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TTDM-128  Installation Instructions

2

Reset

Test

Enter

Esc

Menu

TraceTek

TTDM

1

2

6

3

4

5

7

9

8

bk

bl

bm

bn

bo

bp
bq

br

bs

bt

ck

dk

cl

cm

cn

co

PL

PL

PL

cp

cq

cr

cs

ct

PL

1

LCD display

2

LEDs with icons

3

Test key

4

Silence key

5

Reset key

6

Menu keys

7

User Interface board

8

4–20 mA board (optional)

9

Sensor Interface board

bk

Motherboard

bl

Power supply board

bm

Fuse (500 mA, 250 V, time delay)

bn

Power cable terminal block

bo

Voltage Selector Switch

bp

Spare fuse

bq

Ground/earth stud

br

Gland plate

bs

Fault relay cable plug and socket

bt

Leak relay cable plug and socket

ck

Service relay cable plug and socket

cl

4–20 mA port plug and socket

cm

RS-232/485 host port plug and socket

cn

Sensing cable plug and socket

co

RS-485 TraceTek Network Plug
& Socket

cp

Ribbon cable

cq

Host port RS-232/485 selector

cr

9 pin RS-232 socket

cs

Reset pins

ct

Volume adjustment

dk

LCD contrast adjustment

PL

indicates power limited circuits

Note:

To avoid damage to the unit, store the TTDM module in its 

cardboard box until construction is complete.

Select the mounting position.

Choose a location indoors where the module will be protected from 

the elements and temperature extremes.

• Remove the module from its carton. Do not remove the protective film 

from the membrane on the front of the unit.

• Open the enclosure door using a flat-blade screwdriver or a coin.

Important: 

The TTDM is an electronic unit. During installation, take

the following precautions to avoid damage to its electronic components

:

• Handle with care, avoid mechanical damage.
• Keep the electronics dry.
• If handling circuit boards, hold them by their edges to avoid physical

contact with electronic components.

• Avoid exposure to static electricity.
• Avoid contamination with metal filings, liquids, or other foreign matter.

Installing the TTDM

WARNING: 

Ignition hazard. Do not mount the TTDM unit in a

hazardous location. Sensing cable connected to the TTDM may (subject

to approvals restrictions) be located in hazardous locations, but the

module itself must be in an ordinary area.

Note:

The TraceTek sensing circuit is power limited, so the TraceTek

leader or jumper cable and the power supply cable must not run in

the same conduit.

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