iL Series User Manual
78
Rev B
California Instruments
C1, a phase loss detection circuit and the undervoltage/overvoltage detection
circuits.
When ON/OFF switch, S1, is closed, a single phase is used to power three bias
transformers on the A14 Bias board. The A14 bias board pr16 VDC, +15
VDC, -5 VDC, +12 VDC for protection circuits, and +24 VDC to current limit relays
K1 and K2.
There are three fuses on the A9 board. The three fuses, A9F2, A9F3, and A9F4 are
in series with the current limit resistors and relays. If all three fuses are open, the
unit will not function. If one or two fuses are open, the phase loss status bit is true
and full power will not be available.
8.3.9 A10 Auxiliary Power Supply Assembly
The 300 VDC is used by the A10 board to generate the bias voltages. The 300 VDC
input line is fused by a one ampere subminiature fuse, A10F1. The A10 supplies an
is5 VDC for the A7 GPIB/RS-232 interface board, A15 BNC board, and A11
front panel board.
The +15 VSW goes to the A4 mother board via J2; the +/-15 V and +5 VSEC go to
the A6 servo board via J4; and +5 VSEC goes to the A8 DSP board via J5. The A10
supply also supplies the 12 VDC to 24 VDC for the fan-speed control. All secondary
bias windings are fused with subminiature fuses, A10F2 through A10F7.
8.3.10 A11 Display Assembly
The A11 assembly contains the display assembly, keypad, rotary pulse generators
(RPG) and digital logic circuits, CPU, and ROM.
8.3.11 A14 Bias Power Supply Assembly
This assembly is used with the 400 volt input option only. The A14 board provides
the DC voltages required for the low voltage regulators and the +24 VDC for the
current limit relays on the A9 board. It also provides the +/-15 VSW to the A10
auxiliary board. An LED lights on the A14 board if fuse F1 opens. Fuse F2 and F3
are for the +24 VDC and +16 VDC. F4 and F5 are for the +/- 15 VSW. F6 and F7
are for the +15 VDC/-5 VDC regulators.
8.3.12 A15 BNC Assembly
The A15 BNC assembly contains the optical isolation circuits that interface the output
common referred A8 DSP assembly to the chassis ground referred A7 isolation
assembly, the A11 display assembly and the Trigger In/Out and RI/DFI circuits also
on the BNC board.
Summary of Contents for 3000iL
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