9

96VTR

Ver. 2.0 11/99

HiLt: High limit (of Span or Range). Set High Limit higher than the highest expected SV

and PV display. Note that the high limit setting is limited by the range of the type

of input used (refer to Section 2.2 for ranges).

9. PARAMETERS IN THE FOURTH PROGRAMMING LEVEL

Press and hold the SCROLL and RETURN keys simultaneously for 5 seconds to enter

this level from the previous programming level. To return to normal operation at any

time, press the RETURN key.

LoCA and HiCA: Low and High Input Calibration values used for engineering units

scaling. Refer to Section 9.1 below for details.

tunE: Auto-tuning ‘automatic initialization mode’ selection. Select the criteria by which

the controller initiates an automatic Auto Tune session. Set this parameter as

desired from the Table in Section 9.2. To activate Auto Tune manually, refer

to Section 9.2.

9.1. CALIBRATION

Important Note: Special equipment is required to perform calibrations. Do not initiate

the calibration process unless fully prepared to do so.

a.

"LoCA" (Low Calibration) is the first parameter to appear in this level.

b.

For temperature inputs, connect a Thermocouple (mV) or RTD (resistance)

simulator to the controller's input terminals. For a process DC input, use a 4-20mA

or 1-5VDC signal, depending on the input type of the controller.

c.

Apply the low input signal to the controller which corresponds to the range you are

using, i.e., for 4-20 mA inputs, 4 mA would now be applied to the controller.

d.

Use the UP/DOWN arrow keys to set the value which will display when a 4mA

signal is applied to the controller. For example, for a 4-20mA unit to display from –

50 to +150, set ‘LoCA” to –50.

e.

Press and hold the RETURN key for at least 5 seconds and the parameter on the

display will change from "LoCA" to "HiCA" (High Calibration). The Low Calibration

value is now written into the controller's non-volatile memory.

f.

Apply the high input signal to the controller which corresponds to the range you are

using. For example, for a 4-20mA input controller, apply a 20mA signal.

g.

Use the UP/DOWN arrow keys to set the value which will display when a 20mA

signal is applied to the controller. For example, for a 4-20mA unit to display from –

50 to +150, set ‘LoCA” to +150.

h.

Press and hold the RETURN key for at least 5 seconds. The display will change

from "LoCA" to "SP". The High Calibration value is now written into the controller's

non-volatile memory.

i.

Input a signal midway between the Low and High Calibration signals previously

applied (12mA in the example for a 4-20mA input) and verify that the display shows

a value midway between the high display and the low display. For the example

above, for a -50 to +150 display range, a 12mA input will display +50. If not, try the

calibration procedure again.

j.

Press the RETURN key when complete to return to normal operation.

9.2 AUTO TUNING

9.2.1 Auto Tune Initialization Modes

The Controller has the capability to start an Auto Tune session automatically. If this is

desired, select the conditions whereby an Auto Tune session will automatically begin

from Table III below. The controller defaults to Setting = ‘0’ (user initiates an Auto Tune

session). To manually initiate an Auto Tune session follow the procedure in Section

9.2.2.