68 Rockwell Automation Publication 20Y-TG001C-EN-P - April 2017
Chapter 6 Precharge Component Section
3. Use a digital voltmeter to test the control transformer (T4).
a. Measure the primary AC line voltage, which is at the 400…480V AC
or 600…690V AC system voltage.
b. Measure the control transformer (T4) output voltage, which is
approximately 120V AC.
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 step a
and step b.
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 120V 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 step a
and step b.
The 24V DC power supply (T10) can require replacement if these
measurements continue to be outside of the ±10% tolerance.
For AFE in IP21 Rittal Enclosure
To test the control transformer and power supply in an IP21 Rittal enclosure,
follow these steps.
1. If present, remove the protective barriers.
See Remove AFE Protective Barriers
on page 44.
2. Locate the control transformer (T4) and 24V DC power supply (T10).
The control transformer (T4) is located behind the Control Frame. The
24V DC power supply (T10) is on a subpanel in front of the
components that are shown in the front view.
ATTENTION: Perform these tests only with qualified personnel.
During these tests, the AFE is powered. Take proper precautions to
avoid injury from electrical shock.
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