Watlow Series 920 Microprocessor-Based Ramping Control Manuel d'utilisateur télécharger pdf (Page 64)

RTD

Field Calibration Procedure

Figure

Decade Resistance

Box-to-Series 920

Connection Diagram

Equipment Required

100 ohm precision decade resistance box with 0.00 ohms resolution.

4-1/2

digit, digital voltmeter (DVM).

Setup and Calibration

NOTE:

Before calibration on an installed control, make sure all data and

parame-

ters are documented.

Connect the precision decade box to #1 ,

#2,

and

of the Series 920

terminal

strip as shown in the figure below.

Series

920

Terminal Strip

@)(sJ(g;

General Radio Model

#1433-T

Connect AC line voltage,

#17,

#20,

ground to

#21.

Set DIP switch

ON. Apply power to the Series 920 and allow it to warm

up for

minutes. The unit should be in the TEST mode.

Using the MODE key, advance until the IN

parameter appears in the

alphanumeric display. Using the UP/DOWN keys, advance to your correct

RTD

input type. Press the ENTER key.

Connect DVM common to TP84 and DVM positive to TP36 on the

AOO7-

1703 circuit board. Located on the top side behind the center chassis

support.

DVM should be set up for DC volts, and in a range capable of

displaying 32.00 millivolts

0mV.

WATLOW Series 920 User’s Manual

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Watlow Series 920 Microprocessor-Based Ramping Control Manuel d'utilisateur Page 64

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