ero electronic LDS Manuel De Service page 8

INDUCTIVE LOADS INDUCTIVE LOADS INDUCTIVE LOADS INDUCTIVE LOADS INDUCTIVE LOADS
High voltage transients may occur when switching
inductive loads.
Through the internal contacts these transients
may introduce disturbances which can affect the
performance of the instrument.
The internal protection (varistor) assures a correct
protection up to 0.5 A of inductive component but
the OUT 1 NC contact is not protected.
The same problem may occur when a switch is
used in series with the internal contacts as shown
in Fig. 7.
C
R
LOAD
Fig. 7 EXTERNAL SWITCH IN SERIES WITH
THE INTERNAL CONTACT
In this cases it is recommended to install an
additional RC network across the external contact
as show in Fig. 7
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
Anyway the cable involved in relay output wiring
must be as far away as possible from input or
communication cables.
lxs-1-0f.pmd 4
VOLTAGE OUTPUTS FOR SSR DRIVE VOLTAGE OUTPUTS FOR SSR DRIVE VOLTAGE OUTPUTS FOR SSR DRIVE VOLTAGE OUTPUTS FOR SSR DRIVE VOLTAGE OUTPUTS FOR SSR DRIVE
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8
OUT 1
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7
Fig. 8 SSR DRIVE OUTPUT WIRING
It is a time proportioning output.
Logic level 0: Vout < 0.5 V DC. Logic level 0 Logic level 0 Logic level 0 Logic level 0
Logic level 1: Logic level 1 Logic level 1 Logic level 1 Logic level 1
- 14 V + 20 % @ 20 mA
- 24 V + 20 % @ 1 mA.
POWER
Maximum current = 20 mA.
LINE
NOTE NOTE NOTE: This output is not isolated. NOTE NOTE
A duble or reinforced Isolation between instrument
output and power supply must be assured by the
external solid state relay.
GB GB GB GB GB 4
16/01/2004, 9.29
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SOLID STATE
RELAY