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Output wiring examples
• Connect a protective circuit such as the one shown below when switching inductive loads.
When switching DC type inductive loads with a relay output type, be sure to connect a diode across the ends of the
load.
When using an AC inductive load
When using a capacitive load
• Mounting the protective device
In the actual circuit, it is necessary to locate the protective device (diode, resistor, capacitor, varister, etc.) in the
immediate vicinity of the load or contact. If located too far away, the effectiveness of the protective device may
diminish. As a guide, the distance should be within 50 cm (19.685 in.).
Type of load
Resistive load
Solenoid load
Motor load
Incandescent lamp load
Mercury lamp load
Sodium vapor lamp load
Capacitive load
Transformer load
Inrush current
Steady state current
10 to 20 times the
steady state current
5 to 10 times the
steady state current
10 to 15 times the
steady state current
Approx. 3 times the
steady state current
1 to 3 times the
steady state current
20 to 40 times the
steady state current
5 to 15 times the
steady state current
• Type of load and inrush current
The type of load and its inrush current
characteristics, together with the
switching frequency are important
factors which cause contact welding.
Particularly for loads with inrush
currents, measure the steady state
current and inrush current and use a
relay or magnet switch which provides
an ample margin of safety. The table on
the right shows the relationship between
typical loads and their inrush currents.
0 V or
COM
FP-M
Output
terminal
Capacitive load
Resistor
0 V or
COM
FP-M
Output
terminal
Capacitive load
Coil
COM
FP-M
Output
terminal
AC inductive load
Surge absorber
Example:
R
C
COM
FP-M
Output
terminal
AC inductive load
Varister
0 V or
COM
FP-M
Output
terminal
DC inductive load
Diode
R: 50
Ω
C: 0.47
µ
F
54
4-3. Wiring
When using a DC inductive load
Содержание FP-M Hardware
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