Watlow VPAC-AT Remote Mount Transformer Manual de usuario descargar pdf

General Description

The AT card (Watlow P/N 08-5422) provides a delayed

SCR turn ON, providing an infinitely variable voltage and

current from full OFF to full ON. The AT card can be

used on resistive, inductive, or Tungsten lamp loads. It

includes a 2-4 second soft start on power up, and a one

second soft start on input signal step change. The AT

also includes a missing half cycle detector to put it into

emergency shutdown (ESD), and retrigger the soft start.

A low signal on the ESD terminals puts the unit into

ESD. The input is factory set for 4-20mA into 250Ω. It

can be converted to a voltage input by removing R2 and

readjusting the bias and gain potentiometers for any volt-

age from 0-3VÎ (dc) to 0-15VÎ (dc). Without R2, it is a

5K input impedance. See the illustration on the reverse

side.

AT card power supply requirements are 24VÅ (ac) cen-

ter tap transformer secondary. Transformer primary

must be connected to the same line phase as the heater

load. For example, is the heater is powered by L1 and

L2, then the power transformer must also be connected

to L1 and L2. See the illustration on the reverse side.

Dimensions

Specifications

(1274)

Input

• Process input factory set @ 4-20mA Î (dc)

• Input impedance 250Ω (clip resistor for 5KΩ voltage

input), or manual control input

• Soft start approximately 2-4 seconds upon power-

up, 1 second upon set point change

Output

• Phase angle control

• TTL compatible (5V logic) at about 5mA @ 5V. Will

drive one industry standard 3-32VÎ (dc) input ran-

dom fire SSR. For single phase only.

Line Voltage Power

• 50/60 Hz V~ (ac) line frequency

• Voltage ±10%, 120, 208, 240, 277, 380, 415, 480V~

(ac). Power transformer is supplied with the AT

card. When ordering, specify power supply voltage

and line frequency.

Line Voltage Compensation

• 10%∆ in line, 2%∆ in load in the 30% to 70% power

region.

Input to Output Linearity

• 2%, 30% to 70% power region

Operating Environment

• 32 to 122°F (0 to 50°C)

Storage Temperature

• -40 to 185°F (-40 to 85°C)

Options

• Manual control kit for voltage input cards (1KΩ

potentiometer) #08-5362. Includes dial, knob, 1KΩ

pot and wiring.

Ordering Information

• Watlow P/N 08-5422

Watlow Controls

1241 Bundy Blvd., P.O. Box 5580

Winona, MN 55987-5580

Phone: 507-454-5300, Fax: 507-452-4507

0600-0028-0001 Rev D Made in the U.S.A.

August, 1999 Printed on Recycled Paper

10% Postconsumer Waste

VPAC-AT

Remote Mount Transformer

Data Sheet

(1275)

1 2

Indice de contenidos

Pagina 1 - VPAC-AT

General DescriptionThe AT card (Watlow P/N 08-5422) provides a delayedSCR turn ON, providing an infinitely variable voltage andcurrent from full OFF t

Pagina 2 - Remote Mount Transformer

Note:The controls transformer mustbe on the same phase as theload. See wiring diagram. Allhot lines to the transformershould be fused at 1 amp witht

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Watlow VPAC-AT Remote Mount Transformer Manual de usuario

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