Omron S8AS, User Manual

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8
S8AS Operating Modes
Section 1-2
Turning the Power ON for
the First Time • When a newly purchased S8AS is turned ON for the first time, it will enter
Run Mode with all the branch outputs turned ON. To change parameter
settings, return to the Mode Selection Menu and switch to Setting Mode.
Refer to
SECTION 4 Parameter Settings for details on setting parameters.
• To start trial operation or to set branch output connections after setting the
parameters, return to the Mode Selection Menu and switch to Test Mode.
Refer to
SECTION 5 Trial Operation to Actual Operation for details on the
operations in Test Mode.
• When changing to Run Mode after completing trial operation, return to the
Mode Selection Menu and switch to Run Mode. If the power is turned
OFF while the S8AS is in Test Mode, the S8AS will enter Test Mode again
the next time that the power is turned ON. All branch outputs will retain
the connection status they had before the power was turned OFF.
Normal Power-ON
Procedure If the S8AS has been turned ON already, it will enter Run Mode or Test Mode
the next time that power is turned ON. If the S8AS 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 and initialize the parameters (see note 2).
(These options cannot be selected when using the S8AS-24006N/48008N.)
The Initialize Parameters function restores all of the S8AS's parameter set-
tings to their default values. For details on default values, refer to
Turning the
Power ON for the First Time .
Automatic Operation
after Power ON
When the rated voltage (100 to 240 VAC, 50/60 Hz) is applied to the AC input
terminal block, the S8AS performs self-diagnostics (hardware and software
checks) for approximately 3 seconds. (“AS” will flash on the seven-segment
display during the self-diagnostic process.) If no errors are detected, the
S8AS will immediately start connecting the branch outputs.
Branch outputs will not be connected if they were not set to ON in Test Mode.
Furthermore, if the startup sequence function (refer to
2-5 Startup Sequence
Function ) has been set, the branch outputs will be connected according to
their corresponding settings.
Operation in Run
Mode
In Run Mode, the S8AS continuously measures the output voltage, branch
output circuit currents, and internal temperature, and compares these values
to the set values (both user-set parameters and system set values).
Monitor Operation The monitored output voltage, branch output currents, branch output peak
current, total current, internal temperature, and replacement time can be read
on the S8AS's seven-segment display. The displayed value can be switched
with the Up (SEL) Key (
U
) and Down (CH) Key (
D
).
Tripping Operation If the voltage or current is abnormal, the branch output will be cut off to protect
the circuit.
■
Abnormal Voltage Tripping
All branch outputs will be cut off if the output voltage exceeds 28.8 VDC in
order to protect the load devices.
■
Abnormal Current Tripping
A branch output will be cut off if the tripping current threshold (see note) or an
abnormal current is detected using the specified current detection method
(see note). (The tripping current threshold and current detection method can-
not be changed for the S8AS-24006N/48008N.)