TTDM-128 Installation Instructions
5
If the TTDM will be used to monitor a sensor directly, follow these
instructions to connect the sensor to the TTDM. If the TTDM is being
used only as a network master, skip to Connecting the TraceTek Network.
Prepare sensing cable.
Ensure that the sensing cable has been installed and tested in accordance
with the instructions provided with the cable.
Make connections.
• Confirm that power to the unit has been shut off.
• Open the enclosure door.
• Feed the end of the TraceTek Leader Cable (or Jumper Cable) through
the gland plate
br
adapter/bushing into the enclosure.
• Remove the sensor cable plug
cn
from the socket on the sensor
interface board
9
.
• Connect the four color-coded wires to the Sensor Interface plug.
Important: Observe the color coding. If wires are not connected to the
proper terminals, the leak detection system cannot operate properly.
• Insert the sensing cable plug back into the socket on the Sensor
Interface Board
9
.
Install zener barrier, if applicable.
When sensing cable will be located in Class I, Division 1 (Zone 0 or Zone
1 in Europe) hazardous locations, approval agencies require that the
sensing cable be protected with a zener barrier between the sensing
cable and the TTDM module. Contact TraceTek to select the proper zener
barrier.
When installing a zener barrier, wire it in accordance with the instructions
provided with the kit.
If the TTDM will be used as the network master in a TraceTek network,
follow these instructions to connect the communication wiring.
Note:
Some TraceTek network configurations will require different
connections for the communication wiring. Please refer to the TTDM-128
User Manual for further details.
Prepare communication cable.
Ensure that the communication cable has been installed and tested.
Make connections.
• Confirm that power to the unit has been shut off.
• Open the enclosure door.
• Feed the end of the communication cable through the gland plate
br
adapter/bushing into the enclosure.
• Remove the J10 cable plug
co
from the socket.
• Connect the positive wire to terminal 3 (485+) and the
negative lead to terminal 4 (485–) of the J10 cable plug.
• Connect the shield wire to the round lug
bq
.
Important: Observe the polarity. If wires are not connected to the proper
terminals, the leak detection system cannot operate properly.
• Insert the J10 cable plug back into the socket
co
.
PL
RS-485 EXT XMTRS
J10
+51S0 ICDM 485+ 485-
1
2
3
4
RS-485 cable to
next TraceTek module.
RS-485 (–)
RS-485 (+)
SHIELD
co
bq
Connecting the TraceTek Network
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Class I, Division 1
(Zone 0 or Zone 1 in Europe)
Hazardous Location
Ordinary Area
Zener
barrier
Leader or jumper cable
Jumper cable
Sensing cable
TTDM
RED GRN YEL BLK
33
34
35
36
SENSOR CABLE
PL
Black
Yellow
Green
Red
cn
Connect the Sensing Cable
