Lowell Manufacturing Co.
UPS-XBDM-20RCD User Manual
Page 6
Bypass Distribuon Module
Introducon
The informaon provided in this manual covers single phase 20A bypass distribuon module, its basic funcons,
operang procedures, opons available and emergency situaons. It also includes informaon on how to ship,
store, handle, and install the equipment. Only detailed requirements of the XBDM units are described herein, and
installaon must be carried out in accordance with this manual. Refer to the associated UPS manual for UPS oper-
ang instrucons. Electrical installaon must also carefully follow local legislaon and regulaons. Only qualied
personnel should conduct these installaons as failure to acknowledge electrical hazards could prove to be fatal.
Product Descripon
Many dierent kinds of sensive electrical equipment can be protected by an Uninterrupble Power Supply (UPS)
including computers, workstaons, process control systems, telecommunicaons systems, sales terminals, other
crical instrumentaon, etc. The purpose of the XBDM is to provide an extra level of protecon in allowing for the
replacement of a UPS without powering down the loads connected. The XBDM can work with most single phase
topologies. It will not work with topologies that have a phase shi between input and output (like ferro of UPS
with an isolaon transformer).
Electrical interference exists in many forms, causing problems in AC power, from lightning, power company ac-
cidents and radio transmission motors, air condioners, and vending machines. Protecon of sensive electrical
equipment is vital to protect against power outages, low or high voltage condions, slow voltage uctuaons,
frequency variaons, dierenal and common-mode noise, transients, etc.
To prevent power line problems from reaching crical systems causing damage to soware, hardware, and equip-
ment malfuncons, the UPS maintains constant voltage, isolang crical load output and cleaning the ulity AC
power. When a UPS fails or needs maintenance, many mes it is necessary to turn o the UPS and disconnect it
from incoming electrical circuits. With the XBDM installed between the incoming Ulity and the UPS, you can re-
place the UPS and/or Baeries without dropping the load. You simply switch the XBDM from UPS power to Ulity
power and remove the UPS while the load connected to the XBDM connues to operate temporarily from Ulity
power.
Bypass Distribuon Descripon
The Xtreme Bypass Distribuon Module (XBDM) is designed to operate with a single-phase UPS up to 20Amps in
output capacity. The XBDM allows you to:
• Replace or upgrade the UPS without losing power to the protected equipment
• Provide surge protecon if the UPS is not present
• Provide extra surge protecon when the UPS is present
As shown in the block diagram below:
• Under normal operaon, the UTILITY INPUT ows through the XBDM to the UPS and then out to the CON-
NECTED LOADS.
