Panasonic AQ-C Relays - Manual (Page 5)

AQ-C
NOTE
For Cautions for Use.
When used for the load less than rated
In the 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. 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 5 mA load
current and the 200 V AC load voltage,
the load impedance becomes 40 kW and
Ve/V = 16% is estimated from the below
graph.
Accordingly, the 32 V voltage remains
across the both ends of the load when
the solid state relay is turned off. • Characteristics of residual voltage
vs. load impedance
16 1
Load power source
Input power source
5
8
+ –
Load
R
0
(Dummy resistor)
( + )
( – )
0
20 40
20
40
60
100,%
80
100
60 80 100
Ve
Ve
V
V SSR
1
2
Load
×
f = 60 Hz
Ve: Residual voltage
V: Power voltage
Power factor: 1
(resistive load)
Power factor: 0.4
(inductive load)
Load impedance, k Ω
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