Maruson MBS-610RM User manual

1. Introduction
The module is used as an external maintenance bypass switch to provide continuous
power without shutting down the connected loads during UPS scheduled maintenance
or battery replacement. It’s perfect to use in conjunction with 6K/10K VA UPS.
Rack Mount the Unit
The module can be mounted to a 19” enclosure. Please follow below chart
for rack mount installation.
2. Product Overview
Diagram 1: Rear panel View Diagram 2: Terminal overview
Input/Output terminal Output terminal
(Refer to diagram 2 for the details) UPS output terminal
UPS input breaker UPS input terminal
Maintenance bypass switch Utility input terminal
Control output signal slot Grounding terminal

3. Installation and Operation
Inspection
Unpack the package and check the package contents. The shipping package contains:
Maintenance bypass switch module x 1
Quick guide x 1
Control signal cable x 1
NOTE: Before installation, please inspect the unit. Be sure that nothing inside the
package is damaged during transportation. Do not turn on the unit and notify the
carrier and dealer immediately if there is any damage or lacking of some parts.
Please keep the original package in a safe place for future use.
Initial Setup
The Installation and wiring must be performed in accordance with the local electric
laws/regulations and execute the following instructions by professional personnel.
1) Make sure the mains wire and breakers in the building are enough for the rated
capacity of UPS to avoid the hazards of electric shock or fire.
NOTE: Do not use the wall receptacle as the input power source for the UPS, as its
rated current is less than the UPS's maximum input current. Otherwise, the receptacle may be
burned and destroyed.
2) Switch off the mains switch in the building before installation.
3) Turn off and shut down the connected UPS.
Maintenance
Bypass Switch Module
Quick Guide
V. 1.1

4) Prepare wires based on the following table:
UPS Model
Wire Spec (AWG)
6K/6KL
10
10K/10KL
8
NOTE 1: The cable for 6K/6KL should be able to withstand over 40A current. It is
recommended to use 10AWG or thicker wire for safety and efficiency.
NOTE 2: The cable for 10K/10KL should be able to withstand over 63A current. It is
recommended to use 8AWG or thicker wire for safety and efficiency.
NOTE 3: The selections for color of wires should be followed by the local electrical laws and
regulations.
5) Remove the terminal block cover on the rear panel of the module. Then connect the wires
according to the following terminal block diagrams:
Connect UPS and External Maintenance Bypass Switch Module
Remove the terminal block cover on the rear panel of the module. Then connect output
terminals of UPS to output terminals of switch module. Connect utility input terminals of UPS
to UPS input terminals of switch module. Connect signal slots of UPS and switch module with
control signal cable attached to the package.
Refer to the following terminal block diagrams:
NOTE : Make sure that the wires are connected tightly with the terminals.
Put the terminal block cover back to the rear panel.
4. Operation
Transfer to Maintenance Bypass
To transfer to maintenance bypass from UPS, follow the below steps:
Step 1: Press “OFF” button of UPS unit to transfer to bypass mode.
Step 2: Open the maintenance switch cover. If step 1 is not executed first, then UPS unit will
transfer to bypass mode automatically with control output signal connection when opening the
maintenance switch cover.
Step 3: Transfer rotary switch to “BPS” position and switch off UPS input breaker on the
module. Then, all devices are directly powered by utility and there is no current through the
UPS. The output and input of UPS are isolated from the system. You may now service or
maintain the UPS by shutting down the batteries of UPS.
Transfer to UPS Protection
After maintenance service is done, follow below steps to transfer back to UPS operation.
Step 1: Switch on the input breaker of the module and reconnect UPS battery input breaker.
Then UPS will enter to bypass mode.
Step 2: Transfer rotary switch to “UPS” position. Then, all devices are powered by utility
through UPS bypass mode.
Step 3: Close back maintenance switch cover and press “ON” button of UPS unit. Then, all
devices are protected by the UPS.
NOTE: If maintenance will be executed in another place, before removing the UPS and the
module, please follow steps of “Transfer to Maintenance Bypass” and then disconnect all wires
between UPS and the module for complete isolation.
5. Specification of Critical Components
Parameter
Max.
Input breaker
Current
63 A
Voltage
250 V
Bypass switch
Current
63 A
Voltage
690 V
Input/Output terminal
Current
60 A
Voltage
600 V
UPS
Maintenance
Bypass Switch
Module
Ground
Ground
Output Line
Output Neutral
Ground
Input Neutral
Input Line