Rockwell Automation Publication 20Y-TG001C-EN-P - April 2017
69
Precharge Component Section
Chapter 6
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 230V 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
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.
24V DC Power Supply (T10)
(behind control frame panel)
Control transformer (T4) is
mounted directly behind
motor-controlled circuit
breaker (MCCB).
Front View
(shown with enclosure doors removed)
