xv
■ Startup Delay
To prevent cutoffs caused by large surge currents when the equipment starts, the S8M has a startup delay that
disables the tripping operation for 70 ms after the semiconductor relay turns ON.
• The startup delay will not operate when a relay or other device is used for ON/OFF control on the output side
of the S8M, so a tripping operation may occasionally occur.
■ Withstand Voltage Test
The S8M is designed to withstand 500 VAC for 1 minute between the power input terminals and all branch
output terminals, between all signal output terminals and all external tripping input terminals, between all
signal output terminals and all communications terminals, and between all external tripping input terminals and
all communications terminals.
Note
• The S8M may possibly be damaged from the impulse voltage if a testing device switch is used to
abruptly apply or shut off 500 VAC. Increase the applied voltage gradually using the voltage
adjustment on the testing device.
• Always short the specified terminals so that the voltage is applied to all of the terminals at the same
time.
• The power input terminals and branch output terminals are not isolated. Do not perform dielectric
strength tests between the input and output terminals.
■ Voltage Display
The voltage detection function monitors the voltage at the power input terminals. Measure the voltage at the
branch outputs to confirm that the output voltage is correct.
■ Series Connections
An S8M cannot be connected in series to another S8M’s output and branch outputs cannot be connected in
series.
• Do not connect S8Ms in series.
• Do not connect S8M branch outputs in series.
AC/DC
power supply
+
−
+
−
S8M S8M
Incorrect
Incorrect
+
−
+
−
+
−
+
−
S8M
S8M
S8M
+
+
−
−
AC/DC
power supply
AC/DC
power supply
Incorrect
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