MBM INSTALLATION
Eaton 9395 Maintenance Bypass Module Installation and Operation Manual
S
164201719 Rev 3
www.eaton.com/powerquality
4-8
3.
If not already removed, remove the doors. Remove the retaining screws located
inside each door at the top and bottom hinge pivot points, then lift the door off.
Retain the hardware for later use.
4.
If not already removed, remove the screws securing the top and bottom internal
safety shield panels and remove the panels to gain access to the MBM
terminals. Retain the hardware for later use.
5.
Route the input and output cables through either the top or bottom of the cabinet
to the MBM terminals. See Figure 4‐8 through Figure 4‐12 for wiring access
information and terminal locations.
Top Access Wiring.
Remove the top conduit plate from the top of the MBM.
Identify all conduit requirements and mark their location. Drill and punch all
conduit holes in the top conduit plate prior to mounting on the MBM. Install the
conduit plate and install all conduit runs into the plate. Pull the wiring through the
conduit into the wiring area.
Bottom Access Wiring.
Remove the bottom conduit plate from the inside bottom
of the MBM. Identify all conduit requirements and mark their location. Drill and
punch all conduit holes in the bottom conduit plate prior to mounting on the
MBM. Install the conduit plate and install all conduit runs into the plate. Pull the
wiring through conduit into the wiring area.
6.
An MBM-to-UPS output wiring harness is supplied inside the MBM. Route this
harness through the wiring access in the side of the cabinets (see Figure 4‐5 and
Figure 4‐6) to the UPS output terminals. Refer to the applicable Eaton 9395
Installation and Operation manual listed in paragraph 1.7 on page 1-4 for UPS
cabinet terminal locations and termination requirements. See Figure 4‐8 through
Figure 4‐12 for wiring access information and terminal locations.
7.
Connect phase A, B, and C power wiring to the UPS output terminals. Connect
the Neutral (if required) to the UPS and MBM neutral terminals. See
paragraph 3.2.2 on page 3-5 for wiring and termination requirements.
NOTE
When installing an MBM, a minimum of two separate feeds with upstream feeder breakers, or a
single feed with two upstream feeder breakers, must be provided: one for the UPS or rectifier input breaker
(RIB) (if installed) and one for the maintenance bypass input. DO NOT use a single feed or a single feeder
breaker to supply both the UPS or RIB and the maintenance bypass. If a bypass input breaker (BIB) is installed
in the MBM and a single-feed UPS is being installed, a single feed to the maintenance bypass is acceptable
for supplying both the UPS and the bypass.
8.
Route the maintenance bypass input and neutral (if required) cables from the
utility source to the MBM bypass input and neutral terminals. See Figure 4‐8
through Figure 4‐12 for wiring access information and terminal locations.
9.
Connect phase A, B, and C power wiring to the MBM maintenance bypass input
and utility source terminals. Connect the Neutral (if required) to the utility source
and MBM neutral terminals. See paragraph 3.2.2 on page 3-5 for wiring and
termination requirements.
10.
Route the output and neutral (if required) cables from the MBM output terminals
to the critical load. See Figure 4‐8 through Figure 4‐12 for wiring access
information and terminal locations.
11.
Connect phase A, B, and C power wiring to the MBM output terminals and the
critical load. Connect the Neutral (if required) to the critical load and MBM neutral
terminals. See paragraph 3.2.2 on page 3-5 for wiring and termination
requirements.
