Connect-Tek Transa PRO 17 Manual de Instruções descarregar pdf (Página 51)

5–1 Pump/Pressure Control

Regulated water supply systems are widely used in residential

areas, water plants, chemical plants, electrical plants, semicon-

ductor plants, etc. By taking advantage of its PUMP function, the

TEC-9300 can be used to create an economical yet versatile solu-

tion for these applications. Here is an example:

The water pressure in this example must be controlled at

10Kg/cm≈. To achieve this, the following devices are used for

this example:

Inverter: To supply a variable frequency AC voltage to the

motor.

Motor: A 3-Ø induction motor.

Pump: Any appropriate economical type of pump.

Pressure Sensor: A three-wire or two-wire type of pressure

transducer with a 0–20Kg/cm≈ range.

Pressure Reservoir: Provides smoother pressure for the

system.

TEC-9300: Order a TEC-9300 with standard input, 4–20mA

output 1, 20V DC output 2 for sensor power.

Set the following parameters in the setup menu:

Adjust the following parameters

in the user menu:

A1SP: optional

REFC = 3

PB1 = 10.00

TI1 = 1

TD1 = 0.2

SP2 = -0.50

PL1 = 100

Refer to section

4-12 for more

details.

FUNC = FULL

COMM: optional

IN1 = 4-20

IN1U = PU

DP1 = 2-DP

IN1L = 0

IN1H = 20.00

IN2 = NONE

OUT1 = REVR

O1TY = 4-20

O1FT = 0

OUT2 = DCPS

A1FN: optional

EIFN = NONE

PVMD = PV1

FILT = 1

SELF = NONE

SLEP = NONE

SPMD = PUMP

SP1L = 5.00

SP1H = 15.00

SP2F = DEVI

Chapter 5 Applications

Key menu:

SPMD

SP2F

REFC

SP2

5–2 Variable Period Full Wave SSR

(VPFW SSR)

VPFW SSR is a variable period full wave solid-state relay. It can

provide a zero cross output with superior controllability com-

pared to a conventional SSR with a fixed time base. The block

diagram of VPFW SSR is shown as follows:

Unlike a conventional SSR, the VPFW SSR always gives the out-

put an even number of half cycles (full wave) as shown in the fol-

lowing diagram.

The VPFW switches the load without DC current, minimizing the

harmonic current and stress on the load. This prolongs the load

life.

Since the duty cycle (i.e., output power level) of the control input

is small, the off-period will be extended to keep the output reso-

lution such that the conversion error is minimized. As low as

0.1% timing error can be achieved. Hence, VPFW SSR is partic-

ularly suitable for smoother control.

Figure 5.2

Block Diagram of VPFW SSR

NOTES:

1. The VPFW SSR can be used to drive a resistant load and some

types of inductance loads such as relay, contactor, magnetic

switch, solenoid valve, etc. However, it can not drive a motor

or capacitance load.

2. Only AC power can supply VPFW SSR, otherwise it will not

operate properly.

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Connect-Tek Transa PRO 17 Manual de Instruções Página 51

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