Allen-Bradley 23PFC, Руководство по обслуживанию оборудования

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58 Rockwell Automation Publication 23PFC-TG001A-EN-P - March 2018
Chapter 3 Frame A Field Controller Part Replacement Procedures
AC Current Transducer
Replacement Remove the AC Current Transducers
1. Read the General Safety Precautions on page 10 .
2. Remove power from the device (see page 33 ).
3. Remove the protective covers (see page 36 ).
4. Remove the control EMI shield and control circuit board (see page 48 ).
5. Remove the pulse transformer and switching power supply circuit
boards (see page 50 ).
The device rating determines the power bridge configuration and where
the AC current transducers are in the device. Complete the applicable
procedures for your field controller:
• 17 A and 60 A frame A field controllers have AC current transducers
that are installed on the power traces board. See AC Current
Transducers on Devices with a Power Traces Board.
• 120 A frame A field controllers have AC current transducers that are
installed on the bus bars inside the field controller. See Remove the
AC Current Transducers from 120 A Field Controllers on page
60 .
AC Current Transducers on Devices with a Power Traces Board
The field controller amp rating determines how the AC current transducers are
secured to the power traces board. Complete the applicable procedures for
your field controller:
• See Remove the Current Transducers with Connection Bars on page 59
for devices with one metal bar and no windings on the AC current
transducers.
• See Remove the Current Transducers with No Connection Bars on page
59 for devices no metal bar and windings on the AC current transducers.
IMPORTANT AC current transducers must be replaced in pairs.