Allen-Bradley 23PFC, Руководство по обслуживанию оборудования

Страница: 103 / 150

Rockwell Automation Publication 23PFC-TG001A-EN-P - March 2018 103
Frame B Field Controller Part Replacement Procedures Chapter 4
Install the AC Line Snubber Circuit Board and Resistors
Install the AC line snubber board and resistors in reverse order of removal.
SCR Modules Replacement Remove the SCR Modules
1. Read the General Safety Precautions on page 10 .
2. Remove power from the device (see page 79 ).
3. Remove the screws and washers that secure the plastic shields to the
bottom of the device and remove the shields.
4. Remove the bolts, washers and wiring from the power terminals (U, V,
W, C, and D).
5. Remove the protective covers from the device (see page 80 ).
6. Remove the pulse transformer and switching power supply boards from
the device (see page 93 ). You do not need to remove the switching power
supply board from the back of the pulse transformer board for this
procedure.
IMPORTANT Thermal grease must be applied to the bottom of the resistors before
securing them to the heat sink.
3
3
U Phase V Phase
Bottom View
W Phase
D C
4
IMPORTANT Mark all connections and wires before removal to avoid incorrect
wiring during reassembly.