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High Powered (>1 Amp) Non-Wiping Contact
An example of this kind of device is the KZ-4000 Series relay. Since
corrosion may form on the contacts, use of a voltage bias circuit will
overcome resistance caused by the corrosion. Add the voltage bias circuit
to the device in the manner illustrated above, using a 100K ohm,
one-half watt resistor. Set the XBN switch to Voltage mode.
Neon Lamps
In neon lamp applications, the circuit appears open when the lamp is off.
That grounds the binary input at one side and leaves a long wire on the
other, acting as an antenna and making the circuit sensitive to noise. Any
of the following modifications will keep a load across the input:
•
Add a pilot relay. (Set the XBN switch to contact mode.)
•
Connect across the lamp's built-in resistor, if it is accessible
(Figure 16). (Set the XBN switch to Voltage mode.)
•
Sense across an added series resistor, one tenth the size of the built-in
resistor (Figure 17). Use this method when the built-in resistor is
difficult to access. (Set XBN switch to Voltage mode.)
H
120 V
N
Figure 16: Connecting Across the Resistor for Neon Lamp Applications
Series Resistor Accessible
Neon
Point Multiplex Modules—Multiplex Binary
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