098-00564-000 Revision A3 – July, 2013 TimeProvider 2300/2700 User’s Guide 49
Chapter 2 Installing
Making Ground and Power Connections
Testing DC Power Connections
To verify that the power connections to the TimeProvider 2300/2700 are correct,
follow the steps in this section. The primary DC power connections on the TP
2300/2700 are referred to as Power A and Return A. The secondary DC power
connections are referred to as Power B and Return B. Use a digital multimeter
(Fluke 77 or equivalent) to make the measurements.
1. Remove all fuses that supply power to the unit from the fuse panel.
2. Remove the power connector cover and disconnect the -48V battery leads from
the unit’s power connector terminals. See the primary and secondary power
connections in Figure 2-11. Leave the Return battery leads connected to the unit.
Figure 2-11. Power and Ground Connections on DC Version of TimeProvider 2300/2700
3. At the chassis end of the battery leads, use the multimeter to measure the
voltage between the following test points:
Test Point Test Point Result
Battery A lead Battery B lead 0 V
Battery A lead Primary: Return A 0 V
Battery A lead Earth Ground 0 V
Battery B lead Secondary: Return B 0 V
Battery B lead Earth Ground 0 V
4. Reconnect the
–48V battery A and battery B leads to the –48V A and –48V B
terminal connectors.
5. Install the A fuse in the power source fuse panel.
6. Measure the voltage between the
–48V A and Return terminals on the primary
power module. The multimeter should indicate –38.4 VDC to –72 VDC.
7. Install the B fuse in the power source fuse panel.
8. Measure the voltage between the
–48V B and Return terminals on the secondary
power module. The multimeter should indicate –38.4 VDC to –72 VDC.
9. Reconnect the DC power connector cover.
The unit is now powered up.
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