Instruction manual

3534
Special Functions
In manual control
mode, error conditions
such as A/D errors
and open or reversed
sensors will be
ignored.
Auto/Manual Operation (Standard)
To put the controller in manual mode, set the damping [dPnG]
parameter in menu level “02” to [ OFF ]. Press and hold the
Mode key for four seconds until the lower display win-
dow flashes [ StbY ]. Hold down the Mode key for another
four seconds to initiate manual operation. The lower display
window will flash PID output as a percentage of output power,
from 100 to -100, alternating with the output controlled (tem-
perature controllers will flash [ HEAt ] or [ CooL], process
controllers will flash [ OUt1 ] or [OUt2 ].) To take the con-
troller out of manual mode, press and hold Mode key to
four seconds.
Remote Setpoint Option
If your controller was ordered with this option, you may
select either of two setpoints for your process. The second
setpoint can be enabled only by an external switch or signal,
according to your ordering specifications. The "F2" LED on the
front panel will illuminate when a second setpoint is selected.
If you do not know how your controller was configured, refer
to the ordering code and description on page 65.
Tu n i n g
P ro c e d u re s
11) Repeat for Cycle Time 2 [ CY.t2 ].
12) Change to menu level “05”.
13) Set Cooling Type [ CoL.t ] to [ nor ].
14) Press the Mode key once. Setpoint Value will be
displayed. The recording device should now be tracking
process temperature.
15) Double the Gain [ Gn.o1 ] until a small, sustained oscilla-
tion is visible on the recording device’s trace.
16) Measure the period of one cycle of oscillation (“T” on the
diagram below).
17) Divide the period of oscillation (T) by eight (8). The result-
ing number is the correct Rate time [ rAtE ] in seconds.
Multiply this number by four. This is the correct Reset time
[ rSEt ] in seconds.
18) Multiply the gain (from step #15) by 0.6 and enter this
number as Gain [ Gn.o1 ].
19) Enable the cooling device. If overcooling exists, decrease
the Gain Ratio [ Gr.o2 ] in steps of 0.1 until temperature
oscillation stops. If cooling is sluggish, increase the Gain
Ratio in steps of 0.1 until optimum results are achieved.
T
Calculate and enter these
numbers:
Rate [ rAtE ] = T/8
Reset [ rSEt ] = T/2.0
Gain [ Gn.01 ] = Gain from
Step (8)
On noisy processes,
where Rate cannot be used:
Gain [ Gn.01 ] = from Step
(8) x 0.45
Reset [ rSEt ] = T/1.2
T