32 | SAMLEX AMErICA INC.
SAMLEX AMErICA INC. | 33
DC Side Grounding Connector (5) is connected to the Earth ground / vehicle chassis
ground as per recommendations at Section 3.14.
3.5.1 Preventing DC input over Voltage
It is to be ensured that the DC input voltage of this unit does not exceed 17 VDC for the 12V battery
version EVO-2212E and EVO-3012E, and 35 VDC for the 24V battery versions EVO-2224E and EVO-4024E
to prevent permanent damage to the unit.
3.5.2 Preventing reverse Polarity on the input Side
!
CAution!
When making battery connections on the input side, make sure that the polarity of battery
connections is correct (Connect the Positive of the battery to the Positive terminal of the unit
and the Negative of the battery to the Negative terminal of the unit). If the input is connected
in reverse polarity, external DC fuse in the input side will blow and may also cause permanent
damage to the inverter.
Damage caused by reverse polarity is not covered by warranty.
3.5.3 Connection From batteries / external Charger to the DC input
Side – Sizing of Cables And Fuses
wArning!
the input section of the inverter has large value capacitors connected across the
input terminals. As soon as the DC input connection loop (battery (+) terminal
→
Fuse
→
Positive input terminal of eVo
TM
→
negative input terminal of the eVo
TM
→
battery (–) terminal) is completed, these capacitors will start charging and the unit will
momentarily draw very heavy current that will produce sparking on the last contact in
the input loop even when the unit is in powered down condition.
ensure that the fuse is inserted only after all the connections in the loop have been
completed so that sparking is limited to the fuse area.
flow of electric current in a conductor is opposed by the resistance of the conductor. The resistance
of the conductor is directly proportional to the length of the conductor and inversely proportional to
its cross-section (thickness). The resistance in the conductor produces undesirable effects of voltage
drop and heating. The size (thickness / cross-section) of the conductors is designated in mm
2
or by
AWG (American Wire Gauge). Conductors thicker than AWG #4/0 are sized in MCM/kcmil.
Conductors are protected with insulating material rated for specific temperature e.g. 90˚C/194˚f. As
current flow produces heat that affects insulation, there is a maximum permissible value of current
(called “Ampacity”) for each size of conductor based on temperature rating of its insulation. The
insulating material of the cables will also be affected by the elevated operating temperature of the
terminals to which these are connected. Ampacity of cables is based on british Standard bS7671.
Please see details given under “Notes for Table 3.1”.
The DC input circuit is required to handle very large DC currents and hence, the size of the
cables and connectors should be selected to ensure minimum voltage drop between the battery
and the inverter. Thinner cables and loose connections will result in poor inverter performance
SECTIOn 3 |
Installation
