Single-phase Solid State Relays for Heaters
G3PE
453
Relationship between the G3PE and Ducts or Other
Objects Blocking Airflow
Ventilation Outside the Control Panel
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
G3PE to ensure the efficiency of the heat exchanger.
G3PE Ambient Temperature
15A and 25A models have ambient temperature of 40
°
C, while 35A
and 45A models have 25
°
C ambient Temperature. The G3PE 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 G3PE reliability can be
increased by adding a ventilation fan to the control panel to dispel
this heat, thus lowering the ambient temperature of the G3PE.
(Arrhenius's law suggests that life expectancy is doubled by each
10
°
C reduction in ambient temperature.)
Example: For 10 G3PE SSRs 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
3
/min,
Ambient temperature of control panel: 30
°
C
2.
If there are other instruments that generate heat in the
control panel in addition to SSRs, more ventilation will be re-
quired.
3.
Ambient temperature: The temperature that will allow the
SSR to cool by convection or other means.
SSR rated current (A)
15 A
25 A
35 A
45 A
Required number of
fans per SSR
0.23
0.39
0.54
0.70
Duct or other object
blocking airflow
Duct
Duct
Duct
Duct
Duct
Vertical
Direction
50 mm max.
Airflow
Base
SSR
SSR
SSR
Incorrect Example
Countermeasure 1
Countermeasure 2
Mounting surf
ace
Mounting surf
ace
Mounting surf
ace
If the depth direction of
the G3PE is obstructed by
ducts, the heat radiation
will be adversely affected.
(No more
than 1/2
the SSR
depth is
recom-
mended.)
Use ducts that have a
shallow depth, to provide
a sufficient ventilation
area.
If the ducts cannot be made
lower, place the G3PE on a
metal base so that it is not
surrounded by the ducts.
SSR
Air inlet
Be aware of airflow
Ventilation
outlet
(Axial Fan)
SSR
SSR
Duct or other object blocking airflow
