Raychem TTDM-128 Leak Detection and Location Central Unit
Installation Instructions
General Information
Read these instructions carefully and keep them in a safe place (preferably near the TTDM unit) for future reference. Strictly follow these instructions to ensure proper operation of the unit.
The TTDM leak detection and location central unit is designed specifically for detection cables, spot sensors, sensor interface modules, and Tracetek relay modules. The TTDM unit can monitor up to 1500 m of detection cable or large networks of remote leak detection modules.
It is recommended to equip the TTDM with a circuit breaker and branch circuit protection (under 20 A rated capacity). The circuit breaker must be clearly identified as such. Comply with national and local codes applicable to the installation.
WARNING: RISK OF ELECTRIC SHOCK. DISCONNECT POWER BEFORE OPENING THE ENCLOSURE DOOR.
Tools Required:
- Drill for electrical conduit passages
- Phillips head screwdriver
- Small flathead screwdriver
Storage: Store the unit in a dry location before installation to prevent degradation of internal components.
Product Information
| Product | Specifications |
|---|---|
| TTDM-128 | 115 Vac +15%, -20%; 50/60 Hz 230 Vac ±10%; 50/60 Hz |
| TTDM-128-24V | 24 Vac +5%, -35% 24 Vdc ±20% |
| Power Consumption | 6 VA (5 W) for TTDM-128 12 VA (10 W) for TTDM-128-24V |
| Installation Categories | Overvoltage category II, Pollution level 2 |
| Built-in Relays | Number: Three (Service, Leak, Fault) Type: DPDT Capacity: 5 A at 250 Vac/24 Vdc |
| Temperature | Storage: -18 to +60°C Operating: 0 to 50°C |
| Enclosure | NEMA 12; IP 54 |
TTDM Installation
General Notes: To avoid damaging the unit, keep the TTDM in its carton until the mounting location is prepared.
IMPORTANT: The TTDM is an electronic unit. During installation, take the following precautions to prevent damage to electronic components:
- Handle the unit with care and avoid mechanical damage.
- Keep electronic components dry.
- If handling printed circuit boards, hold them by the edges to avoid physical contact with components.
- Avoid exposure to static electricity.
- Avoid contamination from filings, liquid ingress, or foreign objects.
Location Choice:
Choose an indoor location where the unit will be protected from weather and extreme temperatures. Remove the unit from its packaging. Do not remove the protective film from the membrane on the front of the unit. Open the enclosure door using a flathead screwdriver or a coin.
WARNING: RISK OF INFLAMMATION. Do not install the TTDM unit in an explosive atmosphere. The detection cable connected to the TTDM may (depending on approval limits) be located in hazardous areas, but the unit itself must be in an ordinary zone.
NOTE: The Tracetek detection circuit is power-limited. Therefore, the Tracetek connection or jumper cable and the power supply cable must not run through the same conduit.
Enclosure Mounting
The enclosure is mounted using four screws passing through the pre-drilled 8 mm holes as shown in Figure 3. If the mounting holes have plastic covers, remove them. Ensure the rubber washers (supplied with the enclosure) are properly fitted on the holes to maintain Nema 12 and IP 54 protection.
Figure 3: Mounting Dimensions
Diagram shows enclosure dimensions: 300 mm (11.81 in) width, 261 mm (10.26 in) height. Mounting holes are 8 mm in diameter, spaced 200 mm (7.87 in) vertically and 240 mm (9.45 in) horizontally. Points for motherboard fixation (four screws) are indicated.
Cable Entry Through Removable Gland Plate:
The removable gland plate (labeled 'br') under the enclosure allows cables to pass through. The plate is secured by eight screws. Unscrew these to remove the plate, then drill or stamp the plate according to your application. There is sufficient space to drill five M20 holes. Remove all iron filings and dust from the plate before reassembling. Be careful not to damage the gasket. You must reconnect the ground wire from the plate to the enclosure's ground terminal after reassembly.
Figure 4: Gland Plate Detail
Diagram shows the gland plate, gasket, screws, and a ground wire connection point labeled "Fil de masse à rebrancher à la prise de terre 62 du boîtier." (Ground wire to be reconnected to the enclosure's ground terminal 62).
Electrical Cable and Relay Connections
Power Cable Connection
Open the TTDM enclosure door. For 120/220 Vac power, select the voltage on the voltage selection switch (labeled 'bo'). Feed the power cable through the gland into the enclosure. Connect the ground/earth cable to the ground/earth terminal (labeled 'bq'). The ground terminal is indicated by the symbol: ⏚. It is important to make an effective ground connection to avoid electrical interface risks. The ground wire should be longer than the other two to prevent strain on the cable.
Remove the power cable plug from the socket on the power supply card (labeled 'bl'). Connect the conductors to the two-pin terminal (labeled 'bn') on the power supply card. Terminal L2 is for neutral, if marked. The terminals accept conductors of 4 mm² or smaller. We recommend using 2.5 mm² conductors with appropriate power circuit protection, rated for at least 65°C. Reconnect the power cable plug into its housing on the power supply card.
Power Input Diagrams
Diagrams show wiring for 120/240 Vac input and 24 V input, indicating connection points labeled '11', '13', and '14'. For 120/240 Vac, a note indicates "Le cas échéant, raccorder le neutre à L2" (If applicable, connect neutral to L2). A warning "Ne pas dépasser la tension maximale" (Do not exceed maximum voltage) is shown for both inputs.
Alarm Relay Connections
The TTDM has three relays: Service (ck), Leak (bt), and Fault (bs). Each relay has two changeover (C) contacts; normally open (NO) and normally closed (NC) contacts are also provided. The relays are dry contacts for indicating an alarm condition. The illustration shows the state of the relays when in an alarm condition (dry contacts).
The following illustrations show how to bridge the relays to allow remote monitoring of the TTDM's status using a pair of conductors. The TTDM de-energizes its relays to signal an alarm condition. Therefore, a power loss, like any other alarm type, triggers a remote alarm.
NOTE: Relay terminals accept conductors of 4 mm² or smaller. We recommend 1.5 mm² conductors. The cable must be rated for a maximum temperature of 65°C. The maximum load for each relay is 5 A.
Relay Wiring Diagrams
Diagrams illustrate relay connections for "Alarm in open circuit" and "Alarm in closed circuit". These show how the Service, Leak, and Fault relays (labeled 20, 19, 18 respectively) can be wired in series or parallel for control circuits.
Central Unit Test
Test After Power-Up:
- Close and lock the enclosure door.
- Apply power to the unit. Upon power-up, the green diode will light up, and the unit will perform a series of self-diagnostics. When the startup sequence is complete, the unit should emit a fault alarm signal (this is normal, as no detection cable is connected). Press the red mute button to silence the audible alarm. Verify that the display screen matches the illustration (showing current time and date).
- If anything else occurs, check all connections. If the unit still appears not to function correctly, contact a Tracetek representative.
- Press the test button. The unit performs a series of self-diagnostics.
- If the tests complete without issues, record this operation in the installation log.
- Turn off power to the unit.
System Status Display
Diagram shows the display status "CH01 Cable cut" with time and date, and "CH01 Leak 164 m" with time and date, indicating leak detection events and distances. The text notes that the leak distance should be between 160 to 168 meters or 11 zones, depending on the selected unit.
Test Using TTDM Test Plug
For a more thorough test, use the TTDM test plug (packaged in a plastic bag with the TTDM). Insert the plug into the detector interface card socket (labeled '9').
Close and lock the enclosure door. Apply power to the unit. Upon power-up, it will again perform a series of self-diagnostics. If the test plug is inserted into the detection cable socket, the unit should emit a leak alarm signal as soon as the startup sequence is complete. Press the mute button to silence the audible alarm. The red leak diode and the green control diode should light up, and the display should resemble the one indicated (depending on configuration).
If anything else occurs, check all connections. If the unit still appears not to function correctly, contact a Tracetek representative.
If the test completes without issues, record this operation in the installation log.
Turn off power to the unit.
Remove the TTDM test plug and store it in a safe place for future use.
If you are not connecting the detection cable or the Tracetek network immediately, close and lock the enclosure door.
Detection Cable Connection
If the TTDM is used to monitor a detector directly, follow these instructions to connect the detector to the TTDM. If the TTDM is used as a master for a network, refer to "Tracetek Network Connection".
Detection Cable Preparation: Ensure the detection cable has been installed and tested according to the instructions provided with the cable.
Connections:
- Verify the unit is powered off.
- Open the enclosure door.
- Feed the Tracetek modular connection cable (or link cable) through the gland plate (labeled 'br') into the enclosure.
- Remove the detector cable plug (labeled 'cn') from the detector interface card socket (labeled '9').
- Connect the four colored wires to the detector interface plug. Important: Respect the colors. If wires are not connected to the corresponding terminals, the leak detection system cannot function correctly.
- Reinsert the detector cable plug into the detector interface card socket (labeled '9').
Detection Cable Wiring
Diagram shows the detection cable wiring. PL is indicated. Terminal connections are shown for RED, GRN, YEL, BLK wires, corresponding to terminals 33, 34, 35, 36.
Zener Barrier Installation, if applicable:
If the detection cable must be installed in a hazardous zone classified as Class 1, Division 1 (Zone 0 or 1 in Europe), approved organizations require the detection cable to be protected by a Zener barrier between the detection cable and the TTDM unit. Contact Tracetek to select an appropriate barrier. When installing a Zener barrier, connect it according to the accompanying instructions.
Zener Barrier Installation Diagram
Diagram illustrates the setup: "Ordinary Zone" contains the TTDM unit and a "connection or jumper cable". "Hazardous Zone (Zone 0 or 1 in Europe)" contains a "Zener Barrier" connected to the "Detection Cable".
Tracetek Network Connection
If the TTDM is used as a master in a Tracetek network, follow these instructions for communication wiring. NOTE: Some Tracetek network configurations may require a different type of communication wiring. Please refer to the TTDM-128 user manual for more details.
Communication Cable Preparation: Ensure the communication cable has been installed and tested.
Interface Connections (RS-485):
Verify the unit is powered off. Open the enclosure door. Feed the communication cable through the gland plate (labeled 'br') into the enclosure. Remove the J10 cable plug from its 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 socket (labeled 'bq'). IMPORTANT: Respect polarity. If wires are not connected to the corresponding terminals, the leak detection system cannot function correctly. Insert the J10 cable plug into its socket (labeled '24').
RS-485 Interface Wiring Diagram
Diagram shows RS-485 interface wiring. It indicates PL, a socket labeled '24' (RS-485 EXT XMTRS), a socket labeled '16' (ground), and the J10 cable plug. Connections are shown for Shield, RS-485 (-), and RS-485 (+), leading to "Câble RS-485 vers le module TraceTek suivant" (RS-485 Cable to the next Tracetek module).
Host Computer Connection
There are three ways to connect the TTDM to a host computer: permanent RS-232 wiring, permanent RS-485 wiring, or a standard modular RS-232 cable. For permanent installation, permanent wiring is recommended (RS-232 or RS-485 as applicable). The modular RS-232 cable should only be used for temporary connections by qualified technicians.
Interface Connections (RS-232):
Verify the unit is powered off. Open the enclosure door. Feed the communication cable through the gland plate (labeled 'br') into the enclosure. Remove the J10 cable plug from its socket. Connect the RX wire to terminal 5, TX to 6, RTS to 7, CTS to 8, and DGND to terminal 10. Set the host port selector (labeled 'cq') on the user interface card (labeled '7') to the RS-232 position.
Interface Connections (RS-485):
Verify the unit is powered off. Open the enclosure door. Feed the communication cable through the gland plate (labeled 'br') into the enclosure. Remove the J10 cable plug from its socket. Connect the positive wire to terminal 5 (RX/A) and the negative wire to terminal 6 (TX/B). Set the host port selector (labeled 'cq') on the user interface card (labeled '7') to the RS-485 position. Connect the shield wire to the round socket (labeled 'bq'). Insert the J13 cable plug into its socket (labeled '22').
RS-232 and RS-485 Interface Wiring Diagrams
Diagrams show wiring for RS-232 and RS-485 interfaces. For RS-232, connections are shown for Blindage, DGND, CTS, RTS, TX, RX to a cable labeled "Câble RS-232". For RS-485, connections are shown for Blindage, RS-485 (-), RS-485 (+) to a cable labeled "Câble RS-485". Both diagrams reference sockets labeled '26' and '16' (ground).
System Startup and Test
System Launch:
Once connections are complete, apply power to the unit. It will perform a series of self-diagnostics and then display the system status. If the detection circuit is ready and free of leaks or other issues, only the green control diode will light up, and the display will show as illustrated.
System Normal Display
Diagram shows the display status "CH01 System normal" with time and date.
If this is not the case, you can obtain more information in the TTDM user and maintenance manual provided with the unit.
Commissioning:
The commissioning of your system is the responsibility of an authorized Tracetek representative. The site plan is an important part of the Tracetek location system. The TTDM indicates the location on the detection cable where a leak has been detected. The plan is essential for indicating the physical location.
IMPORTANT: Keep the material and documentation accompanying the TTDM in a safe place for future use (commissioning, interface connections, operation).
