Chromalox 1604 User Manual download pdf (Page 24)

21

MANUAL FUNCTION

The MANUAL mode function can be accessed

(only if enabled by P26=On) by depressing the

MAN pushbutton for more than 1 sec.

The command is accepted and executed only if

the display is in "Normal Display Mode".

When in MANUAL mode the LED's MAN

annunciator will light up while the lower display

shows the power output values.

The value of OUT 1 is shown in the two most

significant digit field while the value of OUT 2 (if

present) is shown in the two less significant digit

field.

The decimal point between the two values will be

flashing to indicate instrument in manual mode.

Note: A graphic symbol "

" is used for

OUT1 = 100

A graphic symbol " " is used for

OUT2 = 100

The power output can be modified by using s

and t pushbuttons.

By depressing, for more than 1 second, MAN

pushbutton the device returns in AUTO mode.

The transfer from AUTO to MANUAL and

viceversa is bumpless (this function is not

provided if integral action is excluded).

If transfer from AUTO to MANUAL is performed

during the first part of SMART algorithm (TUNE)

when returning in AUTO the device will be forced

automatically in the second part of the SMART

algorithm (ADAPTIVE).

At power up the device will be in the AUTO mode

or as it was left prior to power shut down

depending on P33 configuration selection.

Note: When start up occurs in Manual mode the

power output (OUT1 - OUT2) is set to 0.

SERIAL LINK

The device can be connected to a host computer

by a serial link.

The host can put the device in LOCAL (functions

and parameters are controlled via keyboard) or in

REMOTE (functions and parameters are

controlled via serial link).

The REMOTE status is signalled by the decimal

point (labelled REM) at the right hand of the LSD

of the upper display.

This instrument allows to modify the operative

and configuration parameters, via serial link.

The necessary conditions to implement this

function are the following:

1) Serial parameters from SEr1 to SEr4 should be

properly configured using the standard front

keyboard procedure

2) Device must be in the OPERATING mode

During the downloading configuration the device

goes in open loop with all output in OFF state.

At the end of configuration procedure, the device

performs an automatic reset and then returns to

close loop control.

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