op. set point
SP
SP2

B)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

C) RELAY OUTPUTS

1

OUT 2

3

OUT 3

2

NO - OUT 2

NO - OUT 3

C - OUT 2 and 3

SP / SP2

14

15

Fig. 7 - LOGIC INPUT WIRING

This logic input allows to select the operative set point.

logic input

open close

Fig. 8 RELAY OUTPUTS WIRING

The contact rating of the OUT 2, 3 is 2A/250V AC on resistive load.

The number of operations is 1 x 105 at specified rating.

NOTES 1) To avoid electrical shock, connect power line at the end of the wiring procedure.

2)For power connections use No 16 AWG or larger wires rated for at last 75 °C.

3)Use copper conductors only.

4)Don’t run input wires together with power cables.

The relay contacts are protected by varistor against inductive load with inductive component up to 0.5 A.

The following recommendations avoid serious problems which may occur, when using relay output for driving inductive loads.

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1604-7-1-AB.p65

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Chromalox 1604-7 user manual Logic Input Safety note, Relay Outputs