Microscan HAWK MV-4000, Manual

Page: 44 / 142

Chapter 2
System Components
2-30 HAWK MV-4000 Smart Camera Guide
Bleeding Resistor
By default, if properly configured, the current should flow from the Input pin to the Input
Common pin (when connected to a sourcing device), or from the Input Common pin to the
Input pin (when connected to a sinking device). In some cases, the amount of current
going through the sensing circuit is insufficient for the connected output device to match its
minimum current requirement when the device is in an on or off-state, depending on the
configuration of the circuit. To boost the flowing current, connect a 2.2 kOhm external
bleeder resistor between the Input and Input Common pins. For example:
(Equivalent circuit only.)
About the Connections in the Following Subsections
The following subsections detail how to connect the most common third-party devices to
the HAWK MV-4000 input signals.
Note that HAWK MV-4000 input signals are optically isolated. Ground is only shown in the
following subsections for reference, in case you need to reference your return path to ground.
Power, as depicted in the following diagrams, represents a nominal voltage of 24 V (+/-
10%). For minimum and maximum voltage requirements, refer to the electrical
specification of the optoisolated input signals, in the Electrical specifications subsection in
Appendix C: General Specifications.