5
F. Changing MNPR™ Settings
In addition to the preset modes located on the top row of the programmer, the
user can use the Programmer to manually change the settings of an individual
MNPR™. Press
D, 2
to select
RELAY ACTUAL
. Use
NEXT
to scroll through
the MNPR™ variables then use
INC
and
DEC
to change the setting to the
desired values.
When finished, press
ENTER
to download the new settings to the MNPR™. The
MNPR™ will display
“Remote Login”
and then four dots to indicate that it has
been programmed. The present MNPR™ mode will appear on the MNPR™
scrolling display. When ENTER is pressed, the Programmer will display
“Programming Westinghouse”
or
“Programming General Electric”
depending on
the type of MNPR™ it is programming.
NOTE: Failure to press ENTER may not download the new settings. This
depends on whether download mode is on or off.
Note: If you press RELAY ACTUAL and nothing happens, your programmer
may be set with the Actual Mode turned off.
Note: Using Relay Actual to program the MNPR™ settings will not change
the programmer’s stored settings.
If the relay is set to operate in Sensitive (standard) mode, the user can program
three different values.
1. Reclose Voltage
- This value sets the minimum three phase average
differential voltage necessary to close the protector.
Note: The Reclose Voltage sets the minimum closing voltage at 10
degrees phase angle.
2. Reclose Angle
- This value specifies the lower limit of the reclose region.
The protector will not close if the phase angle is below this value regardless
of the magnitude of the differential voltage.
3. Sensitive Trip Current
- This value tells the MNPR™ the minimum reverse
current necessary to open the protector. Depending on the setup of the
Programmer, this value can be displayed as milliamperes into the MNPR™ or
amperes into the protector. (e.g. 7.5 milliamperes through the MNPR™ is the
same as 2.4 amperes through the network protector bus on a 1600 Amp
Network Protector).
