ero electronic LFS-mA Manuel De Service page 9

INDUCTIVE LOADS INDUCTIVE LOADS INDUCTIVE LOADS INDUCTIVE LOADS 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 the OUT 2 and OUT 3, 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. 9.
C
R
LOAD
Fig. 9 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. 9
The value of capacitor (C) and resistor (R) are
shown in the following table.
LOAD C R
P. OPERATING
(mA) (µF) (Ω) ( W ) VOLTAGE
<40 mA 0.047 100
1/2 260 V AC
<150 mA 0.1 22
2 260 V AC
<0.5 A 0.33 47 2 260 V AC
The cable involved in relay output wiring must be
as far away as possible from input or communica-
tion cables.
LFSMA-1-B.pmd 6
LINEAR OUTPUT LINEAR OUTPUT LINEAR OUTPUT LINEAR OUTPUT LINEAR OUTPUT
This instrument is equipped with one linear output
(OUT 1) programmable as:
- main output (heating or cooling)
- secondary output (cooling)
- analog retransmission of the measured value
- analog retransmission of the operative set point.
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OUT 1
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7
POWER
LINE
Fig. 10 mA OUTPUT WIRING
It is an isolated analog output.
Maximum load: 500 Ω.
GB GB GB GB GB 6
29/05/2006, 9.23
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