Specialty Concepts SC3/15 - Manual (Page 12)

O P T I O N S
Options can not be added to finished units.
OPTION A - Temperature Compensation:
DESCRIPTION: On units equipped with temperature compensation, a small sensor on a ten foot cable
is wired into the controller to adjust the charging thresholds according to battery temperature. The
rate of compensation is -5mv/
°
C per battery cell in series from 25
°
C. (See TABLE 1 below)
WHEN NEEDED: Temperature compensation is recommended for stand alone systems with sealed
batteries, or for systems that have no regular charging source other than PV AND where prolonged
temperature extremes will be experienced during periods of charging. Temperature extremes
would be when the battery will be exposed to average temperatures below 50
°
F (10
°
C) or above
90
°
F (32
°
C). Systems with other sources of charging, (alternators on RVs) or applications where
the battery is on maintenance charge, normally do not need this option.
CAUTION: SENSOR CABLE: If the sensor is damaged or the cable is cut, the controller will no longer
function.
INSTALLATION INSTRUCTIONS
Provision must be made to attach the sensor unit to the battery. This must be done properly to insure
that accurate temperature readings are made. It is important that ambient temperature not influence
the sensor. To minimize this, attach the sensor to the battery as follows:
1. RUN SENSOR TO BATTERIES: Run the sensor to the batteries, taking care to prevent damage to
the actual sensor itself. When pulling the sensor through conduit, do not pull on the rubber-coated
sensor, but instead on the gray cable just behind the sensor. Do not force the sensor. The sensor
itself is made of glass, but it is encased in an aluminum tube, then coated with plastic. If the tube
should pull off of the glass sensor, and if the sensor is not damaged, the tube can be slipped back
over the sensor.
2. ATTACH SENSOR: Use the adhesive sided foam pad (included) to cover the sensor (the plastic
coated unit at the end of the cable) and attach it to the side of the battery approximately half-way
up the side of the battery. Choose a battery that is shielded from drafts or sunlight by other
batteries or by the battery shelter. DO NOT immerse the sensor directly in the battery's electrolyte.
Temperature compensation of charging voltage is now automatic.
TABLE 1 : Voltage set-points by temperature.
Temperature compensation coefficient is: -.03 volts /
°
C from 25
°
C.
SC3/15 TEMPERATURE
°°
C (
°°
F)
VOLTAGE 0 (32)
°°
10 (50)
°°
20 (68)
°°
25 (77)
°°
30 (86)
°°
40 (104)
°°
50 (122)
°°
12 VOLT 15.15 14.85 14.55 14.40 14.25 13.95 13.65
OPTION E - Low-Voltage Load Disconnect (LVD) \ Generator Start:
This option provides a relay that can be used as a switch to automatically disconnect loads or start a
standby generator at a low-voltage condition of the battery. Connection to the N/O, Common and N/C
connections is via three wires The relay activates at about 11.5 volts and de-activates at about 13.0
volts. For generator start function, the generator must be equipped with a two wire auto-start feature.
Low-Voltage Load Disconnect: - To use this option, choose the white wire labeled “1” (common)
and connect it to the battery (+) and connect the white wire labeled “2” (normally closed) to the
Load (+). Connect the load (-) to battery (-) terminal. The white wire labeled “3” (normally open) is
not used. Be sure to insulate the end of the wire, as it will be “hot”. (See wiring diagram, FIGURE 2
and INSTALLATION INSTRUCTIONS - #16. OPERATION) )
Generator Start: - To use this option, choose the white wires labeled “1” (common) and “3” (normally
open) and connect them to the generator auto-start circuit. The generator and loads would connect
directly to the battery. The white wire labeled “2” (normally closed) is not used