Inductive Loads; External Switch In Series With The Internal Contact; Operating - Eliwell EWTQ925 Bedienungsanleitung

INDUCTIVE LOADS

INDUCTIVE LOADS INDUCTIVE LOADS
INDUCTIVE LOADS INDUCTIVE LOADS
High voltage transients may occur when
switching inductive loads.
These transients may introduce disturbances
through the internal contacts which can affect the
performance of the instrument.
The internal protection (varistors) assures 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.
Fig. 6 EXTERNAL SWITCH IN SERIES WITH
THE INTERNAL CONTACT
In these cases an additional RC network should
be installed across the external contact as shown
in Fig. 6
The value of the capacitor (C) and resistor (R) are
shown in the following table.
LOAD C R
(mA) (mF) ( W )
<40 mA 0.047 100
<150 mA 0.1 22
<0.5 A 0.33 47
In every case the cable connected to the relay
outs must be routed as far away as possible from
input or communication cables.
C
R
POWER
LINE
LOAD
P.

OPERATING

( W ) VOLTAGE
1/2 260 V AC
2 260 V AC
2 260 V AC
VOLTAGE OUTS FOR SSR DRIVE VOLTAGE OUTS FOR SSR DRIVE VOLTAGE OUTS FOR SSR DRIVE
VOLTAGE OUTS FOR SSR DRIVE VOLTAGE OUTS FOR SSR DRIVE
2
OUT 1
1
Fig. 7 SSR DRIVE OUT WIRING
It is a time proportioning out.
Logic level 0 Logic level 0 Logic level 0: Vout < 0.5 V DC. Logic level 0 Logic level 0
Logic level 1 Logic level 1 Logic level 1 Logic level 1: Maximum current = 20 mA. Logic level 1
- 14 V + 20 % @ 20 mA
- 24 V + 20 % @ 1 mA.
NOTE NOTE NOTE NOTE NOTE: This out is NOT isolated.
A double or reinforced Isolation between instrument
output and power supply must be assured by the
external solid state relay.
POWER LINE WIRING POWER LINE WIRING
POWER LINE WIRING POWER LINE WIRING POWER LINE WIRING
N
5
100 V to 240 V AC (50/60Hz)
4
R (S,T)
Fig. 8 POWER LINE WIRING
G B G B G B G B G B
4
+
+
_
SOLID STATE
Power Line
or 24 V AC/DC
_
RELAY