S8AS Datasheet, PDF (25/26 Pages) Omron Electronics LLC – Smart Power Supply

S8AS
Insulation Resistance Test
• When testing the insulation resistance, use a DC resistance meter
at 500 VDC.
• To prevent damage, always short branch output terminals (+/−), all
I/O terminals, and communications terminals before testing.
Output Voltage Adjustment
• If the output voltage is set to less than 20 V (default setting), the
undervoltage alarm may be activated.
• Do not exceed the rated output capacity and rated total output
current after adjusting the output voltage.
• The output voltage may increase beyond the allowable voltage
range rated voltage +10% when the V.ADJ adjuster is used. When
adjusting the output voltage, check the output voltage of the power
supply to make sure that the load is not damaged.
Displaying the Output Voltage
The voltage detection is performed on the voltage after AC/DC
conversion in the interval circuits. The displayed voltage will be
somewhat different from the value at the output terminals of the power
source due to internal voltage drop. To confirm correct output
voltages, measure the voltages at the branch output terminals.
No Output Voltage
The internal circuit's overcurrent protection or overvoltage protection
may operate. Alternatively, the latch protection circuit may operate if
there is a lightning inrush or other large voltage applied to the input.
Contact your OMRON representative if there is still no output voltage
after checking the following two points:
• Checking Overcurrent Protection
Check whether the load is in an overcurrent or short-circuited state.
Remove the wires to the load before checking.
• Checking Overvoltage Protection and Latching Protection
Turn the power supply OFF and leave it OFF for at least 3 minutes,
then turn it ON again.
Startup Time
At startup, the S8AS will check hardware and software before starting
the operation of branch outputs. A time of approximately 3 seconds is
required for these self-diagnostic functions. Take this time into
account when designing the system.
External Tripping Input
• Wire the polarity of the external tripping input correctly.
• After completing wiring, confirm that operation is correct.
Tripping Alarm Output,
Undervoltage Detection Output, Maintenance
Forecast Monitor Output,
and Over-temperature Output
Photoswitch outputs: 30 VDC max., 50 mA max., residual voltage
when ON: 2 V max., leakage current when OFF: 0.1 mA max.
• Wire all output signal circuits correctly.
• Internal current control circuits are not provided internally for output
signals. Do not allow the output current to exceed 50 mA.
• After completing wiring, confirm that the circuits operate correctly.
Prohibition of Parallel Connection
Do not connect branch outputs from the S8AS in parallel. Also, do not
connect the branch outputs in parallel with branch outputs of other
S8AS Power Supplies.
S8AS
S8AS
S8AS
Connections cannot be made in parallel
with other branch output circuits.
Connecting Backup Devices
Do not connect a battery or other backup power supply to the output
of the Product.
Harmonic Current Suppression Circuit
A harmonic current suppression circuit is built into the Power Supply.
This circuit can create noise when the input is turned ON, but it will
last only until the internal circuits stabilize and does not indicate any
problem in the Product.
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