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S8M Operating Procedure Section 1-4
Summary of Application Objectives and Settings
Desired objective/
usage
Settings Details
Use as a circuit
breaker with overcur-
rent tripping.
In Setting Mode, set the tripping current value (C-V) for the branch output being
used and set the abnormal current tripping detection setting (C-T) to standard
detection (USU).
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Use as a circuit
breaker for short-cir-
cuit current protec-
tion.
In Setting Mode, set the tripping current value (C-V) for the branch output being
used and set the abnormal current tripping detection setting (C-T) to instantaneous
detection (INS).
Output an alarm
when output is cut off
due to overcurrent.
Take the alarm signal from the Tripping Alarm Output (TRP) terminal. When an out-
put is cut off, the seven-segment display will show error code A11 and the TRP out-
put will go OFF.
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Output an alarm
before output is cut
off due to overcur-
rent.
In Setting Mode, set the overcurrent alarm value (A-V) for the branch output being
used and set the overcurrent alarm detection setting (A-T) to standard detection
(USU) or instantaneous detection (INS). Take the alarm signal from the Alarm Out-
put (ALM) terminal. When an overcurrent is detected, the seven-segment display
will show error code A22 and the ALM output will go OFF.
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Detect power supply
overvoltage.
In Setting Mode, set the overvoltage alarm value (V-O). Take the alarm signal from
the Alarm Output (ALM) terminal. When an overvoltage is detected, the seven-seg-
ment display will show error code A20 and the ALM output will go OFF.
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Detect a drop in
power supply volt-
age.
In Setting Mode, set the undervoltage alarm value (V-U). Take the alarm signal
from the Alarm Output (ALM) terminal. When an overvoltage is detected, the
seven-segment display will show error code A21 and the ALM output will go OFF.
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Apply a separate
time lag when con-
necting each branch
output.
In Setting Mode, set the startup sequence (UPS). 64, 30
Apply a separate
time lag when cutting
off each branch out-
put.
In Setting Mode, set the shutdown sequence (DWS) and enable the External Trip-
ping Input (TRG).
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Perform a system
inspection after a
fixed run time.
In Setting Mode, set the desired run time (TIM). Take the alarm signal from the
Alarm Output (ALM) terminal. When the preset run time is reached, the seven-seg-
ment display will show error code A23 and the ALM output will go OFF.
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Reset the run time. In Setting Mode, select the Clear Run Time command (CLR). 71
Monitor temperature
rise in control panel
and prevent over-
heating.
In Setting Mode, set the over-temperature output value (TMP). Take the signal from
the Over-temperature Output (TMP) terminal and use that signal to operate a fan or
air conditioner.
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Restrict read/write
access of parame-
ters to prevent mis-
taken operations.
Select the protection level setting (PRT) from the Mode Selection Menu and set the
desired protection level.
54
Ensure normal oper-
ation for other
devices connected to
a power supply to
which a device with a
short-circuit is con-
nected. (Prevent
voltage drops due to
short-circuits.)
To achieve this, extra current capacity is required in the Power Supply Unit con-
nected to the S8M. Select a Power Supply Unit with a current capacity that is 10 to
12 A higher than the maximum current supply to the connected devices. Use the
total current display in Run Mode to confirm if the selected Power Supply Unit satis-
fies this condition.
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