OEM Controls SB25 - Manual (Page 12)

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Power may be supplied by the machine or by using a fresh 9 Volt transistor radio battery.
Connect the battery plus to the red wire, and the battery minus to the black wire. One or
both LEDS should be on. If neither LED turns on, replace the Digisensor.
Next, rotate the Digisensor’s potentiometer shaft. When it is turned fully counter-
clockwise, the left “direction A” LED turns on. When the shaft is turned fully clockwise,
the right “direction B” LED turns on. There is a small area when the potentiometer shaft
is turned about halfway where both LEDS are on. This is important for aligning the
Digisensor to the Joystick controller.
Whenever a Digisensor is mounted to a joystick controller, the mechanical alignment
must be checked and adjusted if necessary. This is important as the SB25 Controller
depends on proper Digisensor signals to operate the valves. Check the Digisensor LEDS
when the Joystick handle is in its center or “off” position. NOTE - it may be necessary to
operate the joystick’s on/off micro-switch to apply power to the Digisensor. Both LEDS
must be ON when the handle is centered. If this is not the case, rotate the shaft until both
LEDS turn on, and then tighten all mechanical hardware.
5.4 System diagnostic LEDs
Four system diagnostic LEDs are found between BT1 and BT3. They indicate system
status. The system diagnostic LEDs have the following function:
• The BUS LED flashes whenever communications are occurring on the RS485
Communications Bus
• The OUTPUT LED flashes when any of the PWM Outputs are active. It will turn
off when all of the outputs are OFF (this may take several seconds if a long Ramp
Down time is used).
• The CPU LED flashes to indicate that the microprocessor (CPU) is operating
properly. If this LED is on constantly (not flashing) there is a CPU failure, and the
SB25 Controller must be replaced or repaired by OEM Controls, Inc.
• The INPUT LED flashes whenever one or more Digisensors are operated. This
LED is off if all Digisensors are off. If this LED remains off when a joystick is
operated, check the wiring, and make sure there is power to the joystick. This
LED will be on continuously (not flashing) if one of the Digisensor wires is
shorted to battery voltage.