Alpha Technologies Spectra Series - Manual (Page 20)

Preliminary Operating Instructions 20 of 62 AIP SERVICE NUMBER 1-800-863-3364
If the charger was shipped from the factory with the optional Remote Voltage Sensing cable, it will have
the sensing wires installed into the correct terminal strip and have the resistors moved to the correct
location. If this option is added later, installation instructions on how to wire it will be included.
8.1.1 WIRING THE REMOTE DC VOLTAGE CABLE
With both AC and DC de-energized follow the procedure below:
1. Place the RED and BLACK wires that are coiled up inside the charger through one of the spare
knockouts provided on the DC side of the enclosure. See SECTION 6.3. Do not place in the
same knockout as either the AC input or DC output wiring. Protect the wires to ensure the sharp
edges of the opening will not damage the wire. It is recommended to place a fuse in-line with the
cable near the battery connection in case the wires would get shorted together.
2. Securely connect the RED wire to the POSITIVE of the battery or DC bus.
3. Securely connect the BLACK wire to the NEGATIVE of the battery or DC bus.
4. Wire tie the cables so they can not be pulled loose.
5. After the charger is fully installed, connect the DC bus to the charger. Verify the voltage on the
display corresponds to the actual battery voltage. If so, the charger is ready for service.
For wiring diagram of this option, see FIGURE 8.1.1.
FIGURE 8.1.1: CHARGER VOLTAGE SENSING WIRING DIAGRAM
Torque all connections to 9 inch pounds (1Nm).
8.1.2 REMOVING REMOTE VOLTAGE SENSING CABLE
When removing Remote Voltage Sensing Cable both AC and DC will need to be de-energized.
Reference FIGURE 8.1.1 for proper placement of wires and R3 resistors.
8.2 REMOTE TEMPERATURE SENSING CABLE
This option will allow the charger to adjust the charging voltage to compensate for the temperature of the
batteries. The temperature of the battery will be closely monitored by the sensor and the float and
equalize voltages will be adjusted accordingly. The remote temperature sensing cable has a
temperature sensor that needs to be mounted to the battery post for accurate battery temperature
sensing.
Temperature compensation is based on a reference temperature of 77°F (25°C). The Temperature
compensation factor is - 2.5 mV (millivolts) per Cell per Degree F (- 4.5 mV per cell per Degree C). The
compensation factor is NEGATIVE because of the inverse relationship between the temperature and the
voltage (i.e. as the temperature increases the voltage should decrease).