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
The RETURN key returns the controller to the OPERATOR mode from any other
mode. The TUNE key is used for security code entry.
The AUTO/MANUAL key (Models 2002 and 2004 only) transfers control of the
outputs to and from automatic control. The MAN indicator is ON when the
controller is in the manual mode. See detailed description in Section 3.3.
The START/STOP key (Models 2000, 2001 and 2003 only) turns the control
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.
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.
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