Solid State Relays (Single-phase)
G3PB
7
Please reduce the ambient temperature of SSRs.
The rated load current of an SSR is measured at an ambient
temperature of 25
°
C or 40
°
C.
An SSR uses a semiconductor in the output element. This causes
the temperature inside the control panel to increase due to heating
resulting from the passage of electrical current through the load. To
restrict heating, attach a fan to the ventilation outlet or air inlet of the
control panel to ventilate the panel. This will reduce the ambient
temperature of the SSRs and thus increase reliability. (Generally,
each 10
°
C reduction in temperature will double the expected life.)
Example: For 10 SSRs with load currents of 15 A,
0.23 × 10 = 2.3
Thus, 3 fans would be required.
Size of fans: 92 mm
2
, Air volume: 0.7 m
3
/min,
Ambient temperature of control panel: 30
°
C
If there are other instruments that generate heat in the control
panel other than SSRs, additional ventilation will be required.
Operating Conditions
•
Do not apply currents exceeding the rated current otherwise, the
temperature of the G3PB may rise excessively.
•
Be sure to install protective devices on the power supply side, such
as fuses and non-fuse breakers, as protection against accidents
due to short-circuiting.
•
Do not apply overvoltages to input or output circuits.
Doing so may cause Relay failure or burning.
EMC Directive Compliance
The G3PB complies with EMC Directives when capacitors and
varistors are used, as shown in the following diagram.
•
The capacitor C1 must be connected between the input terminals
for G3PBs with DC inputs.
•
The capacitor C2 must be connected to the load power supply
outputs.
•
C1 and C2 must not be electrolytic capacitors.
•
The varistor must be connected between the output terminals of
the G3PB.
•
The input cable must be no longer than 3 m.
Loss Time
If the load power supply is used under a low voltage or current, the
loss time will increase. Before operating the G3PB, make sure that
this loss time will not cause problems.
Precautions on Operating and Storage Environments
1. Operating Ambient Temperature
The rated value for the ambient operating temperature of the G3PB
is for when there is no heat build-up. For this reason, under
conditions where heat dissipation is not good due to poor ventilation,
and where heat may build up easily, the actual temperature of the
G3PB may exceed the rated value resulting in malfunction or
burning.
When using the G3PB, design the system to allow heat dissipation
sufficient to stay below the Load Current vs. Ambient Temperature
characteristic curve. Note also that the ambient temperature of the
G3PB may increase as a result of environmental conditions (e.g.,
climate or air-conditioning) and operating conditions (e.g., mounting
in an airtight panel).
2. Transportation
Do not drop the G3PB or subject the G3PB to abnormal vibration or
shock during transport and installation. Doing so may result in
malfunction, failure, or deterioration of performance characteristics.
3. Vibration and Shock
Do not subject the G3PB to excessive vibration or shock. Otherwise
the SSR may malfunction and internal components may be
damaged.
To prevent the G3PB 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.
4. Solvents
Do not allow the G3PB to come in contact with solvents, such as
thinners or gasoline. Doing so will dissolve the markings on the
G3PB.
5. 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.
Operation
1. Leakage Current
A leakage current flows through a snubber circuit in the G3PB even
when there is no power input. Therefore, always turn OFF the power
to the input or load and check that it is safe before replacing or wiring
the G3PB.
2. Screw Tightening Torque
Tighten the G3PB terminal screws to the rated torque. If the screws
are not tightened sufficiently, the G3PB may be damaged by heat
generated when the power is ON.
3. Installation
Do not install the G3PB using hands that are dirty with oil or metal
dust. Doing so may result in a malfunction.
4. Do Not Drop
Be careful not to drop the product during installation, mounting, or
otherwise handling the G3PB.
Load current (A)
15 A
25 A
35 A
45 A
Required number of fans
per SSR
0.23
0.39
0.54
0.70
Output
C1
C2
Input
G3PB
Load
3 m max.
Capacitor C1
0.1 µF
Capacitor C2
0.5 µF, 500 VAC
Varistor
910 V, 0.6 W
Loss time
Input circuit
T
rigger circuit
Switch element
Snubber circuit
Leakage
current
V
a
ristor
