Hardware Modifications; Disassembly - Siemens 7SC80 Manual

[formel-rmin-260602-kn, 1, en_US]
Ι
BI(HIGH)
V
BI min
V
CTR
R
CBC
V
CBC (LOW)
For the power consumption of the resistance:
[formel-leistungvon-r-260602-kn, 1, en_US]
Example
Ι
BI (HIGH)
V
BI min
V
CB
R
CBC
V
CBC (LOW)
[beispiel-rmax-110111, 1, en_US]
[beispiel-rmin-20061211, 1, en_US]
[beispiel-rmittelwert-110111, 1, en_US]
The closest standard value 200 kΩ is selected; the following applies for the power:
[beispiel-leistungvonr-20061211, 1, en_US]

Hardware Modifications

3.1.2
3.1.2.1

Disassembly

Replacing the Buffer Battery
The battery is located in a battery compartment which is accessible from outside. The battery compartment
can be found on the side of the device. When replacing the battery, it is not necessary to open the device. In
the case of a failure of the auxiliary voltage, the battery ensures operation of the internal clock and storage of
all process data for at least half a year. The device parameterization is always stored in a failsafe way in a
nonvolatile memory. The device cyclically checks the charge state of the battery.
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
Constant current with activated BI ( = 0.25 mA)
Minimum control voltage for BI (= 17 V)
Control voltage for trip circuit
Ohmic resistance of the circuit breaker coil
Maximum voltage on the circuit breaker coil that does not lead to tripping
0.25 mA (SIPROTEC 4 7SC80)
17 V for all nominal voltages
110 V (from the system/trip circuit)
500 Ω (from the system/trip circuit)
2 V (from the system/trip circuit)
Mounting and Commissioning
3.1 Mounting and Connections
453