TM 5-3895-374-24-2
955-257
f)
Press PARAM DISPLAY key and sequentially enter the following values:
PR BAND 1 ---------------------5%: (PB)
RESET 1 ------------------------0 R/M (Turns off Reset Function)
RATE 1 --------------------------0 MIN (Turns off Rate Function)
Also set all Secondary tuning values to 0.
NOTE:
The procedure used in this section is for a "HEATING" output. A similar procedure
may be used for a "COOLING" output.
TUNING THE OUTPUTS FOR HEATING CONTROL
The tuning procedure is easier to follow if you use a recorder to monitor the process temperature.
1)
Press the RETURN key (see THE POINTERS Section 4.6) so that the measurement appears on the screen. It is not
necessary to return to OPERATOR mode while tuning the controller.
Press Start key (Models 2000, 2001 and 2003) or AUTO key (Models 2002 and 2004) to enable the OUTPUTS(s) and
start the process. The "MAN" indicator must be OFF.
2)
The process should be run at a setpoint that will allow the temperature to stabilize with heat input required.
3)
With RATE and RESET turned OFF, the temperature will stabilize with a steady deviation, or droop, between the
setpoint and the actual temperature. Carefully note whether or not there are regular cycles or oscillations in this
temperature by observing the measurement on the display. (An oscillation may be as long as 30 minutes).
4)
If there are no regular oscillations in the temperature, divide the PB by 2.
Allow the process to stabilize and check for
temperature oscillations. If there are still no oscillations, divide the PB by 2 again. Repeat until cycles or oscillations
are obtained. Proceed to step 5. If oscillations are observed immediately, multiply the PB by 2. Observe the resulting
temperature for several minutes. If the oscillations continue, keep doubling the PB until the oscillations stop.
ECLIPSE INSTRUMENTATION DIVISION
page 3-1099
