Omron G3PJ Series Manual page 9

EMI
This is a Class A product (for industrial environments). In a domestic
environment, the G3PJ may cause radio interference, in which case
the user may be required to take appropriate measures.
Noise and Surge Effects
If noise or an electrical surge occurs that exceeds the malfunction
withstand limit for the G3PJ output circuit, the output will turn ON for
a maximum of one half cycle to absorb the noise or surge. Confirm
that turning the output ON for a half cycle will not cause a problem for
the device or system in which the G3PJ is being used prior to actual
use. The G3PJ malfunction withstand limit is shown below.
• Malfunction withstand limit (reference value): 500 V
Note: This value was measured under the following conditions.
Noise duration: 100 ns and 1 s
Repetition period: 100 Hz
Noise application time: 3 min
Mounting to Control Panel
If the panel is airtight, heat from the G3PJ will build up inside, which
may reduce the current carry ability of the G3PJ or adversely affect
other electrical devices. Be sure to install ventilation holes on the top
and bottom of the panel.
The G3PJ Mounting Pitch (Panel Mounting)
10 mm min.
The G3PJ
Mounting direction
Vertical Direction
Host and slave
80 mm min.
Duct or other object blocking airflow
Between duct and
G3PJ
60 mm min.
Between duct and
G3PJ
30 mm min.
Relationship between the G3PJ and Ducts or Other
Objects Blocking Airflow
Incorrect Example Countermeasure 1
Duct or other object
50 mm max.
blocking airflow
Duct
Vertical
Direction
The G3PJ
Duct Duct
If the depth direction of Use ducts that have a
the G3PJ is obstructed by shallow depth, to provide
ducts, the heat radiation a sufficient ventilation
will be adversely affected. area.
Ventilation Outside the Control Panel
Duct or other object blocking airflow
Be aware of airflow
The G3PJ
Air inlet
Note: 1. If the air inlet or air outlet has a filter, clean the filter regularly
to prevent it from clogging to ensure an efficient flow of air.
2. Do not locate any objects around the air inlet or air outlet,
otherwise the objects may obstruct the proper ventilation of
the control panel.
3. A heat exchanger, if used, should be located in front of the
G3PJ to ensure the efficiency of the heat exchanger.
G3PJ Ambient Temperature
The rated current of the G3PJ is measured at an ambient temperature
of 40°C.
The G3PJ uses a semiconductor to switch the load. This causes the
temperature inside the control panel to increase due to heating
resulting from the flow of electrical current through the load. The G3PJ
reliability can be increased by adding a ventilation fan to the control
panel to dispel this heat, thus lowering the ambient temperature of the
G3PJ.
(Arrhenius's law suggests that life expectancy is doubled by each
10°C reduction in ambient temperature.)
The G3PJ rated current
15 A
(A)
Required number of fans
per the G3PJ
Example: For 10 G3PJ with load currents of 15 A,
0.23  10 = 2.3
Thus, 3 fans would be required.
Note: 1. Size of fans: 92 mm  92 mm, Air volume: 0.7 m
Ambient temperature of control panel: 30C
2. If there are other instruments that generate heat in the
control panel in addition to the G3PJ, more ventilation will
be required.
3. Ambient temperature: The temperature that will allow the
G3PJ to cool by convection or other means.
G3PJ
Countermeasure 2
Duct
(No more
than 1/2
the SSR
depth is
recom-
Airflow
mended.)
Base
The G3PJ
The G3PJ
Duct
If the ducts cannot be made
lower, place the G3PJ on a
metal base so that it is not
surrounded by the ducts.
Ventilation
outlet
(Axial Fan)
The G3PJ
The G3PJ
25 A 35 A
0.23 0.39 0.54
3
/min,
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