Specialty Concepts SCS/90 - Manual (Page 14)

O P T I O N S
OPTION H - GENERATOR START : The generator start option is for systems designed with
a stand-by generator that has an autostart circuit. A voltage-free contact closure is
provided to signal the generator to start and stop charging, based on battery voltage.
Access to the relay contacts is via a terminal block on the face plate. The start and stop
set-points are factory set at 11.5 volts start and 13.5 volts stop (for a 12 volt system) and
are adjustable. Adjustments are made via the pots labeled "SPAN ADJ." and “START
ADJ.” The range of adjustment for the start voltage is from 11.0 to 12.0 volts, and the
range for the stop is from 12.8 to 14.0 volts for a 12 volt system.
RECALIBRATION PROCEDURE FOR GENERATOR START SET-POINTS:
Equipment required : Power supply, variable, with sufficient voltage range for system
voltage (i.e. 0-15 volts for 12 volt system).
1. With battery sense jumpers in place, connect power supply positive to "BATTERY +"
2. Connect power supply negative to "BATTERY -"
3. Turn selector switch on the SCS face plate to "BATTERY VOLTAGE"
4. Vary power supply voltage in the area where the generator start is set, observing when
the red "GEN.START" light goes on and off.
5. Subtract value of desired start voltage from desired stop voltage.This becomes the
"SPAN" value.
6. Turning the "SPAN ADJ." pot clockwise increases the span. Turning it counter-clockwise
decreases the span.
7. Vary power supply voltage once again to determine new span value.
8. Repeat steps 6 and 7 until desired span is achieved. Start voltage set-point will be
incorrect.
9. Turning the "START ADJ." pot clockwise decreases the set-point, and turning it counter-
clockwise increases it.
10. Vary the power supply voltage to determine the new start value.
11. Repeat steps 9 and 10 until the desired start set-point is set.
12. Repeat step 4 to verify accuracy of new set-points.
OPTION W - POSITIVE GROUND LOAD : The Low-voltage Load Disconnect is in the
negative leg of the load circuit. Array connections should be floating (not grounded).
OPTION 3R - OUTDOOR ENCLOSURE (NEMA 3R) : This enclosure is intended for use
indoors or outdoors for rain proof applications.
OPTION 4X - OUTDOOR ENCLOSURE (NEMA 4X with Clear Door) : This enclosure is
intended for use indoors or outdoors for watertight, dust tight and corrosion-resistant
applications and provides a clear door for viewing metering and status lights without
opening the enclosure.