Bourns 1800 Series Manuale

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Bourns
®
Model 1800 Series Signal and Dataline Protectors are designed to protect sensitive electronic circuits and components from damaging
surge voltages and currents. Their extremely fast response and low clamping voltages make them particularly suitable for the protection of
signal and data lines associated with computer, data communication, instrumentation, broadcasting and industrial controls. They may be used
directly with EIA standard interfaces RS-232, RS-422, RS-423, RS-485 and with 20 mA and 50 mA instrumentation loops. The Model 1800
Series Signal and Dataline Protectors are fast, rugged and capable of protecting against fast rising voltage transients as well as the severe
current surges associated with lightning discharges.
Method of Operation
Bourns
®
Model 1800 Series are heavy-duty, multi-staged protectors. A solid-state section intercepts the leading edge of the surge with sub-
nanosecond response time. Within microseconds a 3-pole common chambered gas tube capable of handling 20,000 ampere lightning
currents operates and crowbars the surge to ground. The protector remains in the crowbar state until the surge has passed and line voltages
return to safe levels, then automatically restores the line to normal operation. There is no need for resetting a breakeror replacing a fuse.
Application
Protectors are generally placed at each end of a signal or data line or current loop. In the case of daisy-chain confi gurations (such as RS-485),
protectors are placed at each node. The 1820 models provide both line-to-ground and line-to-line protection and are designed to use on differ-
ential signals (such as RS-422 or RS-485) and 4-20 mA current loops. 1810 models provide line-to-ground protection for two separate circuits
and are designed for use on ground referenced signals (such as RS-232) where the return wire is grounded at the protector. The 1811 and 1821
models provide the same protection modes for high frequency applications.
Related Bourns
®
Protectors
For outdoor applications with 1/2 inch NPT ports (such as fi eld-mounted 4-20 mA transmitters), please refer to Bourns
Protector. In this application, the mixed use of a Model 1800 Series Protector at the controller and a Model 1669 Series Protector at the fi eld is
recommended.
Characteristics @ 25 °C
Surge Life
>100 operations with 200 Amps ....................................................................................................... 10 x 1000 μsec
>10 operations with 10,000 Amps .................................................................................................... 8 x 20 μsec
DC Leakage Current at Rated L/G Voltage ........................................................................................... <10 μAmps
Signal/Data Attenuation at Maximum Data Rate ................................................................................... 3 db with 600 Ω termination
Operating Temperature .......................................................................................................................... -40 ºC to + 60 ºC
Response Time...................................................................................................................................... 50 pico-seconds
Wire Size ............................................................................................................................................... 22-14 AWG
INTERFACE OPERATING
CHARACTERISTICS
NUMBER
Peak
Max.
Signal
Data
(see below
Voltage
Rate
for Clamp
designation)
L/L
L/G
(Volts) (Volts)
(MHz)
20
10
10
1810-10-XX
10
10
4
1820-10-XX
20
10
50
1811-10-XX
10
10
50
1821-10-XX
30
15
8
1810-15-XX
15
15
3
1820-15-XX
30
15
45
1811-15-XX
15
15
45
1821-15-XX
56
28
9
1810-28-XX
28
28
4
1820-28-XX
56
28
40
1811-28-XX
28
28
40
1821-28-XX
100
50
10
1810-50-XX
50
50
4
1820-50-XX
The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.
Features
■
Low peak clamping voltage even during
severe current surges
■
Ability to repeatedly protect against surge
currents in excess of 10,000 amperes
■
Convenient mounting and grounding to any
fl at surface or to Din 1 (TS-32) or DIN-3
(TS-35) rail
1800 Series – Signal and Dataline Protector
PROTECTIVE CHARACTERISTICS
Peak Clamping Voltages
BASE
MODEL
@ 5000 Amps,
8x20 μsec
Surge and Voltage
Rate-of-Rise of
100 kV / μsec
L/L
L/G
(Volts)
(Volts)
50
25
25
25
60
30
30
30
70
35
35
35
80
40
40
40
110
55
55
55
120
60
60
60
178
89
89
89
■
■
■
LOAD
CURRENT
@ 1000 Amps,
8x20 μsec
Surge and Voltage
Rate-of-Rise of
500 V / μsec
L/L
L/G
(Volts)
(Volts)
(mA)
42
21
220
21
21
220
52
26
350
26
26
350
56
28
180
28
28
180
64
32
300
64
32
300
90
45
150
45
45
150
45
45
250
45
45
250
156
89
100
45
45
100
Users should verify actual device performance in their specifi c applications.
Cable shields are passed through and
may be either grounded or not grounded at
the protector
Vibration-proof screw-type clamp terminals
Flame-resistant epoxy-fi lled housing
®
Model 1669 Series
TYPICAL
SERIES
CAPACITANCE
RESISTANCE
Each Line L/L
L/G
L/L
(Input to output)
(pF)
(pF)
(Ohms)
2200
1200
3300
3300
45
45
65
65
1500
750
2300
2300
45
45
65
65
1100
600
1800
1800
45
45
65
65
500
300
800
800
Specifi cations are subject to change without notice.
10
10
10
10
15
15
15
15
22
22
22
22
51
51