Raychem TraceTek TTDM-1 Скачать руководство пользователя страница 19 | Manualshive

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Raychem TraceTek TTDM-1 Скачать руководство пользователя страница 19

TTDM Operation Diagram

The TTDM measures resistance of
each circuit loop independently to
ensure the integrity of the circuit.
The resistance of the yellow-black
loop is used to compute the “Test
Length” displayed in the System
Status screen; it is based on a
real-time measurement.

The TTDM measures current
“leakage” between the two sensing
loops. When a leak is present, the
TTDM limits the current to 270
microamps, and measures the
voltage difference between the
yellow and black wires. The resis-
tance along the black sensing wire
to the leak is determined by a
simple application of Ohm’s law
(R = V/I). The resistance per unit
length of the sensing wire is tightly
controlled in manufacturing, so
this location is easily computed.

33

Appendix 6 - TraceTek Technical Data

R

RG

R

YB

End
termination

End
termination

Loop resistances and test length

Sensing
cable

TTDM

D

V

Leak

D

V

Location

Leak current, resistance, location

Sensing
cable

TTDM

Current

R

Location

R

S-to-S

Red

Green

Yellow

Black

Red

Green

Yellow

Black

Relay wiring options

The illustrations below show how relays (15, 16, and 17 on foldout) can be jumpered
together to allow remote monitoring of the TTDM status with only a single pair of wires.
The TTDM

de-energizes its relays to signal an alarm condition. Therefore, loss of power

as well as any other type of alarm would trip the remote alarm.

Alarm on open circuit

Alarm on closed circuit

SERVICE RELAY

5A 250V

J6

LEAK RELAY

5A 250V

J25

FAULT RELAY

5A 250V

J9

1

1

1

NC NO COM NC NO COM

15

16

17

18

19

20

NC NO COM NC NO COM

21

22

23

24

25

26

NC NO COM NC NO COM

27

28

29

30

31

32

Monitoring circuit
(alarm on closed circuit)

Relays wired
in parallel

SERVICE RELAY

5A 250V

J6

LEAK RELAY

5A 250V

J25

FAULT RELAY

5A 250V

J9

1

1

1

NC NO COM NC NO COM

15

16

17

18

19

20

NC NO COM NC NO COM

21

22

23

24

25

26

NC NO COM NC NO COM

27

28

29

30

31

32

Monitoring circuit
(alarm on open circuit)

Relays wired
in series

32

Appendix 5 - Wiring Details

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18
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Содержание TraceTek TTDM-1

Страница 1: ... PCN 137021 3 97 TraceTek is a trademark of Raychem Corporation All information including illustrations is believed to be reliable Users however should independently evaluate the suitability of each product for their application Raychem makes no warranties as to the accuracy or completeness of the information and disclaims any liability regarding its use Raychem s only obligations are those in the...

Страница 2: ...to various features that may be viewed and or edited The menus are navigated with the arrow keys together with the Esc escape and Enter keys Internal View B 7 User interface board 8 4 20 mA board 9 Sensor interface board 10 Motherboard 11 Power supply board 12 Fuse 200 mA 250 V 13 Power cable terminal block 14 Ground earth stud 15 Fault relay cable plug and socket 16 Leak relay cable plug and sock...

Страница 3: ...eries sensing cables and all TT100 TT300 and TT500 series long line sensing cables TTDM can monitor up to 5000 ft 1500 m of sensing cable and can detect and locate the presence of liquid at any point along the cable The module also monitors the system for other alarm conditions Service required Fault Each event service leak or fault is recorded in an Events History with the time and date of occurr...

Страница 4: ... then signals the alarm and displays the distance to the leak The longline system includes sensing cable and circuit components leader cable jumper cables end terminations weighted lengths and branching connectors with connectors that allow components of the system to plug together The weighted length resistor simulates a 15 ft 5 m length of sensing cable Installed at the boundary between two area...

Страница 5: ...contacts with normally open and normally closed contacts both provided The relays are de energized to indicate an alarm condition The diagram below shows the relay status when each is in an alarm de energized state For other connection options please consult Appendix 5 Wiring Details 4 20 mA The module is equipped with an analog 4 20 mA interface The TTDM adjusts its current output based on whethe...

Страница 6: ...ine 4 displays the current time and date the colon blinks once a second To highlight the present status the line of the display with the most recent event flashes Hint The LCD contrast may be adjusted 24 on foldout Leak 10 ft Leak Cleared Press Reset 16 30 14 Feb 1996 The Icons The Icons 2 on foldout represent the four main states of the TTDM module Monitoring This green LED indicates that the TTD...

Страница 7: ...t see Auto Reset under Leak Settings on page 23 Once the Reset button is pressed the relay returns to normal the red Leak LED extinguishes and the LCD display changes System Normal 16 53 14 Feb 1996 Leak 10 ft Leak Cleared Press Reset 16 30 14 Feb 1996 If the TTDM unit has been installed correctly and the system is clear the LCD display will appear as follows Leak When liquid is detected the follo...

Страница 8: ...x 6 The TTDM module constantly monitors to see whether current is passing between the loops When the system is normal there is no current passing between the loops When there is a leak on the system the maximum current flows just 270 µA the sensing cable operates on low voltage and is safe to touch If however the TTDM module detects a lower but significant level of current flow between the loops i...

Страница 9: ...ed A connection is damaged There is a problem with the module What the Module Does The following shows how the alarm display would appear if the fault were caused by a broken or disconnected cable The TTDM would display a different message for a differ ent type of fault such as a loss of continuity in only one of the sensing loops When a fault condition is detected the following occur An audible a...

Страница 10: ...vents in memory TTDM gives a direct indication of multiple events that is events which happen after an initial leak but before the module is manually reset The first line of the display always indicates where the liquid was first detected This location is the most useful in identifying the source of the leak The second line displays the most recent event For example The second line flashes to high...

Страница 11: ...eqÕd 237 16 53 28 Feb 1996 16 17 Additional Leak If liquid contacts the sensing cable away from the initial leak the module will re alarm If the location is distant from the last alarm the TTDM shows a location in square brackets Brackets indicate that the value shown requires interpretation when an additional leak occurs the value represents the electrical center of the leaks The display also pro...

Страница 12: ...n store up to 512 events If 512 events are already stored the oldest event is discarded as a new event is registered When this has occurred the Events History leaves the bottom line of the display blank Contact Raychem for assistance if you wish to clear the event history Events History Leak 250 ft 09 01 13 Feb 95 21 of 23 Events History Leak Cleared 11 33 15 Feb 95 22 of 23 Events History Reset 0...

Страница 13: ... the location of the leak see Appendix 6 for detail SI Status UI Status These hexadecimal values indicate the current status of the Sensor Interface and User Interface respectively and may assist factory personnel providing diagnostic support SI Comm This indicates the success rate in percent for communications between the Sensor Interface and User Interface boards A value below 90 may indicate a ...

Страница 14: ...djusted 23 on foldout You gain access to the system s settings through the View Edit Settings Menu which is on the main menu see Appendix 1 Menu Structure on page 25 Four types of set tings are available General Leak Ports Self Test In certain parts of the menu structure settings may be changed only after entering a password Entering a Password When an attempt is made to change a restricted settin...

Страница 15: ...orked Contact Raychem for additional information Terminal This selection provides a real time display of communications to and from a modem or host system which can be helpful for diagnostic purposes Self Test Settings You gain access to the Self Test settings through the Self Test Menu the last item on the View Edit Settings Menu see page 25 for the menu structure The Self Test Menu allows indivi...

Страница 16: ... without brackets This likely means the leak is moving or drying New location detected more than 25 ft 8 m from original location TTDM displays most recent average location in square brackets This may indicate a new leak or a new point of contact with a serpentined cable Automatic re alarm after the Re alarm interval a user setting if the leak condition still exists Leak Cleared Displayed when cab...

Страница 17: ... It is recommended that the TraceTek system be thoroughly checked twice a year Such a check will identify conditions that adversely affect the leak locating capability of the sys tem More frequent checks may be required if the sensing cable is repeatedly exposed to leaks or if construction or repair work is done where the sensing cable may be exposed Contact your local Raychem TraceTek representat...

Страница 18: ... 23 24 25 26 NC NO COM NC NO COM 27 28 29 30 31 32 4 20 mA Current Transmitter The TTDM adjusts its 4 20 mA output based on the leak detection status as detailed below Fault conditions Output mA Description 0 Electronic fault or loss of power 1 00 Fault communications between SI and UI boards 2 00 Fault cable break 3 00 Fault cable damage loop imbalance 3 50 Service Required alarm Normal condition...

Страница 19: ...VLocation Leak current resistance location Sensing cable TTDM Current RLocation RS to S Red Green Yellow Black Red Green Yellow Black Relay wiring options The illustrations below show how relays 15 16 and 17 on foldout can be jumpered together to allow remote monitoring of the TTDM status with only a single pair of wires The TTDM de energizes its relays to signal an alarm condition Therefore loss ...

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