Chromalox 1604 User Manual download pdf (Page 12)

OPEN INPUT CIRCUIT

This instrument is able to identify the open circuit

for TC and RTD inputs.

The open input circuit condition for RTD input is

shown by an "overrange" indication.

For TC input, it is possible to select overrange

indication (standard) or underrange indication set-

ting the CH101 and SH101 according to the follow-

ing table:

Overrange (STD) CH101 = close SH101 = open

Underrange CH101 = open SH101 = close

Both pads are located on the soldering side of the

CPU card

Fig. 15

PRELIMINARY HARDWARE

SETTINGS

1) Remove the instrument from its case.

2) It is necessary to set J106 according to the

desired input type as shown in the following figure.

INPUT J106

TYPE 1-2 3-4 5-6 7-8 9-10

TC-RTD open close open open open

60 mV open close open open open

5 V close open close open open

10 V open open close open open

20 mA open open open close close

NOTE : the not used jumper can be positioned on

pin 7-9

CH101

SH101

1 3 5 7 9

2 4 6 8 10

J106

V101

J102

Fig. 14

3) Select the output 1 contact : NO (standard) or

NC by setting J102 according to the following

table:

Contact NO (standard) NC

J102 1 - 2 2 - 3

1604-1-BC.p65 5/16/00, 10:25 AM9

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 39 40

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Chromalox 1604 User Manual Page 12