Connect-Tek Transa PRO 17 Bedienerhandbuch PDF herunterladen (Seite 38)

3–13 Sensor Break Alarm

Alarm 1 or alarm 2 can be configured as a sensor break alarm by selecting SENB

for A1FN or A2FN. If alarm 2 is required as a sensor break alarm, then

AL2 should be selected for OUT2. The sensor break alarm is activated as soon

as failure mode occurs. Refer to section 3-16 for failure mode conditions. Note

that A-D failure also creates a sensor break alarm. TIME, A1SP, A1DV, and

A1HY are hidden if alarm 1 is configured as a sensor break alarm. Similarly,

TIME, A2SP, A2DV and A2HY are hidden if alarm 2 is configured as a sensor

break alarm. One of four kinds of alarm modes can be selected for sensor break

alarm. These are: normal alarm, latching alarm, holding alarm and

latching/holding alarm. However, the holding alarm and latching/holding alarm

are not recommended for sensor break alarm since sensor break alarm will not

perform the holding function even if it is set for holding or latching/holding

mode. See section 3-8 for the descriptions of these alarm modes.

3–14 SP1 Range

SP1L (SP1 low limit value) and SP1H (SP1 high limit value) in the setup

menu are used to confine the adjustment range of SP1.

Example: A freezer is working in its normal temperature range -10°C to -15°C. In order

to avoid an abnormal set point, SP1L and SP1H are set with the following values:

SP1L=-15°C SP1H=-10°C

Now SP1 can only be adjusted within the range of -10°C to -15°C.

3–15 PV1 Shift

In certain applications it is desirable to shift the controller display value from its actual value. This can easily be accomplished by

using the PV1 shift function.

Press the “scroll” key to bring up the parameter SHIF. The value you adjust here, either positive or negative, will be added to the actu-

al value. The SHIF function will alter PV1 only.

Here is an example. A process is equipped with a heater, a sensor, and a subject to be warmed up. Due to the design and position of

the components in the system, the sensor could not be placed any closer to the part. Thermal gradient (different temperature) is com-

mon and necessary to an extent in any thermal system for heat to be transferred from one point to another. If the difference between

the sensor and the subject is 35°C, and the desired temperature at the subject to be heated is 200°C, the controlling value or the tem-

perature at the sensor should be 235°C. You should input -35°C so as to subtract 35°C from the actual process display. This in turn

will cause the controller to energize the load and bring the process display up to the set point value.

Sensor Break Alarm 1

Setup: A1FN=SENB

A1MD=NORM, LTCH

Hidden: TIME, A1SP, A1DV, A1HY

Sensor Break Alarm 2

Setup: OUT2=AL2

A2FN=SENB

A2MD=NORM, LTCH

Hidden: TIME, A2SP, A2DV, A2HY

Setup: SP1L, SP1H

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Connect-Tek Transa PRO 17 Bedienerhandbuch Seite 38