7.56
SEL-751 Relay Instruction Manual Date Code 20170927
Communications
Communications Protocols
Individual overrides are cleared using the TEST DB command with the OFF
parameter:
Entering TEST DB A OFF clears all analog overrides and TEST DB D OFF
clears all digital overrides. Entering TEST DB OFF without any parameters
clears all overrides. When there are no overrides, the relay automatically exits
the Test Mode and clears all overrides if no TEST DB commands are entered
for 30 minutes.
THE Command (Preload or Reset Thermal Data)
The THE command allows the user to enter a starting thermal capacity or to
reset the thermal capacity for the IEC thermal elements, depending on the
included input parameters (see Table 7.51).
TIME Command (View/Change Time)
The TIME command (see Table 7.52) returns information about the SEL-751
internal clock. You can also set the clock if you specify hours and minutes
(seconds data are optional). Separate the hours, minutes, and seconds with
colons, semicolons, spaces, commas, or slashes.
=>>TEST DB <Enter>
SEL-751 Date: 02/02/09 Time: 16:24:38.764
FEEDER RELAY Time Source: Internal
NAME OVERRIDE VALUE
IA_MAG 100.0000
FREQ 60.0000
=>>
=>>TEST DB D or A name OFF <Enter>
Table 7.51 THE Command (Preload or Reset Thermal Capacity)
Command Description Access Level
THE P Preloads the thermal capacity used for the thermal ele-
ment (see Figure 7.32)
2
THE R Resets the thermal capacity used for the thermal element 2
=>>THE P <Enter>
Load preset thermal level for the 49 thermal element:
Element 1 = <THRL1>?.34
Element 2 = <THRL2>?.23
Element 3 = <THRL3>?.67
Thermal Level Value Preloaded
=>>
Figure 7.32 THE Command Example
Table 7.52 TIME Command (View/Change Time)
Command Description Access Level
TIME Displays the present internal clock time. 1
TIME hh Sets the internal clock to hh.1
TIME hh:mm Sets the internal clock to hh:mm.1
TIME hh:mm:ss Sets the internal clock to hh:mm:ss.1
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