HEAT SOURCE
HEAT TRANSFER
MEDIUM
SENSOR
375
°
F
PART BEING HEATED
OR "WORK" 330
°
F
MOLD
Display Shift
In certain applications it is desirable to shift the con-
trollers indicated value from its actual value. This can be
easily accomplished with this control by using the dis-
play shift function. Cycle the control to the
param-
eter by using the “Scroll” pushbutton. The number you
adjust here, either positive or negative, will be the
amount that the process value (PV) will be shifted from
the actual value. This amount will be the same across
the entire range of the control. Note the example stated
below.
The desired temperature at the part to be heated is 330
degrees F. In order to achieve that temperature, the
controlling value or the temperature at the sensor must
be 375 degrees F. Due to the design and position of the
18
DISPLAY BEFORE
INPUT SHIFT.
(PROCESS VALUE DISPLAYED)
DISPLAY AFTER INPUT SHIFT.
ADJUST SV TO 330.
(PROCESS
VALUE DISPLAYED)
Figure 5.5 Display Shift
components of the system, the sensor could not be
placed any closer to the work.
Thermal gradients (different temperatures) are common
and necessary to an extent in any thermal system for
heat to be transferred from one point to another.
The difference between the two temperatures is 45
degrees F. You should input –45 as to subtract 45
degrees from the actual process value (PV). Cycle the
control back to the process value after making this
adjustment.
The display shift will alter the process value (PV) only.
The set point must be manually adjusted to 330.
DISPLAY AFTER SHIFT AND SV
ADJUSTMENT.
(PROCESS VALUE DISPLAYED)
