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Safety Precautions
Close Mounting
SSR Mounting Pitch
Panel Mounting
(At a rated ambient temperature of 40 C).
Duct or airflow obstruction
SSR
Vertical direction
80 mm min.
Relationship between SSRs and Ducts
Duct Height
Countermeasure (1)
50 mm max.
Duct or
airflow
obstruction
SSR
Vertical
direction
Duct or
airflow
obstruction
Do not surround the SSR
Use short ducts.
with ducts, otherwise the
heat radiation of the SSR
will be adversely affected.
Ventilation
Be aware of air flow
Duct or
air flow
obstruction
SSR
Air inlet
Note: 1. If the air inlet or air outlet has a filter, clean the filter regularly
to prevent it from clogging and 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
SSR Units to ensure the efficiency of the heat exchanger.
16
Solid State Relays
60 mm min.
30 mm min.
min.
Countermeasure (2)
(A height of no
more than half
the SSR's height is
recommended.)
Airflow
SSR
If the ducts cannot be
shortened, place the SSR
on a metal base so that it
is not surrounded by the
ducts.
Ventilation
outlet
(axial fan)
SSR
SSR
G3PA
• Please reduce the ambient temperature of SSRs.
The rated load current of an SSR is measured at an ambient
operating temperature of 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.)
SSR rated current (A)
Required number of fans
per SSR
Example: For 10 SSRs with load currents of 20 A,
0.31
10 = 3.1
Thus, 4 fans would be required.
Size of fans: 92 mm
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.
EMC Directive Compliance
The G3PA complies with EMC Directives under the following
conditions.
Input cable length
Input
SSR
• A film capacitor is connected to both sides of the load power supply
output.
• The input power supply cable length for 200-V models is less than
10 m.
Loss Time
Loss time will increase if the G3PA is used at a low voltage or
current. Check that there will be no problems with operation before
using the G3PA.
10 A
20 A
30 A
40 A
0.16
0.31
0.47
0.62
2
3
, Air volume: 0.7 m
/min,
Load
G3PA
Output
Film capacitor
1 F, 250 VAC
(G3PA-2@@)
Loss time
60 A
0.93
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