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Phone: +86 16626708626Description
3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Output Channels | 8 |
| Output Signal | Galvanically isolated 4-20 mA |
| Maximum Load Resistance | < 750 Ω |
| Isolation | Channel-to-system and channel-to-channel galvanic |
| Terminal Type | Compression terminals |
| Redundancy Support | Not supported |
| Conformal Coating | Yes |
| Compliance | CE |
| Form Factor | Size B (approx. 307 mm / 12.1 in) |
| System Compatibility | Honeywell TDC 3000, Experion PKS, Process Manager |
| Operating Temperature | Typically −25 °C to +60 °C |
| Weight | approx. 0.9 kg |
4. Product Introduction
The Honeywell MC-GOAX02 (part number 51304638-175) is an 8-channel Analog Output Field Termination Assembly (FTA) designed for galvanically isolated 4-20 mA outputs. It sits between the system Analog Output processor and field devices such as control valves, positioners, and actuators in Honeywell TDC 3000 and Experion PKS installations.
The unit provides full galvanic isolation to eliminate ground loops and protect the controller from field-side faults. Conformal coating and CE compliance make it suitable for corrosive or humid process environments. Compression terminals secure field wiring, and the Size B form factor fits standard Honeywell FTA mounting channels. Redundancy is not supported on this model.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No output current on channel(s) | Open field loop or wiring fault | ✅ High | Measure loop resistance and 4-20 mA at terminals | Verify field wiring and device load <750 Ω |
| Output stuck at 0 or 20 mA | FTA channel failure or processor fault | ✅ Medium | Force known value from controller; measure actual mA | Swap to known-good channel or replace FTA |
| Ground loop / noisy signal | Missing or failed isolation | ✅ High | Check isolation integrity and common-mode voltage | Confirm proper grounding; replace FTA if isolation lost |
| Multiple channels failed | Power or backplane issue | ❌ Low | Check 24 V supply and FTA power LEDs | Inspect power distribution before replacing FTA |
| Intermittent output | Loose compression terminal | ✅ Medium | Inspect and re-torque field terminals | Re-seat and re-torque connections |
If the fault remains after these checks, provide clear photos of the FTA label, terminal wiring, and any diagnostic messages from the system to technical support.
MC-GOAX02 51304638-175
MC-GOAX02 51304638-175
6. Frequently Asked Questions (FAQ)
Q: How many channels does the MC-GOAX02 provide?
A: Eight independent galvanically isolated 4-20 mA analog output channels.
Q: Does this FTA support redundancy?
A: No. The 51304638-175 is a non-redundant assembly. Redundant configurations require different FTA models.
Q: What is the maximum load resistance?
A: Less than 750 Ω per channel. Exceeding this value prevents the loop from reaching full 20 mA.
Q: Is this unit compatible with Experion PKS and legacy TDC 3000?
A: Yes. It is designed for Honeywell Process Manager, TDC 3000, and Experion PKS systems that use Size B FTAs.
Q: What does the conformal coating provide?
A: Protection against moisture, dust, and corrosive atmospheres commonly found in process plants. The “MC” prefix indicates the coated version.
Q: Can I hot-swap this FTA?
A: Follow Honeywell procedures for the specific system. In most cases the associated AO processor should be taken offline or the loop forced to a safe state before removing the FTA.
Q: Do you supply test documentation?
A: Yes. Units are verified for channel output accuracy, isolation integrity, and terminal continuity. Test reports and photos are available on request.
