AQ8
SCHEMATIC AND WIRING DIAGRAMS
Output
configura-
tion
Schematic
Load
Wiring diagram
+
3
1
Input circuit
4
3
ZC
2
1
−
+
INPUT
LOAD
Zero-cross circuit
4
3
2
1
1 Form A
AC
Load
Operation
power
Load power
supply
Input circuit
4
2
−
NOTES
1. When used for the load less than
rated
• Characteristics of residual voltage vs.
load impedance
In case of the load current less than
rated, malfunction may result from the
residual voltage across the both ends of
the load even if the solid state relay is
turned off. Use a dummy resistor as a
countermeasure.
The total of the current through the
resistor and the load current must exceed
the min. rated load current.
100
f=60 Hz
Ve: Residual voltage
V: Power voltage
80
Load
Ve
1
V
SSR
2
60
40
20
Ve
V
(%)
100
×
Power factor: 1
(resistor load)
Power factor: 0.4
(induction load)
R0 Dummy resistor
Load
1
2
SSR
0
Load
power
source
10
20
30
40
50
Ω)
Load impedance (k
2. when the terminal is bent
Care shall be taken neither to apply
mechanical stresses to the mold area of
the solid state relay nor to bend the
terminal 45 degrees or more.
In case the dummy resistor is not used,
keep in mind that the residual voltage
becomes as follows:
Example:
For the inductive load by the 20 mA load
current and the 200 Vrms load voltage,
the load impedance becomes 10 kΩ and
Ve/V = 14% is estimated from the right
above graph. Accordingly, the 28 V
voltage remains across the both ends of
the load when the solid state relay is
turned off.
Max.
45°
Solid
state relay
Printed circuit board
Solder
ASCTB213E 201809-T
–6–