General Maintenance and Troubleshooting
SM 6495, Rev. 7, December 2008 2-7
7. With the crossing operating and the gate arm going up, make certain that the voltage does not fall
below 11VDC on 12-volt systems and 21 VDC on 24-volt systems.
8. Place the voltmeter on the AC scale. The voltmeter must block the DC voltage. For some
voltmeters, such as most analogs, it may be necessary to place a 0.1μF to 1μF capacitor in series
with the meter. An oscilloscope can be used as an alternative.
9. Again, with the crossing operating and the gate arm going up, check that the voltmeter does not
read more than 3 VAC (this is checking the AC).
2.3.2. Wiring Diagram for 12-Volt Systems
Connect the wires to the Terminal Board as shown in Figure 2-2 or Figure 2-3 for 12-volt systems.
NOTE
The wiring diagrams in Figure 2-2 and Figure 2-3, have the spare,
unused terminals on the lower terminal block. Gate mechanisms
produced prior to July 5, 2004, have wiring arrangements that had the
spare/unused terminals on the upper block.
2.3.3. Wiring Diagram for 24-Volt Systems
Connect the wires to the Terminal Board as shown in Figure 2-4 for 24-volt systems.
NOTE
The wiring diagram in Figure 2-4 has the spare, unused terminals on the
lower terminal block. Gate mechanisms produced prior to July 5, 2004,
have wiring arrangements that had the spare/unused terminals on the
upper block.
2.3.4. Wiring Diagram for 3-Wire Control 12-Volt Systems
Connect the wires to the Terminal Board as shown in
Figure 2-5 for 3-wire control 12-volt systems
NOTE
The wiring diagram in
Figure 2-5 has the spare, unused terminals on the
lower terminal block. Gate mechanisms produced prior to July 5, 2004,
have wiring arrangements that had the spare/unused terminals on the
upper block.
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