Chromalox 1604 User Manual download pdf (Page 8)

5

B.1) LOGIC INPUT

This instrument can use the input "IN CT/SP-

SP2" (connections 14 and 15) as current

transformer input or logic input.

Safety note:

1) Do not run logic input wiring together with

power cables.

2) Use an external dry contact capable of

switching 0.5 mA, 5 V DC.

3) The instrument needs 100 ms to recognize a

contact status variation.

4) The logic inputs are NOT isolated by the

measuring input.

5) This feature excludes the current transformer

input.

Fig. 7 - LOGIC INPUT WIRING

When the logic input is selected, it is used to

switch, by an external contact, from main set

point to second set point and viceversa.

logic input op. set point

open SP

close SP2

14

IN CT/SP-SP2

15

B.2) CURRENT TRANSFORMER INPUT

This instrument can use the input "IN CT/SP-

SP2" (connections 14 and 15) as current

transformer input or logic input.

Safety note:

1) Do not run current transformer input wiring

together with AC power cables.

2) The minimum active period to perform this

measurement is equal to 400 ms.

3) This feature excludes the logic input function.

4) The input impedance is equal to 10 W.

Fig. 8 - CURRENT TRANSFORMER INPUT

WIRING

This input allows to measure and display the

current running in the load driven by the

OUTPUT1 during the ON and OFF period of the

OUT 1 cycle time. By this feature it is also

available the "OUT 1 failure detection" function

(see page 20).

14

15

Load

Current

transformer

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