Allen-Bradley 23PFC, Руководство по обслуживанию оборудования, Страница: 20 / 150

20 Rockwell Automation Publication 23PFC-TG001A-EN-P - March 2018
Chapter 2 Component Test Procedures
Troubleshoot an AC
Undervoltage Fault Measure the AC line input signals, as directed in these steps, when one of these
conditions exists:
• The device faults with an AC Undervoltage Fault (F4)
• Parameter 466 [AC Line Voltage] does not equal the expected incoming
AC line voltage
1. Read the General Safety Precautions on page 10 .
2. Remove the protective covers from the device.
• For frame A devices, see page 36
• For frame B devices, see page 80
3. Use a voltmeter to measure the voltage at terminals U, V, and W of the
device. If an AC input contactor is used, the voltage must be measured
on both the input and output sides of the contactor.
4. If any of the voltage measurements is incorrect or missing, remove
incoming AC power and verify the wiring to the device and the power
supply source and correct any problems.
5. Using a voltmeter, measure the combined voltages of the AC lines on the
following testpoints on the control board (all waveforms have a 2.5V
offset).
• See
Figure 1 on page 18 and Figure 2 on page 19 for location of the
testpoints.
• See Figure 19 on page 129 for a schematic diagram.
ATTENTION: Servicing energized equipment can be hazardous. Severe
injury or death can result from electrical shock, burn, or unintended
actuation of controlled equipment. Follow Safety related practices of NFPA
70E, ELECTRICAL SAFETY FOR EMPLOYEE WORKPLACES.
Table 2 - Combined AC Line Input Signal Testpoints
Incoming AC
Line Voltage Phases Measure from
Testpoint … To Testpoint Peak to Peak
Measurement RMS
Measurement
115V AC V and U XY22 … XY18 1.93V AC 0.683V
V and W XY21 … XY18
480V AC V and U XY22 … XY18 2.95V AC 1.040V
V and W XY21 … XY18