OEM Controls SB25 - Manual (Page 10)

10
Attempt to make the SB25 the closest device connected to the battery. This
guideline must be followed for BOTH the + and – connections.
• The SB25 is configured to operate with EITHER a +12 volt system power (10 –
16V) or a +24 volt system power (20 – 32V). Circuit components differ for the
two voltage levels and therefore the configuration is different for each voltage
level.
4.2.2 Input Devices
4.2.2.1 Digisensor based input devices
Two wires connect the Digisensor to the system. The Digisensor’s Red wire connects to
the +12Vor +24V system power. The system power for the Digisensor does not need to
be wired directly to the SB25, but it must be at the same voltage level as the +V for the
SB25 and it must be referenced to the same ground. The Black wire carries the
Digisensor’s electrical signal and connects to one of the SB25’s Digisensor Inputs.
4.2.2.2 Digital Inputs
Devices driving Digital Inputs, typically a switch to +V system power, must connect +V
system power to turn the Digital Input ON and either connect ground or an open circuit to
turn the Digital Input OFF. Devices that drive Digital Inputs must be capable of driving
the low current levels (20mA).
4.2.3 Output Devices
Outputs are controlled by the particular application’s software program that is built into
the SB25. The function of various terminals is dependent on the application. Refer to the
cover label for the proper BT connector location for each device.
4.2.3.1 Electrohydraulic Valves
The SB25 drives Electrohydraulic Valves with its PWM outputs. The SB25 PWM
outputs are connected to the plus side of the valve. Connect the minus side of the valve
to battery ground. The ground used for the valve must be at the same voltage as the
ground used for the SB25 Power Supply – connection.
5 Troubleshooting
The SB25 System has been designed to perform in the harsh environments of the mobile
equipment industry. Most of the common problems encountered are external to the SB25
Controller. Problems may include: broken wires, loose or corroded or defective
connections, wiring errors, wiring shorts, and improper power supply voltages. The
SB25 Controller has several built in features that can assist with testing and
troubleshooting your system.
Check for the following machine related problems:
• Power is turned on and supplied to the SB25. Supply voltage is OK (batteries
aren’t weak).
• Make sure all cables and wiring are connected properly.