Pentair TraceTek TTDM-128 Installation Instructions Manual page 5

connect the Sensing cable
If the TTDM-128 will be used to monitor a sensor directly, follow
these instructions to connect the sensor to the TTDM-128. If the
TTDM-128 is being used only as a network master, skip to Con-
necting the TraceTek Network.
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 oper-
ate 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-128 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.
connecting the TraceTek Network
If the TTDM-128 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.
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
wire 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.
• Place the positive and negative wire in the Ferrite clamp. Do
not place the shield wire inside the clamp. Close the clamp by
securing its latch to the snaps.
THERMAL MANAGEMENT SOLUTIONS
prepare sensing cable.
Ensure that the sensing cable has been installed and tested in ac-
cordance with the instructions provided with the cable.
prepare communication cable.
Ensure that the communication cable has been installed and
tested.
EN-TraceTekTTDM128-IM-H57341 03/13

SENSOR CABLE
PL
Ordinary Area
TTDM-128
Zener
barrier
Leader or jumper cable
PL

Ferrite clamp
RS-485 cable to next TraceTek module.
Black
Yellow
Green
Red
Class I, Division 1
(Zone 0 or Zone 1 in Europe)
Hazardous Location
/ / /
Sensing cable
Jumper cable

SHIELD
RS-485 (–)
RS-485 (+)
5 / 6