Audio Communications
Audio tone versions of the RFL 9745 can be supplied with two or four FSK audio tone transceivers. All transceivers are bidirectional and can be programmed for any operating fre¬quency or bandwidth between 300 and 4,000 Hz. Channel one can be set to operate as a modem channel.
Audio Interface Configurations
- Single Two-Wire Terminals
- Dual Two-Wire Terminals
- Single Four-Wire Terminals
- Dual Four-Wire Terminals
Recommended Channel Frequencies
- Range: 300 Hz to 4000 Hz
- Resolution: 1Hz
Transmit Level
- Adjustable from -40 dBm +10 dBm in 0.25 dB steps
Receiver Sensitivity
- Minimum Input Level: -40 dBm
- Maximum Input Level: 0 dBm
Receiver Dynamic Range (referenced to center point)
Adjacent Channel Rejection
60-Hz Rejection
- A received tone at -30 dBm will not be affected by a 50 Hz or 60 Hz signal as great as 40 Vrms with optional 50/60 Hz blocking filter.
Amplitude Stability
- The Transmit level will vary by no more than ±1 dB.
Spurious Output
- All harmonics and spurious outputs are at least 40 dB lower than the carrier.
Transmitter Stability
- The transmitter frequency is stable within 0.02 percent over the full range of temperature and input power variations.
Trip Boost
- Amplitude: Adjustable from zero to +12 dB in 1 dB steps.
- Duration: Adjustable from zero to 30 seconds in .5ms steps.
Input and Output Impedance
Digital Communications
The RFL 9745 is available with five types of serial digital interfaces: 56Kbps/RS-449, 64Kbps/G.703 Co-directional and Contra-directional interfaces, 64Kbps/X.21, and 2.048Mbps/G.703. The digital interfaces conform to the standards set forth in their respective specifications (RS-449, CCITT G.703, X.21).
Fiber Optic Communications
Fiber Optic Communications Interfaces and System Gains are as follows:
Short Haul Service Unit Fiber Optic Transceivers
Compliant to ANSI C37.94 Short Haul Fiber Standard
Fiber Type:
- 50 Micron core, 820/850 NM Multimode
- 62.5 Micron core, 820/850 NM Multimode
Optical Budget:
- 9db for 50 Micron core
- 13db for 62.5 Micron core
Fiber Connector: ST
Digital Connector:
- RS-449, 64kbps, DB37 Male Connector
- V.35, 64kbps, DB37 Male Connector
- X.21, 64 Kbps, DB15 Male Connector
- G.703, 64-768 Kbps, DB15 Male Connector
Input Power
Less than 5W with a 38-150VDC power supply input.
Real Time Clock
IRIG-B
The RFL 9745 accepts the IRIG-B Standard Time Code on a 1kHz modulated carrier. Nominal signal levels are 3.3 volts peak-to-peak (± 0.5v) for a logic “1” and 1 volt peak-to-peak (± 0.2v) for a logic “0”. The IRIG-B input presents a 3.7k ohm impedance and is transformer isolated.
Resolution
1 ms
Accuracy
Free Running: Within 1 minute per month Under IRIG-B Control ±1msecs
Reset
Manual or by IRIG-B code
Isolation
The RFL 9745’s RS-232 ports (front and rear panel) are isolated from circuit common and chassis ground to a surge withstand level of 500 Vdc.
Events Storage
The Sequence of Events Recorder can store up to 100 events. After this limit is reached, older events are overwritten. The Log Counters keep a running tally of the number of times each function, input, output and alarm is active. Up to 1,000,000 counts can be stored for each item.
RS-232 Interrogation Ports
The 9745 provides two RS-232 Ports, located on the front and rear of the chassis. The RS-232 Port located on the front of the chassis has priority. The front of the RS-232 port is configured as a DCE Interface. The rear RS-232 port is configured as a DTE Interface.
Data Rates
300 bps, 1200 bps, 2400 bps, 9600 bps or 19.2 Kbps. Selec¬tion is made using front panel switches.
Communication Parameters:
- Number of Data Bits: Eight
- Number of Stop Bits: One
- Parity: None
- Flow Control: XON/XOFF
I/O Options
The RFL 9745 can be configured with a maximum of two I/O modules. There is a Solid-State, a Relay/Solid-State, and a HS Relay version available. All versions provide four opti¬cally isolated keying inputs and three independent form “C” alarm output contacts.
Solid-State I/O
Optically Isolated Inputs
Quantity:
Required Operation Range:
24 Volt Units:
- 14.6 to 60 Vdc, Nominal Input
- Current 8.8 mA
48 Volt Units:
- 31 to 60 Vdc, Nominal Input
- Current 5.8 mA
125 Volt Units:
- 75 to 150 Vdc, Nominal Input
- Current 4.6 mA
250 Volt Units:
- 155 to 280 Vdc, Nominal Input
- Current 5.25 mA
Input Current:
Minimum Acceptable Pulse Width:
Solid-State Outputs
Quantity:
- Four per solid-state I/O module
Output Current:
- Maximum 1 ampere continuous
- 2 amperes for one minute
- 10 amperes for 100 msec
Open-Circuit Voltage:
S/S Pick-up Time:
Alarm Relays
Quantity: Three per I/O module
Contact Configurations:
Maximum Output Current:
Maximum Breaking Current:
- 1 ampere (non-inductive) at 125 Vdc; derated to 0.25 amperes at 280 Vdc
Open Circuit Voltage:
Relay/Solid-State I/O
Optically Isolated Inputs
Quantity:
Required Operation Range:
24 Volt Units:
- 14.6 to 60 Vdc, Nominal Input
- Current 8.8 mA
48 Volt Units:
- 31 to 60 Vdc, Nominal Input
- Current 5.8 mA
125 Volt Units:
- 75 to 150 Vdc, Nominal Input
- Current 4.6 mA
250 Volt Units:
- 155 to 280 Vdc, Nominal Input
- Current 5.25 mA
Input Current:
Minimum Acceptable Pulse Width:
Solid-State Outputs
Quantity:
- One per relay/solid-state I/O Module
Output Current:
- Maximum 1 ampere continuous
- 2 amperes for one minute
- 10 amperes for 100 ms.
48 Volt Units:
- Open-Circuit Voltage: 150 Vdc maximum
250 Volt Units:
- Open-Circuit Voltage: 280 Vdc maximum
S/S Pick-up Time:
Relay Output
Quantity:
Contact Configuration:
- SPST Form A or Form B - Jumper Selectable
Relay Pick-up Time:
Output Current Rating:
Surge:
Alarm Relays
Quantity:
Contact Configurations:
Maximum Output Current:
Maximum Breaking Current:
- 1 ampere (non-inductive) at 125 Vdc; derated to 0.25 amperes at 280 Vdc Open-Circuit Volt¬age: 280 Vdc maximum.
HS Relay I/O
Optically Isolated Inputs
Quantity:
Required Operation Range:
24 Volt Units:
- 14.6 to 60 Vdc, Nominal Input
- Current 8.8 mA
48 Volt Units:
- 31 to 60 Vdc, Nominal Input
- Current 5.8 mA
125 Volt Units:
- 75 to 150 Vdc, Nominal Input
- Current 4.6 mA
250 Volt Units:
- 155 to 280 Vdc, Nominal Input
Input Current:
Minimum Acceptable Pulse Width:
Relay Output
Quantity:
Contact Configuration:
- SPST Form A or Form B - Jumper Selectable
Relay Pick-up Time:
Output Current Rating:
Surge:
Alarm Relays
Quantity:
Contact Configurations:
Maximum Output Current:
Maximum Breaking Current:
- 1 ampere (non-inductive) at 125 Vdc; derated to 0.25 amperes at 280 Vdc
Open-Circuit Voltage:
Annunciator Chassis
The RFL 9745 can be supplied with an optional one rack unit Annunciator Chassis. This additional chassis is mounted below the standard Three Rack Unit Chassis and provides six programmable solid-state outputs. Each output can be individually programmed to provide specific output an¬nunciation, such as Trip Sent, Trip Received, RS-232 Port Active, etc.
Output Ratings
Maximum Output Current:
Breaking Current:
Auxiliary Trip Relays
The RFL 9745 can be configured with up to two auxiliary high speed trip relays which are mounted in either the pri¬mary or redundant power supply I/O module. The relays are typically controlled by one of the solid-state function outputs and provide two normally open and one normally closed contact each.
Relay Ratings:
Pick-up Time:
Contact Rating:
- 5 amperes continuous
- 30 amperes for 200 msec
General Specifications
Displayed Level Accuracy
- The levels displayed on the front panel and through remote access using PC APRIL will be within 1 dB of the actual values.
Operate Time
- Audio-Tone Units (average trip times—Dual-Tone System):
- ± 30 Hz Shift: 26.47 ms
- ± 42.5 Hz Shift: 20.57 ms
- ± 60 Hz Shift: 14.78 ms
- ± 75 Hz Shift: 12.65 ms
- ± 120 Hz Shift: 11.05 ms
- ± 150 Hz Shift: 10.12 ms
- ± 240 Hz Shift: 9.22 ms
- Digital and Fiber systems: 3 ms maximum in the most secure mode.
Pre-Trip Timer
- Adjustable in 0.5 ms steps
Trip Hold Timer
- Adjustable in 0.5 ms steps
Command Extend Timer
- Adjustable in 0.5 ms steps
Non-Volatile Storage
- All parameters relating to system operation are stored in electric erasable non-volatile RAM. All parameters related to event logging are stored in battery-backed RAM.
RFI Susceptibility
- ANSI PC37.90.2 (35 Volts/Meter)
- IEC 255-22-3 (RFI Class III)
Interface Dielectric Strength
- All contact inputs, solid-state outputs, power supply inputs and relay outputs meet the following specifications:
- ANSI C37.90-1989 (Dielectric)
- ANSI C37.90.1-1989 (SWC and Fast Transient)
- IEC 255-5 (1500 Vrms Breakdown Voltage and Impulse Withstand)
- IEC 255-22-1 (SWC Class III)
- IEC 255-22-2 (ESD Class III)
- IEC 255-22-4 (Fast-Transient Class III)
- IEC 834-1
Input Power Requirements (per IEC 834-1)
- 24 Vdc Supply: 19 to 29 Vdc (1500 mA Typical)
- 48/125 Vdc Supply: 38 to 150 Vdc (750/325 mA Typi¬cal)
- 250 Vdc Supply: 170 to 300 Vdc (150 mA Typical)
Power Supply
- A single or redundant power supply can be provided depend¬ing on the reliability of the application. For example a DTT application for a higher voltage level line may demand the dependability of a redundant power supply.
Temperature
- Operating: -30° C to +65° C (-22° F to +149° F)
- Storage: -40° C to +75° C (-40° F to +165° F)
Relative Humidity
- Up to 95 percent at +40° C (+104° F), non-condensing
Chassis Dimension
- The RFL 9745 chassis mounts in a standard 19-inch rack or cabinet and is three rack-units high (5.25 inches or 13.3 cm).
