Specialty Concepts SCS/90 - Manual (Page 11)

C I R C U I T B R E A K E R S
LOAD CIRCUIT BREAKER : - A 15 amp load circuit breaker is included with the SCS. This
provides over-current and short-circuit protection for the load and can be used as an on/off
switch for the load.
ARRAY CIRCUIT BREAKER : - A 50 amp array circuit breaker is included with the SCS. This
provides over-current and short-circuit protection for the SCS from the array and can be
used as an on/off switch for the array in order to stop additional charging.
BATTERY CIRCUIT BREAKER : - A 50 amp battery circuit breaker is included with the SCS.
This provides over-current and short-circuit protection for the SCS from the battery. This
breaker can be used in conjunction with the ARRAY and LOAD breakers to remove the
power sources in the system. To remove all power to the SCS, all three circuit breakers
must be turned off. To provide power to the load only, turn ARRAY and BATTERY
breakers off (LOAD breaker on). The ARRAY breaker should be switched off whenever the
BATTERY breaker is off to stop the internal relay from oscillating. When turning the
breakers back on, be sure to turn on the Battery switch first and then the Array and Load
switches. This will assure the loads will come on immediately.
V O L T A G E A L A R M S
ALARM LIGHTS The "HIGH ALARM" and "LOW ALARM" lights will indicate any abnormal
battery voltages. The voltage set-points for these alarms can be adjusted by using the two
access holes labeled "Alarm Adjust”". The alarm relays operate in conjunction with the
alarm lights.
ALARM RELAYS High and low-voltage alarm relays give separate dry contact relay closures
for high and low voltage conditions. The low alarm is a normally closed contact, being
energized at normal operating voltages and closing on low voltage to provide a signal in
the event of a complete battery failure. The high alarm is a normally open contact. Each
relay is rated at 10 amps, and consumes 30 milliamps when energized. Access to the
contacts is via a terminal block on the front plate.
ALARM CONTACTS / INSTALLATION Wire to the terminal strip below the display. Small
gauge wire can be used.
MODIFYING THE ALARM VOLTAGES:
a. Refer to the 3 sets of pins in the ALARM CALIBRATION window on the front plate.
Put the SCS into Program Mode by installing the Programming Jumper across
PROG MODE pins (center two pins).
b. Set the MONITOR FUNCTION SELECT knob to “AUX CURRENT” (position 3).
Note: If the AUX CURRENT position is currently being used to monitor an auxiliary
current using an external shunt, it has to be temporarily disconnected to free up the
display for the alarm calibration. Access the rear of the front plate and disconnect
the two wires from the external shunt where they are connected to the display
circuit board. After the alarm calibration, this connection can be replaced.
c. For Low-Voltage Alarm: Place a Programming Jumper across the LOW ALARM pins
d. With a small screwdriver, turn the LOW ALARM Adjust dial and set the new voltage
set-point as indicated on the display.
e. For High-Voltage Alarm: Repeat the above two steps using the HIGH ALARM pins
and the HIGH ALARM Adjust dial.
f. When finished, place the Programming Jumpers back into their storage positions
(attached to only one pin). Reconnect AUX CURRENT wires, if needed.