Key Technical Specifications
| Parameter | Specification |
|---|---|
| Module Type | 32-Point 24VDC Supervised Digital Output, TMR |
| Nominal Voltage | 24VDC |
| Operating Voltage Range | 16–32VDC (max 36VDC) |
| Output Channels | 32, common-point configuration |
| Rated Current per Point | 1.7A continuous |
| Inrush Current | 7A per point, 10ms max |
| Voltage Drop | < 2.8VDC @ 1.7A typical |
| Minimum Load | 10mA |
| Load Leakage | 4mA max |
| Point Isolation | 1500VDC |
| Module Power Dissipation | < 13W |
| Safety Rating | IEC 61508 SIL3 (TMR, no single-point failure) |
| Operating Temperature | -20°C to +50°C |
| Storage Temperature | -40°C to +70°C |
| Humidity | 5–95% RH, non-condensing |
| Compatible Racks | Tricon V9 / V10 / V11 with 3009 processor |
| Hot-Swap | Supported |
| Diagnostics | Per-channel status, module PASS/FAULT/LOAD/ACTIVE, field alarm |
Product Introduction
If you have ever chased a stuck solenoid on a compressor ESD rack at 2 AM, you know why the 3625C1 exists. This is a TRICONEX Tricon 3600-series 32-point 24VDC supervised digital output module. It sits in a Tricon V9/V10/V11 rack, takes trip commands from the 3009 main processor over the TriBus backplane, and drives field devices — emergency shutdown solenoids, safety relays, alarm horns, trip valves. The three independent output channels vote in hardware, so one bad transistor or one noisy field return does not bring the unit down.Engineers keep this card in spares inventory because it does two things at once: it drives 32 points at 1.7A each, and it can supervise the load回路 for open circuits and stuck-on/stuck-off conditions. That supervision matters when a failed solenoid coil is the difference between a safe shutdown and a no-trip event. The module runs from 16–32VDC, supports hot-swap, and carries IEC 61508 SIL3 certification through its TMR architecture. One caveat: the 3625C1 must be paired with the correct external terminal panel (ETP) and cable assembly. The module itself does not terminate field wiring directly.
Quality SOP & Tech Pitfalls
The Lab Report (SOP):
- Visual & counterfeit check — inspect PCB, connector pins, label revision (3625C1), and ETP cable interface for corrosion or rework.
- Live test on Tricon test rack — seat module, verify PASS/FAULT LEDs, confirm TriBus communication with 3009 processor.
- Channel output test — step each output on/off under resistive load; measure voltage drop (< 2.8VDC @ 1.7A typical).
- Supervision diagnostic test — simulate open load and stuck-on conditions; verify field alarm and channel diagnostics.
- Insulation check — verify 1500VDC point isolation integrity with a megohmmeter.
- Firmware/revision logging — record module revision (e.g., Rev E5) and compare against existing rack population.
- Anti-static sealing — bag, tag, and ship in ESD packaging with test report.
The Engineer’s Warning (Pitfalls):
- Do not confuse 3625C1 with 3624, 3664, or 3625A. The 3624 is 16-point DO. The 3664 is a newer DO architecture that is not a direct mechanical/electrical drop-in on older V10 racks. The 3625A is an analog input module — entirely different function. Swapping these without checking the rack slot definition will give you a silent mismatch or a hard fault.
- Supervision mode is a configuration trap. If the old module ran in supervised mode and the replacement is loaded with an unsupervised point map (or vice versa), the logic may not behave as expected during a trip test. I have seen a plant spend six hours chasing a “bad module” that was actually a TriStation point configuration mismatch. Always export the current point database before pulling the card.
- ESD kills these modules. The 1500VDC point isolation is real, but the front-end electronics are not immune to a careless wrist strap or a live field short during swap. Ground yourself. Disconnect field power before touching terminals.
Installation & Configuration Guide
1. Pre-Installation ⚠️
- Obtain a work permit and notify operations. This is a safety system module — do not bypass interlocks.
- Verify the replacement is labeled 3625C1, not 3624/3664/3625A.
- Photograph the existing module: revision label, LED states, slot number, ETP cable orientation, and TriStation point configuration.
- Export the current TriStation 1131 configuration and note which points are set to supervised vs. unsupervised mode.
2. Removal
- Identify the faulty module slot in the Tricon rack.
- Label the ETP cable and any adjacent modules.
- Release the retractable fasteners (torque spec: 10 in-lb when re-installing — the OEM label calls this out explicitly).
- Slide the module out carefully. Do not tug the ETP cable.
3. Installation
- Copy all DIP/jumper/revision details from the old module. On Tricon I/O, the “configuration” lives in TriStation, but the physical revision and ETP cable type must match.
- Seat the 3625C1 firmly into the slot. Tighten fasteners to 10 in-lb — under-torqued fasteners cause intermittent backplane contact.
- Reconnect the ETP cable. Verify it is the correct cable for a 32-point DO module.
4. Power-On & Testing
- Verify rack 24VDC supply is within 16–32VDC.
- Observe LED boot sequence: PASS should illuminate; FAULT should clear.
- Download/verify the TriStation point configuration. Confirm supervised/unsupervised settings match the original.
- Perform a partial stroke or loop check on a non-critical output first. Then validate all 32 points during the next scheduled trip test.
Compatible Replacement Models
| Tier | Model | Notes |
|---|---|---|
| ✅ Drop-in Replacement | TRICONEX 3625C1 (same revision) | Direct swap in Tricon V9/V10/V11 racks. Match revision where possible. |
| ✅ Drop-in Replacement | TRICONEX 3625 (non-C1 revision) | Same 32-point 24VDC supervised DO family. Verify revision compatibility in TriStation before installing. |
| ⚠️ Software Compatible | TRICONEX 3664 | Newer DO architecture. May require firmware updates, slot redefinition, and ETP cable changes. Not a mechanical drop-in on all V10 racks. |
| ❌ Hardware Mod Required | TRICONEX 3624 | 16-point DO. Half the channel count. Not a functional replacement for a 32-point application. |
| ❌ Wrong Function | TRICONEX 3625A | Analog input module. Completely different function. Do not substitute. |
Frequently Asked Questions (FAQ)
Can I hot-swap the 3625C1 without tripping the unit?
Yes. The Tricon TMR architecture supports hot-swap. One channel can be removed while the other two continue voting. That said, I still recommend doing it under a controlled work permit and with operations aware. “Supported” does not mean “risk-free” if the remaining channels are already degraded.Is the 3625C1 the same as the 3625?
They are in the same family. The 3625C1 is a specific revision of the 32-point 24VDC supervised DO module. Always check the revision label and confirm in TriStation before installing a different revision. Some revisions carry firmware or diagnostic differences.Can I use the 3625C1 in a Tricon CX rack?
No. The 3625C1 belongs to the legacy Tricon V9/V10/V11 platform with the 3009 processor. Tricon CX uses a different I/O architecture. If you are migrating to CX, you need the CX-equivalent DO module, not a 3625C1.What happens if I install it without the ETP?
It will not work. The 3625C1 does not terminate field wiring directly. It requires the correct external terminal panel and cable assembly. Wrong ETP = wrong pinout = miswired outputs.How do I know if supervision is enabled?
Check the TriStation 1131 configuration for each point. Supervised mode enables open-load and stuck-on/stuck-off diagnostics. If you replace a supervised module with one configured as unsupervised (or vice versa), the diagnostic behavior changes even though the output may still switch.What is the per-point current limit?
1.7A continuous per point, with a 7A inrush for up to 10ms. If you are driving large solenoid banks, verify the inrush does not exceed the module spec. I have seen field fuses on the ETP blow because someone paralleled too many solenoids on one point.Does it come with a warranty?
New original surplus units typically carry a 12-month warranty against non-human damage. Refurbished or pulled units vary by supplier. Always confirm warranty terms and request a pre-shipment test report before paying.
