Amada Miyachi Unitek STA-100A, Operation Manual, Page: 103 / 154

STA SERIES AC CONTROLS
990-351 E-1
APPENDIX E
CASCADE BOARD OPTION
Description
The Cascade Board gives the Control the ability
to operate up to four SCRs instead of just one.
The STA-600 and STA-800 use two Cascade
Boards in order to operate up to six and eight
SCRs respectively.
Cascade Board
Maintenance/Replacement
1 Disconnect the 26-pin ribbon cable connector from the AC Timer Main Board connected to J2.
2 Disconnect the 8-wire cable connector from each of the SCR Driver Boards connected to J4
(SCR1) through J7 (SCR4) as required.
3 Disconnect the 2-wire power connector from J8.
4 Slide the card out of the card cage.
5 Install or re-install the circuit board by
sliding it into the card cage.
6 Reconnect the 26-pin ribbon cable
connector from the AC Timer Main
Board to J2
7 Reconnect the 8-wire cable connectors
from each of the SCR Driver Boards to
J4 through J7 as required.
8 Reconnect the 2-wire power connector
to J8.
9 Slide the board into the card cage.
Cascade Board Connector Locations
J2
J8
J3
J4 J5 J6 J7
SCR4 SCR 3 SCR2 SCR1