Sine Systems RFC-1/B Instruction Book

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seconds is required before a "Status: Off reading is reached after the external contacts open.
The telemetry calibration potentiometer should be set so that when the external contacts
close, a "Status: On" reading is achieved.
Alternately, the RFC-1 power supply may be used to furnish a voltage for status indications.
However, this should only be done if neither side of the internal power supply will be grounded
and if relatively short wiring runs are possible. The power supply for the RFC-1 must remain
"floating" and should not be exposed to the possibility of transient high voltage. The negative
side of the internal power supply is available on conductor number 15 and the positive side
(+10 volts) is available on conductor 14 of the interconnect cable, counting from the right.
Generally speaking, is it easier and safer to use a separate external power supply for powering
status circuits.
The previous illustration is only one of many possibilities of how status indication can be
accomplished. For example, if you wanted a closed contact to read "Status: Off you could
connect the voltage source through a IK ohm resistor to the positive telemetry terminal and
bridge the monitored contacts across the positive and negative telemetry terminals. A closed
contact would "short" the voltage and produce a "Status: Off indication. Also, in many cases
it will be convenient to use an externally generated voltage to indicate status. Suppose, for
example, that you wanted to monitor a large AC contactor which did not have auxiliary
contacts. A small step-down transformer could be placed across the coil of the contactor and
the resulting low voltage AC could be routed through a series diode and resistor (about IK) to
the telemetry input. The 10 pF capacitor on the RP-8 panel is sufficient for filtering.
Remember that 16 volts DC is maximum voltage that should be applied across the "+" and
terminals.
Control Outputs
Each RP-8 panel has 8 "ON" relay outputs and 8 "OFF" relay outputs. Each output is form C
(SPDT), floating, and rated at 120 volts AC, 5 amperes resistive, 2 amperes inductive.
/A WARNING!
/ * \ Although the control relay contacts are rated for 120
volts AC, we highly recommend that you bring only low voltage AC or DC to
the RP-8 panel. This is because of the large number of exposed terminals that
would be hazardous to maintenance or operating personnel if high voltage
were present.
The control relays on the RP-8 panels operate "momentarily." In other words, the relay
operates as long as the or "#" key is pushed on the telephone keypad. If latched operation
is needed, an external latching relay is required. This can be either a mechanically or
magnetically latched relay. For many applications, an electrically latched relay can be used.
The following diagram illustrates two examples of this:
3.00.2
Installation page 5.6

Sine Systems RFC-1/B Specifications

General

Brand	Sine Systems
Model	RFC-1/B
Category	Remote Control
Language	English