PowerTech MP3749 User Manual

16
INSTALLATION:
Step 4: Grounding
The MP3749 uses a common-negative controller. Negative terminals of
the PV array, the battery can be grounded simultaneously, or any terminal
is grounded. However, according to the practical application, the PV
array’s negative terminals, battery, and load can also be ungrounded.
Simultaneously, the grounding terminal on the shell must be grounded,
which eectively shields the electromagnetic interference from the
outside and prevents some electric shock to the human body due to the
electrification of the shell.
CAUTION
For common-negative systems, such as the RV system, it is
recommended to use a common-negative controller. If a
common-positive controller is used and the positive electrode is
grounded in the common-negative system, the controller may
be damaged.
Step 5: Connect Accessories
• Connect the remote temperature sensor cable
Connect the remote temperature sensor cable to the
interface ❽ and place the other end close to the battery.
CAUTION
Suppose the remote temperature sensor is not connected to the
controller. In that case, the controller can charge or discharge the
battery at the default 25 °C(no temperature compensation).
• Connect the remote battery voltage sensor cable
Connect the remote battery voltage sensor cable to the interface ⓫ and
connect the other end to the battery terminals.
• Connect the accessories for RS485 communication; refer to the
accessories list.
Step 6: Power on the controller
Close the battery’s fuse to power on the controller. After the LCD normally
displays, close the PV array’s circuit breaker. The charging indicator is slow
flashing during the PV charging process.
CAUTION
If the controller can not work properly or the fault indicator shows
an abnormality, please refer to the Troubleshooting Section.

PowerTech MP3749 Specifications

General

Brand	PowerTech
Model	MP3749
Category	Controller
Language	English