Siemens 7SR18 Solkor - Binary (Digital) Outputs; Binary (Digital) Inputs

7SR18 Performance Specification
Unrestricted Page 8 of 44 ©2018 Siemens Protection Devices Limited
1.2.3.1 Burden
Attribute Value
AC Burden - 0.02 VA @ 63.5 V , ≤ 0.06 VA @ 110 Vrms
1.2.3.2 Thermal Withstand
Attribute Value
Overvoltage Withstand (Continuous) (1 hour) 300 Vrms
1.2.4 Binary (Digital) Outputs
Contact rating to IEC 60255-1
Attribute Value
Carry continuously 5 A AC or DC
Make and carry
(L/R ≤ 40 ms and V ≤ 300 V)
for 0.5 s 20 A AC or DC
for 0.2 s 30 A AC or DC
Break
( ≤ 5 A and ≤ 300 V)
AC resistive 1250 VA
AC inductive
250 VA at p.f. ≤ 0.4
DC resistive 75 W
DC inductive
30 W at L/R ≤ 40 ms
50 W at L/R ≤ 10 ms
Contact Operate / Release Time 7 ms / 3 ms
Minimum number of operations 1000 at maximum load
Minimum recommended load 0.5 W at minimum of 10 mA or 5 V
1.2.5 Binary (Digital) Inputs
DC operation
Nominal Operating Range
V
BI
19 V DC 17 V DC to 320 V DC
88 V DC 74 V DC to 320 V DC
AC operation
Nominal Operating Range
V
BI
19 V DC 92 V
RMS
to 138 V
RMS
1.2.5.1 DC Performance
Attribute Value
Maximum DC current for
operation
V
BI
= 19 V 1.5 mA
V
BI
= 88 V 1.5 mA
Reset/Operate voltage ratio
≥ 90%
Response time < 9 ms
Response time when programmed to energise an
output relay contact (i.e. includes output relay
operation)
< 20 ms
The binary inputs have 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 achieve immunity from AC interference, a BI pick-up delay of typically one-cycle can be applied.