Operating Instructions
Start-Up
Before line voltage is applied, double check all items
connected to controller: T
he correct type thermocouple
(see section on thermocouples, p. 11) must be on
terminals 1 and 2 (red on 2) with no AC or DC voltage
leading
or arcing to it. Proper terminals selected for
line voltage (8
&
10 for 240V). No heater shorts or
shorts to ground. No exposed bare wires or frayed
insulation.
On very fast processes heaters should be temporarily
disconnected to give operators familiarization time
without exceeding safe temperature limits of the
process.
Set point: Apply power. After allowing a few seconds
for initialization, the upper display will indicate
thermocoup
le
temperature at the process, the lower
display
wil
show set point temperature, and the index
indicator illuminates set point (SP). The status (output)
indicator will pulse with a greater “on” time as the
difference between actual process temperature and set
point widens, and at lesser “on” time as the difference
narrows.
To establish a setpoint, first make sure the index
memory, depress the “enter” key E. Display will blink.
Alarms: Depress index key
(I)
until index indicator
lights at (Al). Now set alarm one trip point by up or
down keys as before. Enter (E). If configured as
deviation tracking alarm, the lower display shows
difference between set point and the point where alarm
is triggered. (See p. 10 to select alarm functions).
Depress index key
(I)
again and advance to alarm 2
(A2). Set as above.
Rate: Advance index to rate (RT). This is the rate
(differential or anticipating) action adjustment,
calibrated in seconds. It is software connected to
automatic reset (integral or droop correcting) action,
which automatically tracks rate.
This wide range, high resolution, single button entry
T
greatly
simplifies tuning the control to the process.
emporarily
run it down to zero (proportional only) and
enter (E).
Heat
Gain:
Heat gain
(HG),
the next index position,
sets controller gain for heat control. It is the inverse of
proportional band (P.B.) which can be calculated as
ºP. B. = Full Scale º/Gain. At HG = 0, heat is off.
Temporarily set HG
=
400 or about
3.5º
prop. band on
“J”
couple units,
5º
on
“K”.
Proceed to set the next
parameter.
Heat cycling (HC) is next. It should be set to the
longest possible cycling time in seconds (depending on
the mass of process) for increased life expectancy of
relays. 15 to 30 seconds for massive loads, 10 to 15 for
fast loads when relay driven. "T” output solid state
13
light is still on (SP). Then depress the UP button to
increase the value shown in the lower display, or the
DOWN button to decrease it, until the desired setpoint
is reached. To retain this parameter in the non-volatile
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