User manual

64
Output wiring
Checkpoints for output unit wiring
N There can be limits on the number of points that can be
simultaneously turned on or load current, based on the unit type.
Refer to the specification of each unit. Pay extra attention, in
particular, when ambient temperature is high.
N Connect protection circuit to inductive load or capacity load, etc. as
below.
N There can be current limitation per Common for output units, so
make sure not to exceed the allowed range.
Protection circuit for inductive load
N Connect protection circuit in parallel with the inductive load.
N In particular, when switching the DC inductive load with relay
output type, the protection circuit dramatically affects the lifetime of
a system. Make sure to connect diodes at both sides of the load.
AC load (Relay output type)
DC load
Surge absorber
Output unit
Load
Example of surge absorber
Resistance 50
Ω
Capacity 0.47
µ
F
ATTENTION) For SSR output type unit, use only a
resistor to prevent huge delay with switching to OFF.
Load
Varistor
Output
terminal
COM
terminal
Output
terminal
COM
terminal
Output unit
Diode
Load
Rated
diode
rating
Reverse withstand
voltage
3 times of load
voltage or more
Average rectified
current
Load current
error
Output unit
Output
terminal
COM
terminal