GE Industrial Solutions ASTAT-CD Plus Solid-State Starters - Manual (Page 21)

ASTAT-CD Plus Service Instructions
21
Step 18. Label the 6 push-on wire connectors with the
numbers printed on the P.C. Board (U1, V1,
W1, U2, V2, W2). Remove 6 push-on wire
connectors from the Protection Board
(Figure 9). Note the location of these
terminals for reassembly.
Step 19. Label the 4 leads from the two current
transformers and the 2 leads from the
thermostats to assure connections are the
same to the 6-point Terminal Board on the
new Protection Board. Disconnect the 4 leads
from the two current transformers and the 2
leads from the thermostats to the 6-point
Terminal Board (Figure 8).
Step 20. Loosen the mounting screws holding the
Protection Board to the housing. Remove the
Protection Board from the ASTAT-CD Plus.
Reassembly
Step 21. Reassemble the new Protection Board, the
push-on wire connectors, the CT leads,
thermostat leads, screws, gate wires and
ground wire (if used), Logic and Power
Supply Board assembly, screws and ribbon
connectors in the reverse order of the above
listed disassembly (Steps 16-20).
Step 22. Reassemble the plastic cover, connectors and
sheet metal cover using steps 8-10.
To replace SCRs
NOTE: POWER MUST BE REMOVED
BEFORE SERVICING.
Step 23. Remove the front cover by removing the (4)
Phillips head screws (Figure 1).
Step 24. Phase 1 or 3 - Remove bus bars, the fan
assembly, the top ventilating cover and the
heat sink insulator cover. Remove the
thermostat wires, gate and cathode leads from
the SCRs, current transformer leads from the
C. T. (only on Phase 1) and other parts that
interfere with removal of the SCR/heatsink
assembly (Figure 10).
Phase 2 - Remove bus bars, the fan assembly,
the top ventilating cover and the heat sink
insulator covers from both phase 1 and Phase
3 heatsink assemblies. Remove (4) Allen
screws in the black plastic bottom housing
that holds the Control assembly to the
heatsink assembly and move the assembly to
the side. Remove the thermostat wires, gate
and cathode leads from the SCRs, current
transformer leads from the C. T.’s, and other
parts that interfere with removal of the
SCR/heatsink assembly (Figure 10).
Terminal Blower Circuit board Heatsink
Board transformers assembly insulating cover
Phase 1 Phase 2 Phase 3
Current MOV Bus bar support Bus bar
transformers bracket and
fan assembly
Figure 10. Parts locations insulating covers
Step 25. Remove the bolts on the ends of the heatsink
assembly that hold the H. S. assembly to the
housing insulators. Then slide the H. S.
assembly out the bottom of that ASTAT
housing. (Figure 11). Retain all parts and
hardware for reassembly.