| |
| |
| JEL |
|
| Considerations on Use of SSR |
|
| |
 1.Input: |
|
In
case of unstable input voltage, please adjust
the input voltage within the range of upper and
lower level of input voltage range when circuit
on. Also please adjust the input voltage below
dropout voltage VD when circuit off.
In case of noise invading in input line, miss
operating may happen. In that case, please shorten
cables of input line and shield from high voltage/current
line. Twist cable and shield cable on input line
are also effective.
There are two kinds of input circuit which voltage
control and current control depending SSR models. |
| 2.Output: |
|
2-1.
Over-Voltage:
In case the voltage over peak repetitive off state
voltage VDRM applied to output circuit, not only
miss operating but also damage of elements inside
SSR may happen. (VDRM rating is on sudden over-voltage,
not applicable for continuous over-voltage.) Also
pay attention to instantaneous over-voltage.
If the above over-voltage caused by contact spark
of switch, voltage changes, noise invading, back-
electromotive force of inductive load, etc. on
output line would be afraid, it is recommend for
putting the over-voltage protection elements such
as a varistor between output terminals in parallel.
(The model with a built-in varistor is an exception.)
Please pay attention to the varistor rating to
avoid the damage caused by high voltage/current.
For the sudden over-voltage at starting, please
use the elements of high speed and over-voltage
protection type.
Recommended varistor voltage ratings :
220-270V (AC100V line), 430-470V (AC200V line)
As for the large value of off state dV/dt on power
supply side and commutation dV/dt by inductive
load may cause of miss operating or non-stopping,
please confirm the operating conditions carefully.
As measures, adjusting snubber constant or replacement
to larger current capacity SSR are effective.
2-2. Over Current:
If the current is over surge current rating ISURGE
in output circuit, the damage of elements inside
SSR may happen. To protect inside elements, please
use a fuse. (ISURGE ratings of SSR are showing
outstanding against sudden over-current. Not applicable
for repetitive over-current.)
In case that it is afraid for the sudden large
current applied by short circuit or others, please
provide the protection for over-current by using
of a high-speed fuse with the meltdown characteristics
IFF working under load IR and ISURGE ratings,
in series at output circuit.
Depending on load, 10-40 times of load ratings
at starting may happen. When selecting SSR, please
take the inrush instant current and its duration
into consideration carefully.
In case the instant current is over 1 cycle surge
current, there is a way to protect SSR from the
above by putting serial protection resistance
RS or serial protection inductance LS in series
at load.
 |
| 3.Radiation Design: |
|
As
requiring radiation, please use SSR within the
range of load current characteristics curve.
Please use SSR on the best radiation conditions
by taking the power supply voltage duration and
environmental temperature rising into consideration.
In case of using it in the closed area and number
of SSR in adjacency, please make sure to have
much enough radiation design taking air flow and
heat interference between each SSR into consideration.
As for models needed heat-sink, please use JEL
standard heat-sink showing in load current characteristic
curve, and also use silicon grease and take care
not to stick dust, and keep the surface of radiation
equipment flat and without any flash in order
to keep radiation effect. When use the other heat
sink besides our products, please ask us the radiation
conditions.
As operating SSR produces high temperature, please
do not touch SSR itself and heat sink. |
| 4.Loads: |
|
4-1.
Small Current Loads:
Small current or high sensitive loads give some
troubles such as no SW OFF even by cut off input
voltage or also by off state leakage current during
open circuit of SSR. In that case please adjust
the level not to keep SW ON by shunt resistance
RP in parallel to the load in order to reduce
the off state leakage current through the load.
Resistance RP is calculated by the following formula.
An approximate above value is the same value as
load resistance RL.
4-2. Inductive Loads:
In case of applying magnet relay, motor, solenoid,
and solenoid valve with high inductivity, the
over voltage protection elements such as varistor
are very effective for avoiding the damage of
elements inside SSR and the miss-operation caused
by over voltage produced by back-electromotive
force when load off. Since the inductive load
produces very big inrush current, please select
the SSR capable for various current.
In case of selecting SSR with zero-cross circuit
on the load having big phase difference of voltage/current,
please take care of the miss-operation when over
40V/200 μ sec of the rate of rise of load
voltage at commutation.
4-3. Capacitive Loads:
The load with capacitance such as motor with capacitance
and switching power supply may cause over current
of charge/discharge current or voltage by adding
power supply voltage and charging voltage to capacitor.
Please make sure to have an over current/voltage
measure in output side.
For the above, please mount varistor for over
voltage and serial resistance for over current.
4-4. Particular Loads and Applications:
Particular load conditions or ambient which is
not suitable for SSR may cause unstable operation
of SSR. Please use SSR carefully by checking the
operating conditions in advance. Especially, since
the load which is below load current of SSR minimum
operating current or no sign wave of operating
current and self-oscillating load may cause unstable
operation, please check the operating conditions
and voltage/current wave carefully. |
| 5.Others: |
|
Not
available to use SSR in series to obtain more
voltage rating and also in parallel to obtain
more current capacity. Please use SSR with enough
capacity for the above.
When mounting SSR in circuit, please take care
to avoid stress by heat during soldering. This
also may cause luck of reliability. Soldering
temperature condition should be 250 5 within 10 seconds in using terminal mounting SSR.
In case of SSR for mounting on PCB, please do
not give stress on SSR itself when forming to
the lead terminals.
Torque requirement is within 20kgf•cm(1.96N•m)
on M5 screw, 15kgf•cm(1.47N•m) on M4 screw
and 8kgf•cm(0.78N•m) on M3 screw. Please
take a suitable and perfect method of SSR when
mounting it to electric pole terminals. Imperfect
mounting may cause unusual heat and also firing
when operating. Also please mount SSR on the heat
sink in perfect manner in order to avoid insufficient
radiation.
The maximum torque range of screwing SSR on heat-sink
is within 24kgf•cm(2.35N•m) on M5 screw,
15kgf•cm(1.47N•m) on M4 screw and 8kgf•cm(0.78N•m)
on M3 screw.
When cleaning SSR, please take care not to use
cleaning agent that may cause damage of resin
case.
SSR is not having a recovery function from the
damage. If requiring very high reliability, please
take care of using various protection methods
on SSR and also in system.
Please do not use our SSR near by fire, heater
and inflammables even our SSR body is made of
noninflammable resin.
Please make sure to get ground with radiation
part (Al-base) of SSR in case of SSR with radiator.
Please take care not to get electrical shock.
If drop SSR down when handling, please use it
after confirming of its characteristics. Please
do not make SSR wet and take care of not to put
agents and steam which may cause damage on resin.
Also take care not to have dew. Please do not
use SSR in ambient area such as agent evaporation,
or give any strong shock and vibration on it.
When disposing SSR itself, accessories or packing
materials, please make sure to keep environmental
standards and do it in good manner.
Please feel free to contact our sales section
or technical division of factory if you have any
questions. |
|
|
|
