14/1/98
Page 17
Issue H
7.4 Matrix Setting
7.4.1 Trip Relay Matrix, Tnnn
This setting, range 000 to 255, sets the faults that are to operate the trip output relay. The setting also
allows the Trip Relay to be either energised or de-energised upon activating.
A Thermal Overload trip will always operate i.e. Change the state of, the Trip Relay. To configure
the relay, a brief example is shown below:
Example
Only Overload Trip, Earth Fault Trip and Low Set Trip are required and the relay is to energise upon
tripping. Therefore the set value would be:
161
Action
Numerical
Value
Set
Y/N
Value
Earth Fault Trip
128
Y
128
High Set Trip
64
Low Set Trip
32
Y
32
NPS Trip
16
Number of Starts Trip
8
Undercurrent Trip
4
Phase Rotation
2
Relay Energises on TRIP
1
Y
1
161
By default the Trip matrix is set to 255, i.e. all trips enabled, energise on trip.
7.4.2 Programmable Relay Matrix, Pnnn
This setting, range 000 to 255, sets the faults that will cause the Programmable Relay to be energised
as well as acting upon commands from the Serial Link
Example
Only Earth Fault and Low Set are required to be acted upon, therefore the set value would be:
160
Action
Numerical
Value
Set
Y/N
Value
Earth Fault Alarm
128
Y
128
High Set Alarm
64
Low Set Alarm
32
Y
32
NPS Alarm
16
Number of Starts Alarm
8
Undercurrent Alarm
4
Phase Rotation Alarm
2
Activate Upon Serial Link
Commands
1
160
If Serial Link is selected then none of the bits have any effect. Also unlike the Trip Relay, the
Programmable Relay does not automatically pick-up for Thermal Overload.
