drop can become appreciable in situations where belt pack operation wouldn’t nor- mally be impacted. Performing accurate calculations in this scenario is a bit more difficult but might be required to ensure a reliable installation.
Initial Operation
As soon as a source of power is applied the Model 45 will begin its
Configuration
To support the needs of various applica- tions the Model 45 allows a number of operating parameters to be configured. A
Using the Connected
Model 45’s Power Source
Configuration DIP switch 1 is used to select whether or not the connected
45.This ensures that no current will be drawn from the intercom circuit, some- thing that can be important if the circuit is limited in available current, or if the length of the interconnecting cable is excessive. When switch 1 is in its on (up) position the
It’s important to remember that if an ex- ternal source of 24 volts DC is connected it will always be used as the Model 45’s power source. Even if switch 1 is in its on (up) position, power will be drawn from the connected intercom circuit only if the external source of 24 volts DC is not present. With that in mind, it’s highly recommended that unless the application has been carefully designed, any time an
Figure 6. Details of front panel showing the five configuration DIP switches and the configuration switches chart
Issue Preliminary 2, March 2009 | Model 45 User Guide |
Page 16 | Studio Technologies, Inc. |