Dwyer DCT600 User Manual download pdf (Page 3)

External Limit Switch Connection

The controller may be used with an external pressure limit switch or sensor to provide

demand-cleaning operation. A three pin terminal block provides connection for exter-

nal high and low limit switches. A simple on-off system can be established with a sin-

gle pressure switch connected to the high limit input. Better control can be achieved

with a high and low limit switch/gage such as the Dwyer Photohelic

pressure gage.

The switches must be isolated contacts between the high or low limit input and the

common connection. The wiring from the switches must be two or three wires with no

other connections made to these. The common line must not be connected to equip-

ment ground or protective ground, since these may introduce electrical noise and

cause improper operation or possible damage to the control board. The operation of

these inputs is summarized as follows:

Operating Modes

Continuous Cycle Mode

The DCT600 has two operating modes available for different applications. Starting

with the most basic mode, it is capable of operating in a continuous cleaning cycle.

This can be initiated by placing a jumper between the high limit input and the com-

mon connection. Two setup parameters control operation: time off, time on. Time on

and time off specifically deal with the solenoid on time and the time interval between

the end of the on pulse and the start of the next.

Demand Mode

Demand mode operation can be configured using the high limit and low limit inputs.

A simple on-off system can be setup with a single pressure switch connected to the

high limit input. Better control can be achieved with a high and low limit switch set

such as is provided in the Photohelic

pressure gage. In this on-demand mode, time

on and time off may be programmed to define the cleaning cycle. When the cleaning

cycle is completed, the controller will continue the cycle until the last channel is

pulsed. The next cleaning cycle will always start on channel 1. A factory installed

option is available. A factory installed option is available that will not clean to the end

of a cycle, but rather stop where the cleaning cycle ended. The next demand for

cleaning will start where the last cleaning cycle left off.

System Setup

Last Channel Selection DCT604, DCT606, DCT610

A jumper connector is provided on the DCT610, DCT606, and DCT604 to select the

last channel used. Place the jumper on the two pins corresponding to the last chan-

nel used in the installation.

Last Channel Selection DCT622, DCT632

The DCT622 and DCT632 use a set of 5 switches to select the last channel. If the

selected last channel is greater than the number of channels available then the con-

troller will cycle through only the available channels. The following table defines the

switch settings for each of the last channel selections. For convenience this table is

also provided on the board below the switch.

Time Off and Time On Setup

Time off defines the period of time between solenoid activations when no channels

are enabled. This value may be set between 1 second and 200 seconds with a reso-

lution of 1 second. Time on defines the solenoid on time. The value may be set

between 50 msec and 500 msec with a resolution of 10 msec. If adjustments are

made while the system is in operation, the new setting will take effect in the following

solenoid cycle. Do not use excessive force to turn the potentiometers. This will dam-

age the unit. A factory installed option is available for a time on range of 0.05 to 10

seconds.

0.31 TYP [7.87]

4 PLACES

7.73

[196.3]

8.88

[225.6]

4.00 TYP

[101.6]

5.74

[145.8]

4.45

[113.0]

4.00

[101.6]

Weatherproof Enclosure Option

DCT604, DCT606, DCT610

0 = Off, 1 = On

Current

Operation

Hold

Hold or Run

Hold

Run

Hold

Run

Low Limit

Switch

Open

Closed

≠

High Limit

Switch

Open

Closed

Open

≠

Open

Operation

Hold

Run

Hold

Run

Hold

Ø – Transition from open to closed

≠ – Transition closed to open

X – Either open or closed

Channel

Switch

00000

00001

00010

00011

00100

00101

00110

00111

01000

01001

01010

Channel

Switch

01011

01100

01101

01110

01111

10000

10001

10010

10011

10100

10101

Channel

Switch

10110

10111

11000

11001

11010

11011

11100

11101

11110

11111

E-99:DCT500 bulletin 7/8/09 8:17 AM Page 3

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DWYER INSTRUMENTS, INC 1

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Dwyer DCT600 User Manual Page 3

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