PDU & Maintenance
2. Product Overview
Bypass Switch Module
Quick Guide
1. Introduction
The product is used as an external power distribution unit in conjunction with UPS systems
or large-scale voltage regulators. It allows to manually transfer the connected equipment to
utility power via a bypass switch, permitting scheduled maintenance or UPS replacement
without power interruption. Combined power distribution feature and the master-controlled
design, it provides maintenance bypass function and power saving within a rack
mechanism.
Rack Mount/Wall Mount the Unit
The module can be mounted to a 19” enclosure or wall. Please follow below chart for rack/wall
mount installation.
Wall
V. 2.0
Master output receptacle
(for connecting a computer)
Slave output receptacles
(for connecting peripherals)
Socket to UPS output
Socket to UPS input
Bypass switch
AC input
Circuit breaker
Master/Slave function switch
δ
Power LED
ε
Slave On LED
3. Installation and Operation
Inspection
Remove the unit from the shipping package and inspect it for damage that may
occur during transportation. Notify the carrier and place of purchase if any
damage is found. The shipping package contains:
Maintenance bypass switch module x 1
Quick guide x 1
Mains power cord x 1
Screws and mounting ears
Connect to the Wall Outlet
Plug the input power cord of the unit to the wall outlet. The Power LED will light up when the
mains is normal. The Power LED will be off while power failure.
Chart 1: Rack mounting Chart 2: Wall mounting
Connect UPS
Monitor
Printer
16A/10A
Connect a power cord from UPS input to UPS input socket on the unit. Use one power cord to
connect UPS output to UPS output socket on the unit.
Online UPS
16A/16A or
Connect Equipment
There are two types of output receptacles: Master, and Slave.
To save power consumption, the unit is equipped with Master and Slave output receptacles.
The Master output receptacle will sense if master device (computer) is on. If the master
device is no longer drawing current, it will automatically shut down the power to the Slave
output receptacles. Please refer to below charts for detailed equipment connection.
Plug computer into Master Output Receptacle
Plug peripherals into Slave Output Receptacle
NOTE: When the computer is turned off, the Master output receptacle shuts off power to the
slave output receptacles. However, when the computer goes into “sleep mode” or the power
consumption of connected device to Master output receptacle is below 20 W, the Master
output receptacle may not properly recognize the reduced power level.
Computer
Switch
4. Operation
Transfer to Maintenance Bypass
Before transferring to maintenance bypass, make sure the Power LED is lighting. Transfer
the rotary bypass switch from “Normal” to “Bypass”. At this time, all connected devices are
powered by the utility power directly. You may turn off the UPS and disconnect two cables
connecting to UPS. Then you may now service the UPS.
Transfer to UPS Protection
After maintenance service is done, make sure the UPS operation is normal. Then, reconnect
UPS to the unit by following Installation Section. Verify the Power LED is lighting. Then
transfer the rotary bypass switch from “Bypass” to “Normal”. Now, all connected devices are
protected by UPS.
Master/Slave Function Operation
After connecting all devices to the unit, press “Master/Slave switch” to enable status ( ).
The Slave On LED will light up when connecting load on master output is above 20W. Press
“Master/Slave switch” to disable status ( ), the function is disabled and the Slave On LED
will be on.
Status & Indicator Table
1. Utility is normal.
2. Utility fails but UPS is providing power.
Utility fails Power LED (Green) off
Master/Slave function is enabled and the
connecting load on master output is above 20W.
Master/Slave function is enabled and the
connecting load on master output is below 20W.
Master/Slave function is disabled. Slave on LED (Yellow) on
Status Indicator
Power LED (Green) on
Slave On LED (Yellow) on
Slave On LED (Yellow) off
5. Important Safety Warning (SAVE THESE INSTRUCTIONS)
To safely operate this unit, please read and follow all instructions carefully.
Read this manual thoroughly before attempting to unpack, install, or operate.
You may keep this quick guide for further reference.
CAUTION: The product must be used indoor only.
CAUTION: Do not place the unit near liquid or in an excessively damp environment.
CAUTION: Do not place the product directly in the sun or near a hot source.
CAUTION: Do not let liquid or foreign objects enter the product.
CAUTION: Ground the product using a 2P + ground sockets.
CAUTION: When installing the product, ensure that the sum of the leakage currents of the
product and the devices it supplies not exceed 3.5mA.
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