Siemens 7SR224 - Binary (Digital) Inputs

7SR224 Argus Performance Specification
1.2.5 Binary (Digital) Inputs
Nominal Operating Range
19 VDC 17 to 290 VDC
V
BI
88 VDC 74 to 290 VDC
1.2.5.1 Performance
Attribute Value
V
BI
= 19 V 1.5mA
Maximum DC current for
operation
V
BI
= 88 V 1.5mA
Reset/Operate voltage ratio
≥ 90 %
Typical response time < 7ms
Typical response time when programmed to
energise an output relay contact
< 20ms
The binary inputs have a low minimum operate current and may be set for high speed operation. To achieve
immunity from AC interference, a BI pick-up delay of typically one-cycle can be applied. The default pick-up time
delay of 20ms will provide this immunity.
The standard EATS 48-4 specifies additional performance requirements to provide greater security against
external disturbances. This standard can be applied to applications where a binary input is used to influence a
control function (e.g. provide a tripping function) and the wiring is considered to be susceptible to capacitive
currents, but double pole switching is not applied. See Chapter 7 Applications Guide.
To comply with EATS 48-4, classes ESI 1 and ESI 2, external components / BI pick-up delays are required as
shown in fig. 1-1.
©2010 Siemens Protection Devices Limited Chapter 3 Page 9 of 49