Omron H3CR-A Manual page 307

H3BG
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Caution
Power Supply Connection
If the Timer is connected to an AC power supply, its two-pole ter-
minals can be connected to the power supply in either direction,
regardless of the polarity. But if it is connected to a DC power
supply, be sure to connect the Timer's power terminals to the
correct polarities.
Use sine wave for the waveform of an AC power supply. Use a
DC power supply having a ripple factor of 20% or less and sup-
plying a mean voltage that is within the rated operating voltage
range of the Timer.
Make sure that the supply voltage is applied to the Timer all at
once, using contacts such as of a switch or relay. If the supply
voltage is applied gradually, the Timer may not be able to per-
form power reset or its set time may be up when it should not.
Power Source Connection
Because the AC-operated version is a capacitive load, the solid-
state relay to be used must be rated at a dielectric strength two
times that of the Timer to switch the power source of the Timer.
ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.
To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.
Cat. No. L31-E1-7
H3BG
307