Maintenance Bypass Box
for Single UPS
Installation & Operation Guide
About this Guide
This guide contains information about installing and operating the
Delta Maintenance Bypass Box for Single UPS (MBB-S). Before you
install this unit, please read the safety instructions below.
Save these Instructions
This guide contains instructions and warnings that should be followed
during the installation, operation and storage of this product. Failure
to heed these instructions and warnings will void the product warranty.
This product is designed for indoor use only in a controlled
environment away from excess moisture, temperature extremes,
conductive contaminants, dust or direct sunlight.
• Do not connect the MBB-S to an ungrounded outlet or extension
cords or adapters that eliminate the connection to ground
• Do not use this equipment in the presence of flammable substances.
• The power requirement for each piece of equipment connected to
the MBB must not exceed the individual outlet's load rating.
• Do not drill into or attempt to open any part of the MBB housing.
There are no user serviceable parts inside.
• Do not modify the MBB-S.
• Do not use the MBB-S if any part of it becomes damaged.
• Never install electrical equipment during a thunderstorm.
Safety Precautions
To reduce the risk of personal injury from electric shock, you must
observe the following safety precautions when placing, installing,
operating, or performing maintenance on the Delta MBB-S.
Warnings!
•
Elevated Operating Ambient
- If installed in a closed or multi-unit
rack assembly, the operating ambient temperature of the rack
environment may be greater than room ambient. Therefore,
consideration should be given to installing the equipment in an
environment compatible with the maximum ambient temperature
(Tma) specified by the manufacturer.
•
Reduced Air Flow
- Installation of the equipment in a rack should
be such that the amount of air flow required for safe operation of the
equipment is not compromised.
•
Mechanical Loading
- Mounting of the equipment in the rack
should be such that a hazardous condition is not achieved due to
uneven mechanical loading.
•
Circuit Overloading
- Consideration should be given to the
connection of the equipment to the supply circuit and the effect that
overloading of the circuits might have on over-current protection and
supply wiring. Appropriate consideration of equipment nameplate
ratings should be used when addressing this concern.
•
Reliable Earthing
- Reliable earthing of rack-mounted equipment
should be maintained. Particular attention should be given to supply
connections other than direct connections to the branch circuit (such
as use of power strips).
Precautions for Rack Mounting
Delta strongly recommends that you do not perform maintenance on
the MBB-S if it is receiving input power.
• To reduce your risk of personal injury by electric shock, you must:
• Be a certified electrician trained in live electrical installation
• Always work with another qualified person
• Know how to disconnect electricity to the MBB and data center in
case of emergency
• Wear the right protective equipment
• Use double-insulated tools
• Strictly follow local and site regulations
Maintenance with Input Power
This is a Class A product. In a domestic environment this product may
cause radio interference in which case the user may be required to
take adequate measures.
Electromagnetic Interference
The Delta Maintenance Bypass Box for Single UPS (MBB-S) lets you
isolate a single UPS from the load without interrupting power to
essential applications. This allows you to perform scheduled UPS
maintenance or UPS replacement without disrupting power.
The MBB-S easily transfers power between normal and bypass mode
using a rotary switch.
1. MBB-S Overview
The Delta MBB-S package should contain the following items:
2. Package Contents
3. Installing the MBB-S
CAUTION:
• A licensed electrician must install the Delta MBB-S.
• The UPS unit must be switched off and unplugged before
installation.
• Install a utility circuit breaker for input wiring.Refer to the drawing &
table below.
Quantity
Item
1pcs
MBB-S
1set
Fixing Plate
1set
Ear bracket
1pcs
Parallel Cable
1pcs
MBB-S Installation & Operation Guide
4pcs
Cable gland
12pcs
Terminal
System
Voltage
Current Full
Load Nominal
External Input Circuit
Breaker Typical
Wire Size
Typical (mm
2
)
Input
Output
Input
Output
For
5/7k
UPS
For
9/11k
UPS
For
5/7k
UPS
For
9/11k
UPS
MBB-S
200/208/220/
230/240Vac
1Phase
50A
40A
2Pole
63A
2Pole
8
10
Remark: The External Input Circuit Breaker must use the components
approved for its safety certification.
4. Fixing the MBB-S
4-1. Tower Configuration
1. Place the MBB-S on the top rear of the UPS unit.
2. Locate and align the fixing holes on the MBB-S and UPS unit.Use
a screwdriver to fasten the fixing plates with the provided screws
and attach the MBB-S to the UPS unit.
3. Place the UPS and MBB-S in the upright tower position and secure
the mounting feet.
4-2. Rack-mount Configuration
1. Attach the mounting brackets to the MBB-S using the M4*6mm
screws that came with the brackets.
2. Choose a location in the rack for the MBB-S.
3. Install the MBB-S on your rack using the screws and cage nuts.
(The screws and cage nuts are provided with the rack frame.)
Fig. 2
5. Making Connections
The steps below show you how to connect power cables so the path
of AC power flows through the MBB-S to the UPS, or alternately,
bypassing the UPS and directly to the connected load.
Fig. 3
5-2. Attach the cable glands to the cable entry boxes. Insert the
cables through the cable glands and then insert the leads of the
cables into the terminal blocks and fasten screws. See Fig. 4.
Fig. 4
5-1. Unscrew and remove the cable entry boxes on the MBB-S.
See Fig. 3.
(The mounting feet are provided with the UPS or from a dealer.)
Fig. 1
MBB-S
x8
x6
x4
x4
UPS OUTPUT
LOAD
UPS INPUT
AC INPUT
