Binary (Digital) Outputs; Binary (Digital) Inputs - Siemens 7SR242 Duobias Technical Manual

1.2.4

Binary (Digital) Outputs

Contact rating to IEC 60255-0-2
Attribute
Carry continuously
Make and carry
(L/R 40 ms and V 300 V)
Break
( 5 A and 300 V)
Contact Operate / Release Time
Minimum number of operations
Minimum recommended load
1.2.5

Binary (Digital) Inputs

Nominal
19 VDC
V
BI
88 VDC
1.2.5.1 Performance
Attribute
Maximum DC current for
operation
Reset/Operate voltage ratio
Response time
Response time when programmed to energise
an output relay contact (i.e. includes output
relay operation)
The binary inputs are opto couplers having a low minimum operate current and may be set for high speed
operation. Where a binary input is both used to influence a control function (e.g. provide a tripping function) and it
is considered to be susceptible to mal-operation due to capacitive currents, the external circuitry can be modified
to provide immunity to such disturbances.
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.
To achieve immunity from AC interference, a BI pick-up delay of typically one-cycle can be applied.
©2015 Siemens Protection Devices Limited
Value
5A AC or DC
for 0.5 s 20A AC or DC
for 0.2 s 30A AC or DC
AC resistive 1250 VA
AC inductive 250 VA at p.f.
DC resistive 75 W
30 W at L/R
DC inductive
50 W at L/R
6ms / 3ms
1000 at maximum load
0.5 W at minimum of 10mA or 5V
Operating Range
17 to 290 VDC
74 to 290 VDC
Value
V = 19 V 1.5mA
BI
V = 88 V 1.5mA
BI
90 %
< 7ms
< 20ms
Chapter 3) 7SR242 Duobias Performance Specification
0.4
40ms
10ms
Chapter 3 Page 11 of 50