Connect-Tek Transa PRO 17 Manual de Instruções descarregar pdf (Página 49)

4–9 Analog Retransmission

Analog retransmission is available for

model number TEC-9300-XXXXXN

where N=3, 4 or 5. See ordering code in

section 1-2.

Setup

Select FULL for FUNC in the setup menu.

Select a correct output signal for COMM

which should be accordant with the

retransmission option used. Five types of

retransmission output are available. These

are: 4–20mA, 0–20mA, 0–5V, 1–5V and

0–10V. There are eight types of parameters

that can be retransmitted according to the

analog function (AOFN) selected. These

are: PV1, PV2, PV1–PV2, PV2–PV1, SV, MV1, MV2 and

PV–SV. Refer to table 1.4 for a complete description. Select a

value for AOLO corresponding to output zero and select a value

for AOHI corresponding to output SPAN.

How to determine output signal:

AOLO and AOHI are set to map to output signal low SL (e.g.,

4mA) and output signal high SH (e.g., 20mA) respectively. The

analog output signal AOS, corresponding to an arbitrary value of

parameter AOV, is determined by the following curve.

Notes:

The setup values used for AOHI and

AOLO must not be equal, otherwise,

incorrect values will occur. However,

AOHI can be set either higher or lower

than AOLO. If AOHI is set higher than

AOLO it could result in a direct conver-

sion. If AOHI is set lower than AOLO it

could result in a reverse conversion.

Example

A control uses a 4–20mA analog output to retransmit the differ-

ence value between input 1 and input 2 (PV1–PV2). It is required

that if the difference value is -100, 4mA will be exported, and if

the difference value is 100, 20mA will be exported. Make the fol-

lowing setup for TEC-9300:

IN1U=PU, DP1=NODP, IN2U=PU, DP2=NODP, FUNC=FULL,

COMM=4-20, AOFN=P1-2, AOLO (low side of scale) =-100,

AOHI (high side of scale)=100

4–10 Digital Filter

In certain applications the process

value is too unstable to be read. A

programmable low-pass filter

incorporated in the TEC-9300 can

be used to improve this. This is a

first order filter with the time con-

stant specified by the FILT

parameter which is in the setup menu. The default value of FILT

is set at 0.5 seconds before shipping. Adjust FILT to change the

time constant from 0 to 60 seconds. 0 seconds means no filter is

applied to the input signal. The filter is characterized by the fol-

lowing diagram.

Note

The filter is available only for PV1, and is performed for the dis-

played value only. The controller is designed to use unfiltered sig-

nal for control even if the filter is applied. A lagged (filtered) sig-

nal, if used for control, may produce an unstable process.

4–11 Sleep Mode

To enter sleep mode:

Set FUNC for FULL to pro-

vide full function.

Select YES for SLEP to enable

sleep mode.

Press for 3 seconds;

the unit will now enter sleep

mode.

During sleep mode:

1. All displays are shut off

except a decimal point which is lit periodically.

2. All outputs and alarms are shut off.

To exit sleep mode:

1. Press to leave the sleep mode.

2. Disconnect the power.

The sleep function can be used in place of a power switch to

reduce the system cost.

Default: SLEP=NONE, sleep mode is disabled.

Note: If sleep mode is not required by your system, NONE

should be selected for SLEP to disable sleep mode.

NOTES

AOHI ≠ AOLO

AOHI > AOLO:

Direct

conversion

AOHI < AOLO:

Reverse

conversion

Setup Menu

Terminals

AO+

AO–

FILT

Filter is used to stabilize

the process display.

Sleep mode features:

Shut off display

Shut off outputs

Green power

Replaces power switch

Setup menu

FUNC = FULL

SLEP = YES

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