Chromalox 1604 User Manual download pdf (Page 9)

INDUCTIVE LOADS

High voltage transients may occur switching

inductive loads.

Through the internal contacts these transients

may introduce disturbances which can affect the

performance of the instrument.

For all the outputs, the internal protection

(varistor) assures a correct protection up to 0.5 A

of inductive component.

The same problem may occur when a switch is

used in series with the internal contacts as shown

in Fig. 10.

Fig. 10 EXTERNAL SWITCH IN SERIES WITH

THE INTERNAL CONTACT

In this case it is recommended to install an

additional RC network across the external contact

as show in Fig. 10

The value of capacitor (C) and resistor (R) are

shown in the following table.

The cable involved in relay output wiring must be

as far away as possible from input or communica-

tion cables.

C) RELAY OUTPUTS

Fig. 9 RELAY OUTPUTS WIRING

The contact rating of the OUT 1 is 3A/250V AC

on resistive load.

The contact rating of the OUT 2 and 3 is 2A/250V

on AC resistive load.

The number of operations is 1 x 10

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.

All 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.

OUT 1

(heating or

cooling)

OUT 2

(cooling /AL1)

OUT 3

(AL 2)

NO - OUT 2

C - OUT 2/3

NO - OUT 3

LOAD

POWER

LINE

LOAD

(mA)

<40 mA

<150 mA

<0.5 A

(mF)

0.047

0.1

0.33

(W)

100

(W)

1/2

OPERATING

VOLTAGE

260 V AC

1604-1-BC.p65 5/16/00, 10:25 AM6

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 39 40

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Chromalox 1604 User Manual Page 9

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