Step 2. Checking the Power Supply Voltages

Check power supplies and connections and check power supply voltages. Verify that the voltages are in the proper range at all associated screw terminal connections.

For 12 VDC systems verify that:

• The voltage at the System Power Supply (Dual DC/DC) is 12.1-12.3 volts.
• The voltage at the last carrier is greater than 11 volts.
• Bussed field power is 24 VDC or 115/230 VAC as applicable.

For 12 VDC systems with redundant System Power Supplies, remove one power supply before verifying the voltage.

For 24 VDC systems verify that:

• The voltage at the System Power Supply (Dual DC/DC) is 24.2-24.6 volts.
• The voltage at the last carrier is greater than 11 volts.
• Bussed field power is 24 VDC or 115/230 VAC as applicable.

For 24 VDC systems with redundant System Power Supplies, remove one power supply before verifying the voltage.

Check output loading and verify that the voltages (where present) are in the proper range at all associated screw terminal connections. Also, verify that the expected load is within the capacity of the unit.