Specialty Concepts SCS/90 - Manual (Page 7)

16. AUX CURRENT CONNECTION (using external shunt): - If needed.
The SCS can be modified to allow the user to monitor a current to or from another
source, such as a charger or alternator or for monitoring loads such as a DC source
center or an inverter. This requires an external shunt to be added to the system and
connected to the circuitry behind the plate. Contact a technical representative for
information.
17. MAKE NEEDED ADJUSTMENTS TO SETTINGS: - See Setting/Adjustments
section
18. RECONNECT BATTERY AND ARRAY POWER - With the 3 circuit breakers in the
“OFF” position, reconnect both power sources. Then turn on the ”BATTERY” circuit
breaker first. After, the remaining two circuit breakers can be turned on.
19. OPERATION: - Operation of the charge controller is now fully automatic. If the
battery voltage is below the Full Charge Termination set-point (see
SPECIFICATIONS) and power is available from the array and the power connect
sequence (step #18) was followed, the SCS should start up in the charge mode. If
the battery voltage is above the Load Disconnect voltage, the loads connected to
the LOAD terminals should go on.
20. CHECK FOR VOLTAGE DROP (OPTIONAL): - Once the system is installed and
operational, a check on the battery connection is recommended. A poor battery
connection will result in a voltage loss that will cause the batteries to be under-
charged and/or result in excessive heat generated at the location of poor
connection (wire connection or terminal block). A voltage multi-meter is required
and the SCS must be charging with maximum expected charge current.
First, note the voltage at the battery terminals. Select the positive and negative
terminals that are used for the SCS connection. Then note the voltage at the SCS
terminals labeled “BATTERY (+)” and “BATTERY (-)”. Ideally, the difference in
voltage should be no more than
¼ volt. If the voltage drop is more, suspect crimp
connections that have not been soldered or loose terminals. If no location of voltage
drop is found, consider using larger wires or additional wires for your run and/or run
a separate wire for the Battery Sense connection. See “BATTERY VOLTAGE
SENSE CONNECTION” (see #12 above).