G3H203SNDC524 Datasheet, PDF (8/12 Pages) Omron Electronics LLC – Solid State Relays Technical Information

I Safety Considerations
Error Mode
The SSR is an optimum relay for high-frequency switching and high-
speed switching, but misuse or mishandling of the SSR may damage
the elements and cause other problems. The SSR consists of semi-
conductor elements, and will break down if these elements are dam-
aged by surge voltage or overcurrent. Most faults associated with the
elements are short-circuit malfunctions, whereby the load cannot be
turned OFF.
Therefore, to provide a safety feature for a control circuit using an
SSR, design a circuit in which a contactor or circuit breaker on the
load power supply side will turn OFF the load when the SSR causes
an error. Do not design a circuit that turns OFF the load power supply
only with the SSR. For example, if the SSR causes a half-wave error
in a circuit in which an AC motor is connected as a load, DC energiz-
ing may cause overcurrent to flow through the motor, thus burning
the motor. To prevent this from occurring, design a circuit in which a
circuit breaker stops overcurrent to the motor.
Location
Input area
Output area
Whole Unit
Cause
Result
Overvoltage
Input element damage
Overvoltage
Output element damage
Overcurrent
Ambient temperature Output element damage
exceeding maximum
Poor heat radiation
SSR Mounting Panel Quality
If G3NA or G3NE SSRs are to be mounted directly onto the control
panel, without the use of a heat sink, be sure to use a panel material
with low thermal resistance, such as aluminum or steel. Do not
mount the SSR on a panel with high thermal resistance, such as a
panel coated with paint. Doing so will decrease the radiation effi-
ciency of the SSR, causing heat damage to the SSR output element.
Do not mount the SSR on a panel made of wood or any other flam-
mable material. Otherwise the heat generated by the SSR will cause
the wood to carbonize, and may cause a fire.
Overcurrent Protection
A short-circuit current or an overcurrent flowing through the load of
the SSR will damage the output element of the SSR. Connect a
quick-break fuse in series with the load as a short-circuit protection
measure.
Design a circuit so that the protection coordination conditions for the
quick-break fuse satisfy the relationship between the SSR surge
resistance (I_S), quick-break fuse current-limiting feature (I_F), and the
load inrush current (I_L), shown in the following chart.
Time (unit: s)
Operation Indicator
The operation indicator turns ON when current flows through the
input circuit. It does not indicate that the output element is ON.
I SSR Life Expectancy
The SSR is not subject to mechanical wear. Therefore, the endur-
ance of the SSR depends on the rate of internal component malfunc-
tion. For example, the rate for the G3M-202P is 321 Fit
(1 Fit = 10^−9 = λ (malfunctions/operation)). The MTTF calculated from
this value is as follows:
MTTF = 321/λ₆₀ = 3.12 × 10⁶ (operations)
The effects of heat on the solder also need to be considered in esti-
mating the total life expectancy of the SSR. The solder deteriorates
due to heat-stress from a number of causes. OMRON estimates that
the SSR begins to malfunction due to solder deterioration approxi-
mately 10 years after it is first installed.
I Operation and Storage
Environment Precautions
Operation and Storage Locations
Do not operate or store the Relay in locations subject to direct sun-
light or ultraviolet rays. Otherwise the resin will deteriorate, thereby
causing cracks and other damage to the case. Do not operate or
store the Relay in locations subject to exposure to water or chemi-
cals. Otherwise rust, corrosion, and deterioration of the resin will
occur.
Extended Storage of SSR
If the SSR is stored for an extended period of time, the terminals will
be exposed to the air, reducing its solderability due to such effects as
oxidation. Therefore, when installing a Relay onto a board after a
long time in storage, check the state of the solder before use. Also,
take preventive measures so that the terminals will not be exposed to
water, oil, or solvents while they are stored.
Vibration and Shock
Do not subject the SSR to excessive vibration or shock. Otherwise
the SSR will malfunction and may cause damage to the internal com-
ponents.
To prevent the SSR from abnormal vibration, do not install the SSR in
locations or by means that will subject it to vibration from other
devices, such as motors.
Solvents
Do not allow the SSR to come in contact with solvents such as thin-
ners or gasoline. Doing so will dissolve the markings on the SSR.
Oil
Do not allow the SSR terminal cover to come in contact with oil.
Doing so will cause the cover to crack and become cloudy.
Solid State Relays Technical Information
835