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3. Overview of the parts
Figure 2 shows those parts of the device of consequence for
mounting, electrical connections, configuration switch and
other operations described in the Operating Instructions.
(5)
Fig. 2
(5)
Type label
(6)
Fastener
(7)
Configuration switch
ON
Green LED for signalling operating status
LED1,
LED2 Yellow LED's for status display of
the relays A1 and A2
Red LED for open and short-circuit monitor (both inputs)
4. Brief description
The isolating switch amplifier SIRAX SV 824 is used for
transferring binary signals.
The amplifier input may be either a sensor conforming to
DIN EN 50 227 or a contact. Input and output signals are
electrically insulated. The output is either an auxiliary relay
with a potentially-free changeover contact.
Yellow LED's on the front of the unit signal energised output
relays. The relationship of the output can be configured with
the aid of switches which are also located on the front of the
unit.
Provision is made for monitoring the input with respect to
open and short-circuits. Should one of these faults occur, the
output relay of the channel concerned resets and the fault is
signalled by the red LED on the front of the unit. The
monitoring circuit is enabled by a switch (e.g. for use with
mechanical transmitter contacts).
The instrument fulfils all the important requirements and
regulations concerning electromagnetic compatibility EMC
and Safety (IEC 1010 resp. EN 61 010). It was developed and
is manufactured and tested in strict accordance with the
quality assurance standard ISO 9001.
16
(6)
(7)
LED1
LED2
ON
5. Technical data
Signal inputs
(for channels I and II)
Type:
Binary signals,
preferably from contactless sen-
sors acc. to DIN EN 50 227, in type
of protection "Intrinsic safety"
EEx ia IIC
Number:
2 (S1 and S2)
signal inputs S1 and S2 have a
common ground
Operating data
Open-circuit voltage:
Approx. 8.5 V DC
Internal resistance:
Approx. 1.1 kΩ
Short-circuit current:
Approx. 8 mA
Switching level:
Off I ≤ 1.2 mA, On I ≥ 2.1 mA
Hysteresis:
0.2 mA
Line resistance:
Max. 50 Ω
Output contacts
Output A1 and A2:
Output contacts for channels I and
II galvanically isolated
Table 1:
Version of the output A1 and A2
Material
Symbol
Gold flashed
silver alloy
Relay approved by UL, CSA, SEV, VDE, SEMKO, ÖVE, EI,
BSI, FIMKO
Mechanical life:
> 5 · 10
Switching delay:
Approx. 50 ms
Direction of action
of the output contacts
A1 and A2:
Adjustable by switch
Maximum switching frequency
Input-relay output:
≤ 10 Hz
Signal input monitoring
Behaviour:
Circuit break and shorting are
signalled by the red LED and the
output of the corresponding chan-
nel is disabled.
Pick-up level
according to
DIN EN 50 227:
Short-circuit I > approx. 6.3 mA
Open-circuit I < approx. 0.15 mA
Contact rating
AC: ≤ 2 A / 250 V
(500 VA)
DC: ≤ 1 A / 0.1...250 V
(30 W)
6
operations
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