H3DK Datasheet, PDF (25/30 Pages) Omron Electronics LLC – Solid-state Timers

Safety Precautions
● Refer to Safety Precautions for All Timers.
Note: The following is common for all H3DK models.
Caution
Switching arcs or relay heating may cause fire or
explosion. Do not use the Timer in the presence of
inflammable or explosive gases.
The H3DK Series uses a transformerless power
supply system. An electrical shock may occur if
an input terminal is touched while power is being
supplied.
The inrush current will depend on the type of load
and may influence the contact switching fre-
quency and number of operations. Check both the
rated current and the inrush current, and allow
leeway in the circuit design.
The life of the output relay largely depends on the
switching current and other switch conditions.
Consider the actual application conditions and do
not exceed the rated load or electrical life. If the
output relay is used beyond its service life, the contacts
may fuse or burning may occur. Also, never exceed the
rated load current. When using a heater, also place a ther-
mal switch in the load circuit.
Do not remove the external case.
Minor electric shock, fire, or equipment failure
may sometimes occur. Do not disassemble, mod-
ify, or repair the Timer or touch any internal parts.
H3DK
Precautions for Safe Use
• Use ferrules to wire the H3DK. If stranded wires are used, wire
scraps may enter the Timer, possibly shorting the circuits.
• Rapid changes in temperature or high humidity may cause
condensation in Timer circuits, possibly resulting in malfunc-
tion or damage to components. Check the application environ-
ment.
• Store the Timer within the rated ranges given for the Timer
model you are using. If the Timer is stored below −20°C, allow
it to warm up for three hours at room temperature before turn-
ing ON the power supply.
• Use the Timer within the ambient operating temperature and
ambient operating humidity ranges given for the Timer model
you are using.
• Use the Time within the characteristics for water and oil expo-
sure given for the Timer model you are using.
• Do not use the Timer in locations subject to excessive dust,
corrosive gas, or direct sunlight.
• Do not use the Timer in locations subject to vibration and
shock. Long-term exposure may damage the Timer due to
stress.
• Separate the Timer from any sources of excessive static elec-
tricity, such as forming materials and pipes carrying power or
liquid materials.
• Maintain the variations in the power supply voltage to within
the specified allowable range.
• If a voltage that exceeds the rating is applied, internal compo-
nents may be destroyed.
• Wire all terminals correctly.
• Use only the specified wires for wiring.
Applicable wire gauge: AWG18 to AWG22
• Install and clearly label a switch or circuit breaker so that the
operator can quickly turn OFF the power supply.
• If the Timer is left in the timed out condition for a long period of
time at high temperatures, internal components (such as elec-
trolytic capacitors) may deteriorate quickly.
• The exterior of the Timer may be damaged by organic solvents
(such as thinners or benzene), strong alkali, or strong acids.
• For Timers with AC power input, use a commercial power sup-
ply for the power supply voltage. Although some inverters give
50/60 Hz as the output frequency, do not use an inverter out-
put as the power supply for a Timer. Doing so may result in
smoking or burning due to internal temperature increases in
the Timer.
• Use the same type of wiring for all Timer wiring.
• When disposing of the Timer, observe all local ordinances as
they apply.
• The Timer may not operate properly in locations that are sub-
ject to sulfide gas, such as in sewers or incinerators. Products
that are suitable for operation in sulfide gas are not available
for OMRON Timers or general control devices. Seal the Timer
to isolate it from sulfide gas. If the Timer cannot be sealed,
OMRON can make special products with resistance to sulfide
gas for some Timers. Ask your OMRON representative for
details.
• Confirm that the power and output indicators are operating
normally. Depending on the operating environment, the indica-
tors and plastic parts may deteriorate faster than expected,
causing the indicators to fail. Periodically perform inspections
and replacements.
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