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Rockwell Automation Publication 20Y-TG002C-EN-P - April 2017
Chapter 6
Precharge Component Section
If these measurements are not within ±10%, perform these steps.
c. Power down the AFE.
d. Remove the output (secondary) wires.
e. Power up the AFE and retest by repeating
and
The control transformer (T4) can require replacement if these
measurements continue to be outside of the ±10% tolerance.
4. Use a digital voltmeter to test the 24V DC power supply (T10).
a. Measure the primary voltage, which is 230V AC.
b. Measure the power supply (T10) output voltage, which is
approximately 24V DC.
If these measurements are not within ±10%, perform these steps.
c. Power down the AFE.
d. Remove the 24V DC output wires of the power supply (T10).
e. Power up the AFE and retest by repeating
and
The 24V DC power supply (T10) can require replacement if these
measurements continue to be outside of the ±10% tolerance.
Test the Precharge Bridge
Using the Power Structure
Terminals
1. Remove power from the AFE.
Remove Power from the AFE on page 37
.
2. If present, remove the protective barriers.
Remove AFE Protective Barriers on page 44
.
3. To test the precharge bridge, measure the points on the power structure
that is listed in
.
Table 6 - Precharge Bridge Tests on Power Structure
Meter Leads
Nominal Meter Reading
Test Point Locations
+
-
DC-
L1
Value gradually rises to about 0.48V
(1)
(1) The actual voltage reading can vary depending upon your equipment. If your readings are not near 0.48V, verify that the actual
voltage that is measured is consistent for the power structure.
DC-
L2
DC-
L3
L1
DC+
L2
DC+
L3
DC+
L1
DC-
Meter displays charging voltage.
L2
DC-
L3
DC-
DC+
L1
DC+
L2
DC+
L3
LI
+
-
L2
L3