Robust DataComm rdcLPU-com Lightning Protector 规格指南
Making Industrial Data Flow Like Water ... Safely, Silently, & Sanely
Robust DataComm Pte Ltd (USA) 26471 Portola Pkwy #1E-242, Foothill Ranch CA 92610-1743, +1,972-248-7466
(International) 18 Kaki Bukit Road 3 #02-08 Entrepreneur Business Centre Singapore 415978, +65,6487-5624
(International) 18 Kaki Bukit Road 3 #02-08 Entrepreneur Business Centre Singapore 415978, +65,6487-5624
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The rdcLPU is especially designed for use with
RobustDC's isolated products. One rdcLPU fully
protects 2-wire RS-485 or 3-wire RS-232 circuits.
Built-in self-resetting current limitors both elimi-
nate the need for external fuses and protects
from common continous over-voltage faults.
RobustDC's isolated products. One rdcLPU fully
protects 2-wire RS-485 or 3-wire RS-232 circuits.
Built-in self-resetting current limitors both elimi-
nate the need for external fuses and protects
from common continous over-voltage faults.
Model: rdcLPU
Effective Lightning Protection for Isolated
RS-232/422/485 Data Comm Circuits
RS-232/422/485 Data Comm Circuits
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Dimensions in mm (and inches)
Specification
Order Information
rdcLPU-com
Nominal Voltage
Nominal Current
Series Resistence
Impulse Discharge
Course Protection
Fine Protection
Current Limiting
Capacative Effect
Supportted Speeds
: -40C to +65C
: -40C to +100C
: 10 to 90% RH, non-condensing
: wire up to 2.5mm (12 AWG)
: fungus and termite resistant, self-extinguishing
: approx 130g
: DIN EN 50 022 or DIN EN 50 035
: -40C to +100C
: 10 to 90% RH, non-condensing
: wire up to 2.5mm (12 AWG)
: fungus and termite resistant, self-extinguishing
: approx 130g
: DIN EN 50 022 or DIN EN 50 035
Mechanical / Environment
Surge Management
Specifications subject to change without notice.
25 (1.0)
79 (3.1)
8
5
.5
(3
.4
)
90.5 (
3.6)
93.0 (
3.7)
EN 50 022 - 7.5mm
EN 50 035
EN 50 022 - 15mm
EN 50 035
EN 50 022 - 15mm
Block Diagram
Copyright © 1999 RobustDC
Field Cable
Do+/Tx
DO-/Rx
Earth
Operating Range
Storage Range
Relative Humidity
Terminals
Case Material
Weight
Mounting Rail
: +/- 15 vdc (suitable for RS-232/422/485)
: 250mA (normal maximum for RS-485)
: 6.5 ohm (at 25 °C with minimum current)
: 20kA (wave form 8/20µs per IEC 801.5)
: Ceramic Gas Discharge Tube
: High-Speed Transient Suppressor Diode
: Positive Temperature Coefficient Thermistor
: adds approx 4000 pF per wire
: 300 to 38kbps
: 250mA (normal maximum for RS-485)
: 6.5 ohm (at 25 °C with minimum current)
: 20kA (wave form 8/20µs per IEC 801.5)
: Ceramic Gas Discharge Tube
: High-Speed Transient Suppressor Diode
: Positive Temperature Coefficient Thermistor
: adds approx 4000 pF per wire
: 300 to 38kbps
Di+/Tx
Di-/Rx
SGnd
Co
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se
Pr
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n
Fin
e
Pr
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Self-Resetting
Current
Limiting
(note: no other options)
LPU
LPU
IR
LPU
LPU
LPU
IR
T
T
T
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rdc485ir3
+ rdcLPU
+ rdcLPU
IC
LPU
IR
T
Legend
Isolated RS-232 to
RS-485 (2-wire) Converter
RS-485 (2-wire) Converter
Isolated RS-485
(2-wire) Repeater
(2-wire) Repeater
Lightning Protection Unit
for Isolated Data Comm
for Isolated Data Comm
RS-485 Terminating
Resister (120 ohms)
Resister (120 ohms)
rdc485ic
+ rdcLPU
+ rdcLPU
rdc485ir3
+ rdcLPU
+ rdcLPU
Example rdcLPU use with
isolated RS-485 (2-wire)
between 5 sites
Site #1
Site #2
Site #3
Site #5
Site #4
Note the use of rdc485ir3
(Isolated RS-485 Repeaters) to increase
robustness & simplify troubleshooting.
Key features include:
• Up to 20kA impulse discharge (8/20µs wave)
• Self-resetting current limited to 250mA
• Simplifies ground wire installation
• Up to 20kA impulse discharge (8/20µs wave)
• Self-resetting current limited to 250mA
• Simplifies ground wire installation
Equipment
www.robustdc.com