Auxiliary Timer Accuracy; Indication; Settings And Configuration; Recording - Siemens 7SG23 MSCDN – MP2A Manual

220 / 250V
3.8.2 Status Input PU Timer
Each status input has an associated timer that can be programmed to give time-delayed pick-up. The pick-up timers
can be set to 20ms to provide immunity to an AC input signal. Status inputs will then not respond to the following:
•
250V RMS 50Hz applied for two seconds through a 0.1μF capacitor.
•
500V RMS 50Hz applied between each terminal and earth.
•
Discharge of a 10μF capacitor charged to maximum DC auxiliary supply voltage.
Accuracy
Timing

3.9 Auxiliary Timer Accuracy

Auxiliary Timers are those timers created in Reylogic, whose delay settings appear in the REYLOGIC ELEMENTS
MENU
Accuracy
Setting
0 ms
> 0 ms

3.10 Indication

There are two types of LED indication, General and Protection Healthy.
Case Size
All General LED indication is fully configurable by the user. All General indications are stored in non-volatile memory
without the use of an internal backup battery.

3.11 Settings And Configuration

Settings changes may be done via the front panel user-friendly fascia keypad and LCD or via standard Reydisp
Evolution windows software either locally or remotely. Settings changes are stored in EEPROM memory.
Configuration changes may be achieved locally via the front serial port with a Windows based toolbox support
package. Configuration changes and software upgrades are stored in Flash EPROM memory.

3.12 Recording

Up to 5 fault records may be stored within the relay, Fault records are accessible via the front panel showing the date
and time of trips. New faults automatically overwrite the oldest fault record when they occur.
Waveform records are automatically stored whenever a trip is generated. Waveform recording can also be triggered
by the status inputs. New waveform records automatically overwrite the oldest waveform record when they are
triggered. The exact number and duration of waveform records, for any particular relay model, is available from the
Relay Settings section of this Manual in the Data Storage Menu listing.
Up to 500 time tagged event records are stored within the relay. New events automatically overwrite the oldest event
record when the 500 are used up.

3.13 Communications

IEC 60870-5-103 communications is standard on Reyrolle Modular II numerical product range. IEC 60870-5-103 has
the advantage of built in time synchronisation of all devices, reduced communications overhead, high data security
and compatibility with all of the major substation automation and control systems.
COM1 is a dedicated rear fibre optic serial port. COM2 can be auto-switched between rear fibre optic serial port and
a front isolated RS232 serial port. IEC 60870-5-103 may be directed to use either COM1 or COM2.
All fibre optic ports can be star connected to a Sigma passive hub or simply daisy-chained in a loop-in loop-out
configuration with other Reyrolle relays e.g. Argus, Delta, Ohmega, Tau. Up to 254 relays maybe connected to a
Sigma network server to provide relay access over an Ethernet local area network (LAN).
©2011 Siemens Protection Devices Limited
E8
E12
E16
MSCDN – MP2A Performance Specification
8k2 ± 5% ; (6.0W)
< ±1% or ±10ms
Instantaneous
< +1% or +10ms
Number of LEDs
16 General + Protection Healthy
32 General + Protection Healthy
32 General + Protection Healthy
Chapter 2 Page 7 of 13