OEM Controls SB25 - Manual (Page 11)

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• Verify that the ground wiring is correct.
• Are there any machine interlocks (or “enable” signals) that are preventing
operation?
5.1 Use of diagnostic LEDs
5.1.1 I/O diagnostic LEDs
Each I/O channel has an associated diagnostic LED. The cover label indicates the I/O
channel that each LED is associated with. The number above each LED indicates the pin
number on the BT connector that the LED is associated with. Conversion from the
customer defined name to the pin number on the BT connector is accomplished by
referring to the cover label. The connector definitions on the cover label have the
connector pin # in the left column, the customer defined name in the center column and
the OEM Controls, Inc. name for the I/O channel in the right column.
The LED for each I/O channel is ON if the associated I/O channel is ON and OFF if the
associated I/O channel is OFF. This is a very simple and powerful diagnostic tool. If an
output is not ON when you expect it to be ON, first check the LED associated with that
output. Than verify that the input(s) that control the non-functioning output is present at
the expected SB25 input. Most problems can be traced back to faulty input sensors, poor
connections and incorrect wiring rather than the SB25 Controller.
5.2 Optimizer diagnostics
Diagnostic and system information is available with the Optimizer Menu key. Connect
an Optimizer to the SB25. Press the Menu key to enter the Diagnostic Menu. The Enter
key is used to step through all menu items.
Status for I/O channels provides useful troubleshooting information. The identifier for
each I/O channel uses OEM Controls, Inc. name rather than the customer defined name.
Conversion from the customer defined name to the OEM Controls, Inc. name is done by
referring to the cover label. The connector definitions on the cover label have the
connector pin # in the left column, the customer defined name in the center column and
the OEM Controls, Inc. name for the I/O channel in the right column.
The number below the OEM Controls, Inc. name for I/O channel indicates the status of
that I/O. A “1” indicates that the I/O channel is ON and a “0” indicates that it’s OFF.
For Digisensor inputs, the number varies from 0 through 510. For bi-directional outputs,
0 indicates full ON in one direction and 510 is full ON in the other direction. A
Digisensor count of 255 is centered (or OFF). If the Digisensor is either not connected,
centered, or malfunctioning, a count of 255 should be displayed under the OEM Controls,
Inc. name for that Digisensor.
5.3 Digisensor diagnostic LEDs
There are two LEDS on each Digisensor. To check for proper operation, apply power to
the Digisensor and observe the LEDS.