Mastervolt MLI Ultra Series User Manual

Run the main positive battery cable
from the charger side of the system
to the B (right) side terminal of the
ML switch.
Connect the negative cable as
described in the user manual of the
MLI Ultra.
Remove the clear fuse cover and
install the T-fuse (
1). Place the
cover back on the fuse holder.
Close the side handle as much as
possible (2). It will not close
completely.
Put the Battery Safety Connector
back in place (
1).
On the ML Switch, set the safety
relay knob to “LOCK OFF” (2).
Check all wiring and connections.
Make sure all joints are secure,
including the plate joints.
On the Battery Safety Connector,
move the jumper wire to pins 4 & 8.
Connect the ML Switch wires to the
Battery Safety Connector according
to the detailed figures in the user
manual of the MLI Ultra.
MLI Ultra 2750
MLI Ultra 5500
From the MLI Ultra, remove the
Battery Safety Connector (
1) and
on either side the bolt closest to
the positive terminal (2). Tilt the
positive (right) side handle (3).
Secure the busbar conductor on
the bracket to the positive terminal
of the MLI Ultra.
Place the bracket over the MLI
Ultra (
1), aligning the bracket holes
with the holes of the bolts.
Tighten the bolts back in place (2).
Always dimension cables
according to the application and
local rules and regulations.
Required tools & material
- 13mm / ¹⁄2" socket wrench;
- 2mm / ¹⁄16" flatblade
screwdriver.
- size 3 allen key;
- Torque wrench;
- T-Fuse;
use a fuse that matches the
applied wire size.
Single/paralell
connection
14.7 to 19.6 Nm
(130 to 170 In.Lbs)
3.5 Nm max
(31 In.Lbs)
15.5 Nm max
(140 In.Lbs)

Mastervolt MLI Ultra Series Specifications

General

Series	MLI Ultra Series
Category	Relays
Protection	Overload, short circuit, over temperature
Weight	Varies by model
Current Rating	500 A
Operating Temperature	-20°C to +60°C
Humidity Range	5% to 95% non-condensing
Communication	MasterBus
Voltage Range	12 V, 24 V