A sub-menu is opened by pressing the
within the sub-menu can then be viewed in turn. Leaving a sub-menu, by scrolling either upwards or
downwards, causes it to be automatically closed. It must be re-opened in order to view its settings again.
scrolls up / down, viewing the screens. All screens can be viewed even if the
password is not known - the password only protects the relay against unauthorised changes.
While viewing an editable screen, ENTER allows the user to change the displayed data, indicated by
flashing character, as long as the changes are authorised via password verification. Pressing
increments / decrements that particular character, while
are held pressed while scrolling through a range of numerical settings then the rate of scrolling
CANCEL returns the screen to view mode and restores the most recently stored setting.
If changes are made, pressing ENTER alters the values on that screen and immediately stores
changes into non-volatile memory. This also returns the screen to view mode
move to the previous / next screen.
There are eight separate 'Settings Groups. The different settings groups can be viewed or edited
independently and indication of which group is presently being viewed is given by the 'G?' character in the
top left of the display.
The setting selections, setting ranges and default values can be found at the end of each relevant section in
the technical manual.
13 Relay Hardware
The range of relays are housed in the Epsilon case - size 16.
The relay hardware is illustrated in 1.
The build consists of up to eight internal hardware modules as well as the fascia module. All relay models
are supplied with the following modules:
Modules B, C and D are optional giving additional input/output capability.
The fascia PCB includes the human machine interface (HMI), with pushbuttons for entering settings, an LCD
for displaying alphanumeric and optionally graphical information and LEDs for indication. A 25 pin RS232 D
type connector is located on the front plate to allow local data communications.
Current and voltage input signals are carried from the input modules via the data acquisition bus (DAQ) to
the analogue input processor card for processing. The processed inputs are in turn carried to the protection
processor/controller module via the expanded I/O bus.
Two remote data communications interfaces - fibre optic - and an IRIG-B connector are located behind
module H and connected into the controller card.
A 34 way ribbon cable connects the I/O and fascia modules to the processing and protection processor
/controller modules and a 26 way ribbon cable connects the analogue modules to their processor and
another 26 way ribbon cable connects the processors together.
©2011 Siemens Protection Devices Limited
key when viewing one of the above title screens. The settings
Power supply + basic I/O
Analogue input processing
Protection processor and controller
7SG164 Ohmega 400 Series Description of Operation
moves right along the edit field or fields. If
Chapter 1 Page 10 of 12