iL Series User Manual
California Instruments
Rev B
77
8.3.3 A5 Relay/Filter Assembly
The A5 assembly consists of the output voltage filters, the output voltage range
relays, A5K1, A5K2, and A5K3, the output voltage disconnect relays, A5K5, A5K7,
A5K8, and A5K9, the remote sense relays, A5K4 and A5K6, the paralleling relays,
A5K10 and A5K11, and other associated circuits. It also interconnects the A7
isolation assembly, A11 display assembly, A8 DSP assembly, and A15 BNC
assembly with each other.
8.3.4 A6 Servo (Control) Assembly
The A6 servo or control assembly consists of control circuits for the A1, A2, and A3
power amplifiers where required. It contains the voltage and current control
amplifiers and receives the voltage and current programming information from the
A8 DSP assembly. It interconnects the range and protection signals between the A5
and A8 assemblies.
8.3.5 A7 Isolation Assembly
The A7 isolation assembly contains the CPU and logic circuits for communicating
with either a GPIB or RS232 computer/controller.
8.3.6 A8 Controller (DSP) Assembly
The A8 DSP board contains the CPU, ROM’s, Digital-to-Analog circuits and Analog-
to-Digital circuits to control the output voltage and output current setting. The A8
board also contains all the logic circuits for generating arbitrary waveforms,
frequency changes and phase control. At power-on, the DSP board performs a self
test and reports failure via the front panel display.
8.3.7 A9 Input Power Supply Assembly (208 Volt Input)
The A9 input power supply assembly contains the following circuits: an inrush-
current-limit circuit to initially charge capacitor C1 to 300 VDC, a phase loss
detection circuit, the undervoltage/overvoltage detection circuits, and +/-15VSW to
the A10 auxiliary power supply assembly. When ON/OFF switch, S1, is closed, a
single phase is used to power two bias transformers to generate the +/-15 VDC, 12
VDC for the protection circuits, and 24 VDC to the current limit relays K1, K2, and
K3.
There are four fuses on the A9 board. Fuse A9F1 is in series with the ON/OFF
switch, S1. If fuse A9F1 is open, the AC source will not function at all. The
remaining three fuses, A9F2, A9F3, and A9F4 are in series with the current limit
resistors and relays. If all fuses are open, the unit will not function.
If one or two fuses are open, the phase loss status bit is true and full output power
will not be available.
8.3.8 A9 Input Power Supply Assembly (400 Volt Input)
The A9 input power supply assembly contains a current limit circuit to initially charge
C9 and C10 to 550 VDC, a step-down switching regulator to power the +300 V on
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Страница 84: ...iL Series User Manual 74 Rev B California Instruments Figure 21 Troubleshooting Diagram for No Output Present...
Страница 89: ...iL Series User Manual California Instruments Rev B 79 Figure 23 AC Power Source Block Diagram...
Страница 93: ...iL Series User Manual California Instruments Rev B 83 Figure 25 AC Input Board Parts Location...
Страница 94: ...iL Series User Manual 84 Rev B California Instruments Figure 26 Mother Board Parts Location...