The Alarm Limits & Shutdown interval display

TM-5-3895-374-10 Paving Machine Bituminous Material: Crawler Mounted Diesel Engine Driven Manual
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TM 5-3895-374-10 options . . utilities . . calibration ........................................................................................................... ALARM LIMITS display <8> <6> <2> The Alarm Limits & Shutdown interval display is shown in Figure 862.0Note that even though this display overwrites the entire Main Operating Display, the plant operation and data gathering continues uninterrupted. This display shows the current process deviations that are allowed before alarms are annunciated. Also shown are the time intervals during which a continuous alarm must persist before automatically causing the process to be halted. If any time interval is set to 0 seconds, that particular alarm is disabled, will never annunciate, and can never shut down the process. The maximum shutdown interval is 255 seconds. The alarm limit for either the virgin or recycle scale is shown in per cent of total aggregate request. Deviations of plus or minus the limit shown are allowed. For example, at a target aggregate rate of 200 dTPH and 20% recycle, a 5% recycle scale error would be annunciated if the actual recycle rate was 30 TPH (15% of 200 TPH) or 50 TPH (25% of 200 TPH). The alarm limit for A/C Blend is the difference between the target A/C value in percent and the actual measured A/C value in per cent. Again, the allowable deviation is plus or minus the percentage shown. For example, at 200 TPH of virgin aggregate a target of 5%mA/C requires 10.5 TPH of A/C. At 9.9 TPH the added A/C is 4.7x and the deviation is - 0.3%mA/C. At 11.2 TPH, the added A/C is 5.3x and the deviation is +0.3%mA/C. The Divert Error does not need a limit value. It is the time during which the RUN-DIVERT valve is not in the expected position. The Feeder Error also does not need a limit value. It is the time during which the low aggregate alarm switch or some other means indicates that inaccurate delivery of aggregate is probably occurring. The Continuations Options are: OPTION KEY DESCRIPTION ESCape ESC Return to the previous display. Edit .00 Gain access to the data shown so that one or more of the parameters can be changed. Access cannot be obtained if the DATA KEY is in the DATA LOCKED position. Print 9 Print this screen display. The printer must be turned ON and SELECTed. page F - 56 SYSTEMS Equipment Corp. 8/31/89 Page (30)

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