transfer shall be initiated from the UPS Control Panel by
turning the UPS inverter off.
5. Overload Ratings: The static bypass transfer switch shall have the following overload
characteristics:
a) 1000% of UPS output rating for 0.016 seconds (one cycle)
b) 150% for 1 minute
c) 125% of UPS for 10 minutes
D. Output Static Switch – 100% Rated, Continuous Duty
UPS output shall be equipped with a 100% rated output static switch without mechanical
contactor device in parallel for higher reliability and consistent response time of 16.66 msec.
3.0 SYSTEM CONTROLS AND INDICATORS A. Microprocessor Controlled Logic
• The full UPS operation shall be provided through the use of microprocessor controlled
logic. All operation and parameters are firmware controlled, thus eliminating the need for
manual adjustments or potentiometers. The logic shall include a self-test and diagnostic
circuitry such that a fault can be isolated down to the printed circuit assembly or plug-in
power assembly level. Every printed circuit assembly or plug-in power assembly shall be
monitored. Diagnostics shall be performed via a PC through the local diagnostics port on
the UPS. UPS shall be microprocessor controlled
• The UPS will include a standard easy to use control and indicator panel. Included will be
a backlit, color graphic animated LCD display and LED indicators. The UPS panel will
include UPS “ON” and UPS “OFF” pushbuttons that will permit the user to safely
command the UPS on or off without risk of load loss.
• Display shall facilitate operation by offering the functions listed below.
o Operating information supplied on the screens.
APC – MGE Galaxy 5000 Specification (60Hz) 7 Effective: June 1, 2008 REV X0 JJG
Parallel Module