iDect FC6A series User Manual page 146

3: I
NSTALLATION AND
Output Protection Circuit
When a motor, solenoid, or similar inductive load is connected, the life of the contact is shortened due to the inrush current and
counter-electromotive force acting on the load. In order to prevent this, set up an output protection circuit outside the FC6A Series
MicroSmart. Choose a protection circuit from (1) through (4) shown below, according to the power supply, and connect the
protection circuit to the outside of the FC6A Series MicroSmart.
For protection of the transistor output of the FC6A Series MicroSmart modules, connect protection circuit (3) shown below to the
transistor output circuit.
Protection Circuit (1)
Output Q
COM
Protection Circuit (2)
Surge Killer
Output Q
COM
Protection Circuit (3)
Output Q
COM
Protection Circuit (4)
Output Q
COM
3-16
W
IRING
Inductive Load
C
R
Inductive Load
R C
or
– +
Inductive Load
Diode
– +
Inductive Load
Varistor
– +
or
FC6A S M S
ERIES ICRO MART
This protection circuit can be used when the load impedance is smaller
than the RC impedance in an AC load power circuit.
R: Resistor of approximately the same resistance value as the load
C: 0.1 to 1 µF
This protection circuit can be used for both AC and DC load power
circuits.
R: Resistor of approximately the same resistance value as the load
C: 0.1 to 1 µF
This protection circuit can be used for DC load power circuits.
Use a diode with the following ratings.
Reverse withstand voltage:
Forward current:
This protection circuit can be used for both AC and DC load power
circuits.
A - -O T U ' M
LL IN NE YPE SER S
Power voltage of the load circuit × 10
More than the load current
FC9Y-B1722
ANUAL