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TTDM Series
Leak Detection and Location Modules Replacement
Parts Installation Instructions
TRACETEK TTDM REPLACEMENT PARTS
Catalog number
Description
TTDM-4/20
TTDM 4-20 mA current transmitter board
TTDM-SI
TTDM Sensor Interface board
TTDM-Relay
TTDM relay
TTDM-PS1
TTDM power supply board, 115 Vac
TTDM-PS2
TTDM power supply board, 230 Vac
TTDM-PS24
TTDM power supply board, 24 Vdc
TTDM-fuse
200 mA, 250 V, quick-acting microfuses for TTDM-PS (bag of 5)
TTDM-MB
TTDM motherboard
TTDM-RC1
TTDM ribbon cable, 6 inches long, with connectors installed
TTDM-UI
TTDM User Interface assembly
TTDM-UI-EPROM-x
TTDM-UI EPROM replacement; upgrades User Interface software to version indicated by x suffix. For new
features, see TTDM Software Release Bulletin H55874; instructions for replacing the EPROM are covered
in a separate document (H55875) shipped with the EPROM.
GENERAL INFORMATION
These instructions detail the steps to replace parts in the nVent
RAYCHEM TraceTek TTDM series leak detection and location
modules (catalog numbers TTDM, TTDM-NMM, and TTDM-SIM).
The modular design of the TTDM makes it possible to replace
individual boards—rather than the entire unit—if part of the module
is damaged or malfunctioning. These instructions explain how to
install the replacement parts detailed below, except for the TTDM-
UI-EPROM. Instructions for replacing the EPROM are covered in a
separate document (H55875) which is shipped with the EPROM.
These instructions for replacing parts are complemented by
instructions for installing the modules (document H55471 for
the TTDM and TTDM-NMM; H56314 for the TTDM-SIM).
The TTDM is an electronic unit. Its circuit boards should be
replaced only by a person qualified for work on electronic
instrumentation and controls.
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Summary of Contents for nvent RAYCHEM TraceTek TTDM Series
- Page 1 Leak Detection and Location Modules Replacement Parts Installation Instructions GENERAL INFORMATION These instructions detail the steps to replace parts in the nVent RAYCHEM TraceTek TTDM series leak detection and location modules (catalog numbers TTDM, TTDM-NMM, and TTDM-SIM). The modular design of the TTDM makes it possible to replace individual boards—rather than the entire unit—if part of the module...
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Page 2: Tools Required
Top view of 4-20 mA board 4-20 mA board with their mating connectors on the motherboard Connectors 2 | nVent.com... - Page 3 2. Install new relay. Carefully align leads from the relay with the sockets on motherboard, then insert the relay leads into motherboard. Rotate hold-down spring back into position to retain the relay in place Hold-down spring rotated to release relay nVent.com | 3...
- Page 4 Note: In the TTDM-PS24 board (which operates at 24 Vdc or Vac), the terminal block for the power supply wires is in the center of the board, rather than at the lower right. For DC operation, polarity does not matter. 4 | nVent.com...
- Page 5 UI assembly until the locking ears latch in place. Figure 3 RS-485 EXT XMTRS RS-232/485 EXT COM PORT 4-20mA OUT PORT +51SO ICOM 485+ 485– RX/A TX/B RTS CTS +5V GND IRNT IOUT nVent.com | 5...
- Page 6 Figure 2 in Section E (page 5). Reconnect the power supply wires to the two-pin terminal block on the power supply board. Use L2 for neutral, if present (however, if using TTDM-24 at 24 Vdc, polarity does not matter). 6 | nVent.com...
- Page 7 Place the two spacer gaskets (of fiber construction resembling paper) in position around the eight Fiber gasket spacers (2) mounting studs (see Figure 4). • Place the foam sealing gasket in position inside the eight mounting studs. nVent.com | 7...
- Page 8 ©2018 nVent. All nVent marks and logos are owned or licensed by nVent Services GmbH or its affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change specifications without notice. RaychemTraceTek-IM-H56348-TTDMSeries-EN-1805...
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