Connect-Tek Transa PRO 17 Manual de Instruções descarregar pdf (Página 48)

4–7 Output Power Limits

In certain systems the heater (or cooler) is over-

designed such that the process is too heavily heated

or cooled. To avoid an excessive overshoot and/or

undershoot you can use the power limit function.

Output 1 power limit PL1 is contained in the user

menu. If output 2 is not used for cooling (that is, COOL is not

selected for OUT2), then PL2 is hidden. If the controller is used

for ON-OFF control, then both PL1 and PL2 are hidden.

Operation:

Press for 3 seconds, then press several times to reach PL1

and PL2. PL1 and PL2 are adjusted by using the up and down

keys with range of 0–100%.

Example:

OUT2=COOL, PB1=10.0°C, CPB=50, PL1=50, PL2=80

Output 1 and output 2 will act as the following curves:

NOTE:

The adjustment range of MV1 (H) and MV2 (C) for manual con-

trol and/or failure transfer are not limited by PL1 and PL2.

4–8 Data Communication

Two types of interfaces are avail-

able for data communication.

These are the RS-485 and RS-

232 interfaces. Since RS-485

uses a differential architecture to

drive and sense signal instead of

a single ended architecture

which RS-232 uses, RS-485 is

less sensitive to noise and more

suitable for communication over

longer distances. RS-485 can

communicate without error over

a distance of 1km while RS-232

is not recommended for dis-

tances over 20 meters.

Using a PC for data communica-

tion is the most economical method. The signal is transmitted and

received through the PC communication port (generally RS-232).

Since a standard PC can’t support an RS-485 port, a network

adapter (such as TEC99001) has to be used to convert RS-485 to

RS-232 for a PC if RS-485 is required for data communication.

Up to 247 RS-485 units can be connected to one RS-232 port;

therefore a PC with four comm ports can communicate with 988

units.

Setup

Enter the setup menu.

Select FULL (full function) for

FUNC.

Select 485 for COMM if RS-485

is required, or 232 if RS-232 is

required. Select RTU (i.e.,

Modbus protocol RTU mode )

for PROT. Set individual

addresses for any units that are

connected to the same port. Set

the baud rate (BAUD), data bit

(DATA), parity bit (PARI) and

stop bit (STOP) so that these val-

ues are accordant with the PC

setup conditions.

NOTE: If the TEC-9300 is con-

figured for RS-232 communica-

tion, the EI (event input) is dis-

connected internally. The unit

can no longer perform event

input function (EIFN).

When you attach an RS-232

module (TEC-102-103) to the

connectors on the CPU board,

you also need to modify jumper

JP22 according to section 2-16.

If you use a conventional 9-pin

RS-232 cable instead of CC94-1,

the cable should be modified for

the proper operation of RS-232

communications according to

section 2-16.

PL1

PL2

RS-485 Benefits:

Long distance

Multiple units

RS-232 Benefits:

Direct connection to a PC

RS-485 Setup

FUNC = FULL

COMM = 485

PROT = RTU

ADDR = Address

BAUD = Baud Rate

DATA = Data Bit Count

PARI = Parity Bit

STOP = Stop Bit Count

RS-485 Terminals

TX1

TX2

RS-232 Setup

FUNC = FULL

COMM = 232

PROT = RTU

ADDR = Address

BAUD = Baud Rate

DATA = Data Bit Count

PARI = Parity Bit

STOP = Stop Bit Count

RS-232 Terminals

TX1

TX2

COM

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