990 CLD Autoline™ Leak Detector
DR
AFT 2/2/04
2-3
Electrical Connections
For this procedure, refer to Figure 1-1 on page 1-1, Figure 1-3 on page 1-6 through
Figure 1-5 on page 1-10. Electrical connections include spectrometer tube, high vacuum
pump, spectrometer tube integral ground, and ancillary connections.
To complete electrical connections:
1. Ensure that the MAIN POWER switch on the leak detector is in the off position.
2. Refer to “Wire Run Lists” on page 2-4 and terminate the high vacuum pump and
spectrometer tube cables at the console using pluggable terminal blocks, with the
exception of the cold cathode gauge cable and main power cable. This enables these
cables to be cut to length to fit the application. Care must be taken to make the correct
connections to the pluggable terminal blocks, if the cable length is adjusted. The cold
cathode gauge connector (a high voltage SHV-type) must be cut and replaced if it is
necessary to adjust its length. Ion source and preamplifier connections on the
spectrometer tube are keyed to prevent accidental interchanging. Custom spectrometer
tube cable lengths (20’ maximum) are available upon request.
3. Connect the power cable to the appropriate power source.
4. Refer to “Wire Run Lists” on page 2-4 and perfom auxiliary connections as required for
the application:
❑
Four, 6 A, 250 VAC, form C, dry contacts are provided on a pluggable terminal block
(labeled SET POINTS) on the rear panel of the console. These contacts either
make
or
break
an externally-connected circuit once the leak rate equals or surpasses the
pre-programmed set points.
❑
A pluggable terminal block provides the main control and I/O functions of the
controller.
❑
Five pairs of isolated connections are provided, one to turn on the filament in the ion
source, one to turn it off, and three to control the display range. The level of voltage
required to operate these functions is selected via the installation of five
OPTO-22
modules accessible at the rear panel of the console. Voltage ranges of 2.5 to 28 VDC,
35 to 60 VDC, or 120 VAC/DC are available.
❑
A pair of connections provides an analog voltage output proportional to the leak rate
as read by the spectrometer tube. The output is configured by four Internal jumpers.
The output can be selected to be linear or logarithmic (Appendix A “Understanding
the 990 CLD Analog Leak Rate Output” on page A-1). Changing the jumpers
requires re-calibrating the output. Refer to 4“Maintenance” on page 4-1 for details.
The factory default setting is linear output.
❑
A pair of connections provides an analog voltage output proportional to the
spectrometer tube pressure as read by the cold cathode gauge in the spectrometer
tube. The output voltage ranges from 0 to 10 V indicating a minimum to maximum
meter scale. The high pressure trip point for filament protection is approximately 4 V.
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