OEM Controls SB25 - Manual (Page 9)

9
4 Installation
4.1 Mounting
The SB25 Controller is typically mounted on a metal plate. The mounted SB25 can be
assembled into enclosures or in another protected area. Allow at least 12 by 7 inches to
mount the SB25, and provide at least 3 inches of clearance above it for the wire
connectors and cable routing.
Since the SB25 Control System is installed at the site of the machine’s final assembly
there are many installation variations. Follow these guidelines when installing or
replacing the Controller:
• Place the SB25 in an enclosure, protected from rain and other fluids. The
SB25 is moisture proof, but it is NOT rated for submerged operation.
• Be sure there are weep holes or one way drains at the bottom of the enclosure.
• Orient the SB25 so that the cover label can be read during troubleshooting and
wiring.
4.2 Wiring
Proper electrical connection to the SB25 is critical to successful operation. The following
sections provide general guidelines for wiring the system. Follow these general
guidelines when wiring to the SB25 Controller:
• Use a minimum of 18 AWG wire, especially on the power and output
connections.
• Install the wiring per SAE Specification J-1121.
• Use 3 amp flyback diodes on all relay coils and non-proportional solenoid
valves to prevent EMI (Electro Magnetic Interference). The use of flyback
diodes on coils and solenoids is necessary even for devices that are not
controlled by the SB25. Unclamped inductive loads will cause spikes to occur
in the system power that can cause the SB25 and other electronics in the
system to malfunction.
• Provide at least 3 inches of clearance above the SB25 for the wire connectors
and cable routing.
• All crimp connections must be made per the crimp contact manufacturers
specifications.
CAUTION - Provide external current paths when welding on the machine. Disconnect
all of the connectors from the SB25 before welding to prevent damage to the SB25 or to
its wiring.
4.2.1 Power Supply
Power supply (+ & -) wiring is critical. The following guidelines must be followed for
successful operation:
• The power supply wires MUST follow as direct a path to the battery as possible.
Do NOT install the SB25 “downstream” of any high current or noisy devices.