Specialty Concepts SCS/90 - Manual (Page 6)

INSTALLATION INSTRUCTIONS (continued):
8. RUN SYSTEM WIRING: - After disconnecting the power sources, refer to wiring
diagram (FIGURE 1) and run the system wiring to the location of the SCS. The
wires should reach the location of the SCS with a little extra for strain relief loops.
9. NOTE WIRE POLARITY: - Insure that the polarity of the wires is correctly marked,
using colored wires or tags. Incorrect polarity should not damage the SCS, but
incorrect operation would result.
10. COMPLETE ARRAY AND BATTERY CONNECTIONS: - Connections to the SCS
terminal block should be made with just the bare wire (not crimped spade or ring
lugs unless the lugs are crimped AND soldered).
11. COMPLETE LOAD CONNECTIONS: - Refer to wiring diagram (FIGURE 1). DC
loads not exceeding the rated SCS load current (see specification section “Load
Current, Continuous”) can be connected to the load terminals of the SCS and they
will automatically be disconnected in the event of a low-voltage condition. Higher
current, or inductive loads such as pumps, motors or inverters should be connected
directly to the battery, using properly rated over-current protection devices (fuses or
circuit breakers).
12. BATTERY VOLTAGE SENSE CONNECTIONS: - The factory has installed two
jumpers onto the terminal block. They connect the "VOLTAGE SENSE" (positive
and negative) terminal to their respective "BATTERY" terminals. These jumpers
should remain in place if the SCS is located within 5-10 feet of the batteries and if
large enough wire is used to minimize voltage drops to less than 2%.
If the SCS is at a greater distance from the batteries and/or if the voltage drop in
the battery wires exceeds 2%, then the jumpers should be removed and replaced
with another circuit running directly to the battery terminals. This is a low current,
voltage sensing circuit that can be wired in 16 AWG wire. Proper over-current
protection should be added on the positive side. This connection will allow the SCS
to accurately measure battery voltage.
13. INSTALL FUSING AS NEEDED: - Add circuit protection where needed. A 50
amp fuse (SCS/50) or 90 amp fuse (SCS/90) should be installed on the Battery (+)
run of the SCS. Fusing is also advised for the battery voltage sense connection, if
included. The load is already protected by the built-in circuit breaker of the SCS.
14. ATTACH TEMPERATURE COMPENSATION CABLE: - SEE TEMPERATURE
COMPENSATION section
15. MAKE HIGH / LOW VOLTAGE ALARM CONNECTIONS: - See VOLTAGE
ALARMS section