8
S8M Operations and Operating Modes Section 1-2
Normal Power-ON
Procedure
If the S8M has been turned ON already, it will enter Run Mode or Test Mode
the next time that power is turned ON. If the S8M was in Test Mode when the
power went OFF, it will start in Test Mode. If it was in a mode other than Test
Mode when the power went OFF, it will start in Run Mode.
In addition to selecting the operating mode, the Mode Selection Menu can be
used to select the protection level (see note 1) and initialize the parameters
(see note 2).
Note (1) The Protection Level function can restrict parameter read/write access to
one of three levels. For details, refer to 4-4 Changing the Protection Level.
(2) The Initialize Parameters function restores all of the S8M's parameter set-
tings to their default values. For details on default values, refer to 4-2 Pa-
rameter Setting Ranges.
Automatic Operation
after Power ON
When a 24 VDC power supply is connected to the input terminal block, the
S8M performs self-diagnostics. If no errors are detected, the S8M immedi-
ately starts connecting the branch outputs.
Branch outputs will not be connected (ON) if they were not set to ON in Test
Mode. Furthermore, if the startup sequence function (see 2-5 Startup
Sequence Function) has been set, the outputs will be connected in order
according to their corresponding set times.
Operation in Run
Mode
In Run Mode, the S8M continuously converts the input voltage, current, run
time, and
internal temperature from analog to digital and compares these
present values to the set values (both user-set parameters and system set
values). These values can be read on the S8M's seven-segment display and
the displayed value can be switched with the Up Key ( ) and Down Key ( ).
Tripping Operation When the voltage or current is abnormal, the branch output is cut off and the
Tripping Alarm Output (TRP) is turned OFF.
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Power ON
S8M was not
in Test Mode
when power
went OFF.
Run Mode
Setting Mode
Press for 3 s
Press for 3 s
Press for 3 s
Mode Selection Menu
Select Run Mode run (RUN)
Select Setting Mode set (SET)
Select Test Mode tst (TST)
S8M was in
Test Mode
when power
went OFF.
Select Protection Level prt (PRT)
Initialize Parameters ini (INI)
Test Mode
Test Mode cannot be
selected in protection
level 2.
The Initialize Parameters
command is displayed in
protection level 0 only.
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