6-78 | Model 933S UV Analyzer
Decimal Alarm
Bit Value Type Alarm Condition / Description and Suggested Corrective Action
3 8 Fault f: OBMC-HC communication problem
The Microcontroller board cannot establish reliable communications with the
Host Controller board.
Corrective Action:
Take appropriate safety precautions to safely shut down the analyzer and:
• Take appropriate safety precautions and cycle the analyzer AC power o for a
minimum of 15 seconds before cycling it on again.
If this doesn’t correct the alarm, take appropriate safety precautions and:
• From the Info dialog box and click the HC Reset button to reset the Host
Controller board.
If this still doesn’t correct the alarm, open the Electronics Enclosures, and:
- Reset the Host Controller board (press SW100, Lower Enclosure – see
Figure 6-17).
- Reset the Microcontroller board (press SW400, Upper Enclosure – see
Figure 6-18).
• Check the connections of the cable between the Host Controller (J300) and
Micro-Interface (J104) boards. Also, inspect it for damage (cuts, nicks, burn
marks, etc.).
• Replace the Microcontroller, Host Controller, and/or Micro-Interface boards.
Contact AMETEK to verify operation before removing any of these boards.
4 16 Fault f: Cell temperature out of range
The Measuring Cell temperature has exceeded its Too Hot setpoint, fallen
below its Too Cold setpoint, or the Measuring Cell temperature range is not
set properly. This alarm may occur during a cold start, but will clear after the
temperature zone has stabilized within its normal operating range.
Note: This alarm is used only by analyzers equipped with (and controlling) a
heated Measuring Cell.
Corrective Action:
From the Temperature Control dialog box, check the Cell Too Hot and Too
Cold setpoints. Also, check the Cell temperature Range; it should be set to the
Cell Temp RTD Range indicated on the Analyzer Programming Parameters
sheet included in the analyzer Documentation Package. See “Temperature
Control” in Chapter 4.
Perform the following checks:
• Check the ambient temperature around the analyzer; if it is higher than the
Too Hot setpoint or lower than the Too Cold setpoint, adjust the surrounding
temperature to within the Cell temperature measuring Range.
Take appropriate safety precautions, open the Upper Enclosure, and:
• Check the jumpers at JP300 on the Micro-Interface board for proper
temperature range setting. The typical default jumper setting is Range “A”
(jumpers 1-2). See “Temperature Control” in Chapter 4.
• Check the Measuring Cell RTD (Figure 6-1) for a short or open circuit.
Replace the RTD, if necessary. Contact AMETEK to verify operation before
removing this component.
• Replace the Micro-Interface board. Contact AMETEK to verify operation
before removing this board.
Setup (tab)Temp
Control
Setup (tab)Analyzer
Info
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