68
The
reverse dielectric strength of the diode must be 10 times the circuit voltage
and the forward current must be at least as high as that of the load. If the circuit
voltage
is low enough, as it is for most electronic circuits, then the reverse
dielec
-
tric strength of the diode can be as low as 2 to 3 times the circuit voltage.
Inductive
load
Power supply
Varistor (AC or DC)
The method
uses the fixed voltage characteristics of a varistor to prevent high
voltages
from being applied to the contacts. Here, as well, the reset time will be
increase somewhat.
Connect the varistor between the load connections for 24-V and 48-V power
supply voltages and between the contact connections for 100 to 200-V power
supply voltages.
Inductive
load
Power supply
Output Surge Current When
connecting an output device
having a high surge current (such as an in
-
candescent
lamp), use one of
the following circuit configurations to protect the
Output Unit.
The
following
circuit lets the load draw a small current (about one third the rated
current) while the output is OFF, significantly reducing the surge current.
OUT
COM
L
R
+
The following circuit reduces the surge current by employing a current-limiting
resistor.
LOUT
COM
+
R
Compliance with EC Directives Section 3-6
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