H3Y
Safety Precautions
Refer to Safety Precautions for All Timers.
Warning Indications
Meaning of Product Safety Symbols
Risk of fire and explosion due to arcing and rela y heat
generation that accompanies s witching. Do not use in an
environment where flammabl e or explosiv e gas is present.
The service life of the output relay varies widely
depending on switching capacity and switching
conditions. Use only within the rated load and
electrical life count, based on actual conditions of use.
Risk of contact sticking and burning if used past the
service life. Always use a load current that does not
ex ceed the rating, and if a heater is used, use a thermal switch in the
load circuit.
Do not remove the outer casing.
In rare circumstances there is a risk of slight electrical
shock, fire, or device damage. Do not disassemble,
modify, repair, or otherwise touch the inside.
Tighten the screws for the lead wires to the Socket to
the following torque.
PYF Socket: 0.78 to 1.18 N·m
This is the recommended range when crimp terminals
are used.
If the screws are not tightened sufficiently on Front-
connecting Sockets, the lead wires may come off, connection failure
may cause abnormal heating, or fires may occur.
If they are tightened excessively, the screw threads may be
damaged.
Confirm that the setting dial, indicators and plastic parts are
operating normally. Depending on the operating environment, the
setting dial, indicators and plastic parts may deteriorate faster than
expected, causing the indicators to fail. Periodically perform
inspections and replacements.
We recommend that y ou use a surge absorber if surge v oltages may occur.
When you dispose of the Timer, do so according to all local
ordinances for processing industrial waste.
When selecting a control output, use the H3Y-2 for switching ON and
OFF the power and the H3Y-4 for switching ON and OFF the minute
load.
The operating voltage will increase when using the H3Y in any place
where the ambient temperature is more than 50°C. Supply 90% to
110% of the rated voltages (at 12 VDC: 95% to 110%) when
operating at 45°C or higher.
Do not leave the H3Y in time-up condition for a long period of time
(for example, more than one month in any place where the ambient
temperature is high), otherwise the internal parts (aluminum
electrolytic capacitor) may become damaged. Therefore, the use of
the H3Y with a relay as shown in the following circuit diagram is
recommended to extend the service life of the H3Y.
Do not connect the H3Y as shown in the following circuit diagram on
the right hand side, otherwise the H3Y’s internal contacts different
from each other in polarity may become short-circuited.
Use the following safety circuit when building a self-holding or self-
resetting circuit with the H3Y and an auxiliary relay, such as an MY
Relay, in combination.
Do not use the H3Y in places where there is excessive dust,
corrosive gas, or direct sunlight.
Do not mount more than one H3Y closely together, otherwise the
internal parts may become damaged. Make sure that there is a
space of 5 mm or more between an y H3Y Models next to each other
to allow heat radiation.
The internal parts may become damaged if a supply voltage other
than the rated ones is imposed on the H3Y. When more than 100 V is
applied to 12- or 24-VDC models, the internal element (varistor) may
break.
Always use the same type of wire.
Installation
There are no restrictions on the installation orientation. Install the
Timer securely.
CAUTION Indicates a potentially hazardous situation
which, if not avoided, may result in minor
or moderate injury or in property damage.
Precautions for
Safe Use Supplementary comments on what to do
or avoid doing, to use the product safely.
Precautions for
Correct Use
Supplementary comments on what to do
or avoid doing, to prevent failure to
operate, malfunction or undesirable effect
on product performance.
Used for general prohibitions for which there is no
specific symbol.
Use to indicate prohibitions when there is a risk of
minor injury from electrical shock or other source if
the product is disassembled.
Used for general mandatory action precautions for
which there is no specified symbol.
CAUTION
Precautions for Safe Use
Precautions for Correct Use
Auxiliary relay such as MY Relay
L
2
L
1
L
2
L
1
Correct Incorrect
: H3Y
Auxiliary relay:
MY Relay