InteliLite4 AMF20 Global Guide
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For the connections with 12 V DC power supply, the controller includes internal capacitors that allow the
controller to continue in operation during cranking if the batter voltage dip occurs. If the voltage dip goes to 0 V
during cranking and after 50 ms it recovers to 4 V, the controller continues operating. This cycle can repeat
several times. During this voltage dip the controller screen backlight can turn off.
Note:
Recommended fusing is 4 A fuse.
Note:
In case of the dip to 0 V the high-side binary outputs will be temporarily switched off and after
recovering to 4 V back on.
IMPORTANT: When the controller is powered up only by USB and the USB is disconnected then
the actual statistics can be lost.
Note:
Suitable conductor protection shall be provided in accordance with NFPA 70, Article 240.
Note:
Low voltage circuits (35 volts or less) shall be supplied from the engine starting battery or an isolated
secondary circuit.
Note:
It is also possible to further support the controller by connecting the external capacitor and separating
diode. The capacitor size depends on required time. It shall be approximately thousands of μF. The capacitor
size should be 5 000 μF to withstand 150 ms voltage dip under following conditions: Voltage before dip is
12 V, after 150 ms the voltage recovers to min. allowed voltage, i.e. 8 V. Diode should be able to withstand at
least 1 kV.
Power supply fusing
The controller should never be connected directly to the starting battery. A 4 A fuse should be connected in-
line with the battery positive terminal to the controller and CAN modules. Fuse value and type depends on the
number of connected devices and wire length. Recommended fuse (not fast) type – T4 A. Not fast types are
recommended due to internal capacitors charging during power up.
IMPORTANT: 4 A fuse is calculated without BOUT consumption nor extension modules. Real
value of fuse depends on consumption of binary outputs and modules.
4.4.5 Measurement wiring
Use 1.5 mm
2
cables for voltage connection and 2.5 mm
2
for current transformers connection. Adjust
,
Nominal Voltage Ph-N (page 211)
Nominal Voltage Ph-Ph (page 211)
,
,
and
to appropriate setpoints in the Basic Settings group.
