Connect-Tek Transa PRO 17 Manual de Instruções descarregar pdf (Página 44)

3–23 Display Mode

Operation

Press several times until (display)

appears on the display. Then press to enter display mode.

You can select more parameters to view by pressing or press-

ing in reverse sequence. The system mode of the con-

troller and its operation will remain unchanged. When the con-

troller enters display mode, the upper display will show the

parameter value and the lower display will show the parameter

symbol except and

shows the percent-

age value for output 1 and shows the percentage value

for output 2 on the lower display while the upper display shows

the current process value.

PVHI/PVLO show the historical extreme

(maximum or minimum) values of the

process on the upper display. The historical

extreme values are saved in a nonvolatile

memory even when it is unpowered. Press

for at least 6 seconds to reset both the

historical values PVHI and PVLO and begin

to record new peak process values.

MV1/MV2 show the process value on the

upper display and shows the per-

centage control value for output 1, while

shows the percentage control value

for output 2.

DV shows the difference value between

process and set point (i.e., PV-SV). This

value is used to control output 1 and output

PV1 shows the process value of input 1 on

the upper display.

PV2 shows the process value of input 2 on

the upper display.

PB shows the current proportional band

value used for control.

TI shows the current integral time used for

control.

TD shows the current derivative time used

for control. Since the controller is perform-

ing FUZZY control, the values of PB, TI,

and TD may change from time to time.

CJCT shows the temperature at the cold

junction, measured in °C independent of the

unit used.

PVR Shows the changing rate of the process

in °C (or °F or PU) per minute. It may be

negative if the process is going down.

PVRH/PVRL The maximum and mini-

mum changing rate of the process since

power up, as measured in °C (or °F or PU)

per minute. PVRH is a positive value while

PVRL is a negative value.

NOTE

The controller will never revert to its PV/SV display from dis-

play mode unless you press the keys.

3–24 Heater Current Monitoring

TEC99999, a current transformer, should be equipped to meas-

ure the heater current. Select CT

for IN2. The input 2 signal con-

ditioner measures the heater cur-

rent while the heater is powered

and the current value will

remain unchanged while the

heater is unpowered. The PV2

will indicate the heater current.

For information on how to read

PV2 value, please refer to Table

1.4 under PVMD to use as a

process value or SPMD to use as

a setpoint.

NOTES

If the heater to be measured is

controlled by output 1, then

CYC1 should be set for 1 sec-

ond or longer and O1TY should

use RELY, SSRD, or SSR.

Similarly, if the heater to be

measured is controlled by output 2, then CYC2 should be set for

1 second or longer and O2TY should use RELY, SSRD, or SSR

to provide an adequate time for the A to D converter to measure

the signal. Since TEC99999 can detect a full-wave AC current

only, a DC or half-wave AC current can’t be measured.

3–25 Reload Default Values

The default values listed in table 1.4 are stored in the memory

when the product leaves the factory. In certain occasions, it is

desirable to retain these values after the parameter values have

been changed. Here is a convenient way to reload the default val-

ues.

Operation

Press several times until

appears.

Then press . The upper display will show

. Use the up and down keys to select

0 or 1. If °C units are required, select 0 for

FILE and if °F units are required, select 1

for FILE. Then press for at least 3 sec-

onds. The display will flash for a moment

while the default values are reloaded.

CAUTION

The procedure mentioned above will change the previous setup

data. Before performing it, make sure that it is really required.

Accessory installed:

CT94-1

Setup

IN2=CT

O1TY or O2TY=RELY,

SSRD or SSR

CYC1 or CYC2≥1 second

Limitations

1. Linear output type can’t

be used.

2. CYC1 (or CYC2) should

be set for 1 second or

longer to detect heater

current reliably.

3. Only full-wave AC cur-

rent can be detected.

FILE 0

°C default file

FILE 1

°F default file

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 91 92

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Connect-Tek Transa PRO 17 Manual de Instruções Página 44

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