Startup Delay - Omron S8AS User Manual

3. Do not allow a peak current to flow again for at least 60 seconds after a peak current has exceeded the rated
current.

■ Startup Delay

The S8AS has a startup delay function that prevents cutoffs caused by inrush current at startup.
The startup delay disables the cutoff operation for 40 ms after the semiconductor relay turns ON.
To protect internal circuits, however, the relevant branch outputs will be cut off even during the startup delay
period if a current limit is exceeded within a specific time period.
Note The startup delay will not operate when a relay or other device is used for ON/OFF control on the output
side of the S8AS, so a cutoff operation may occasionally occur.
■ Dielectric Strength Test
The S8AS is designed to withstand 3,000 VAC for 1 minute between the AC input terminals collectively and
the branch output, I/O signal, or communications terminals collectively. When testing, set the cutoff current for
the withstand voltage test device to 20 mA.
Note
1. The S8AS may possibly be damaged from the impulse voltage if a testing device switch is used to abruptly
apply or cut off 3000 VAC. Increase the applied voltage gradually using the voltage adjustment on the testing
device.
2. When testing terminals together, always short the specified terminals so that the voltage is applied to all of
the terminals at the same time.
■ Insulation Resistance Test
When testing the insulation resistance, use a DC resistance meter at 500 VDC.
Note To prevent damage, always short branch output terminals (+/–), all I/O terminals, and communications
terminals before testing.
■ Output Voltage Adjustment
Default setting: Set as the rated voltage.
Adjustable range: Adjustable from –10% to +10% of the rated output voltage by using the V.ADJ. adjuster on
the front or the Power Supply. Turning the adjuster clockwise increases the output voltage, and turning it
counterclockwise decreases the output voltage.
Note
1. If the output voltage is set to less than 20 V (default setting), the undervoltage detection may be activated.
2. Do not exceed the rated output capacity and rated total output current after adjusting the output voltage.
3. 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.
■ 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 surge 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.
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