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ALARM/TIMER INDICATORS
OPERATOR LOOP

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 The  DOWN  arrow  key,  when  pressed,  will  DECREASE  the  numeric  value  of  the displayed  parameter,  Holding  the  key  in  will  increase  the  rate  of  change  of  the parameter.  Also use this key to answer NO to a NO displayed question. TUNE The RETURN key returns the controller to the OPERATOR mode from any other RETURN mode.  The TUNE key is used for security code entry. The AUTO/MANUAL key (Models 2002 and 2004 only) transfers control of the AUTO outputs to and from automatic control.  The MAN indicator is ON when the MANUAL controller is in the manual mode.  See detailed description in Section 3.3. START The START/STOP key (Models 2000, 2001 and 2003 only) turns the control STOP action ON or OFF.  This key is not a power switch.  The MAN indicator will flash when the output(s) are turned off.  See detailed description in Section 3.2. LAST The LAST key allows you to recall the previous display while in any mode. 2.7 ALARM/TIMER SELECTION The Alarm/Timer relay circuitry has been designed such that the relay coil is energized during normal operation.  This design reverses the normally open/normally closed contact  nomenclature  that  is  common  in  relay  terminology.    The advantage  of  this  design  is  that  in  the  event  of  power  failure,  the  alarm  relay(s)  can  provide  an  alarm  indication. Terminal designations are given for the de-energized condition. PROCESS alarm is an absolute  value  alarm  that  is  independent  of  the  setpoint  and  does  not  shift  when  setpoint  is changed.  It can be either HI or LO acting. DEVIATION alarm is slaved to the controlling setpoint, and can be set as a plus or minus value above, equal to, or below  the  setpoint.    A  Deviation  alarm  shifts  when  the  setpoint  is  changed.    It  can  be  HI  or  LO  acting.    Units  are differential degrees shown on the display as DF or DC for temperature. HI ACTING alarm activates when the measurement is equal to or above the alarm setpoint. LO ACTING alarm activates when the measurement is equal to or below the alarm setpoint. ON TIMER relay (Models 2000, 2001 and 2003 only) is OFF during the timing period and goes ON at the completion of the period.  The ALM lamp will light at the end of the period. OFF TIMER relay (Models 2000, 2001 and 2003 only) is ON during the timing period and goes OFF at the completion of the period, The ALM lamp will be ON during the period and goes OFF at the end of the period. ECLIPSE INSTRUMENTATION DIVISION page 3-1090







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