
SAMLEX AMERICA INC. | 41
SECTION 8 |
Installation
the diversion load may damage the battery as well as the inverter or other DC loads connected to the
battery due to high voltages generated during conditions of high winds (for wind generators), high
water flow rates (for hydro generators). It is, therefore, to be ensured that the diversion load is sized
correctly to prevent the above over voltage conditions.
- These units are designed to operate from Lead Acid Battery System with nominal voltage of 24 VDC
for PSR-1200-24 and 48 VDC for PSR-1200-48. Do not operate these units from battery system voltage
higher/lower than the above nominal voltages.
8.4.2 Preventing Reverse Polarity on the DC Input Side
!
CAUTION!
Damage caused by reverse polarity is not covered by warranty! 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, DC fuse(s) inside the
inverter will blow and may also cause permanent damage to the inverter.
8.4.3 Connection from Batteries to the DC Input Side – Sizing of Cables and Fuses
!
CAUTION!
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
Ò
External Fuse
Ò
Positive input terminal
of the Inverter
Ò
Negative input terminal of the Inverter
Ò
Battery (–) terminal) is completed, these
capacitors will start charging and the unit will momentarily draw very heavy current to charge these
capacitors that will produce sparking on the last contact in the input loop even when the unit is in
OFF 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-sec-
tion (thickness). The resistance in the conductor produces undesirable effects of voltage drop and heating.
The size (thickness / cross-section) of the conductors is designated by AWG (American Wire Gauge). Conduc-
tors thicker than AWG #4/0 are sized in MCM/kcmil. Table 8.1 gives Resistance in Ohm (Ω) per Foot at 25°C /
77°F for the wire sizing recommended for use with this inverter.
TABLE 8.1 WIRING RESISTANCE PER FOOT
WIRE SIZE, AWG
RESISTANCE IN OHM (Ω) PER FOOT AT 25°C / 77°F
AWG#8
0.0006405 Ω per Foot
AWG#3
0.0002009 Ω per Foot
AWG#2
0.0001593 Ω per Foot
Содержание PSR-1200-24
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