Honeywell 51304638-175 MC-GOAX02 Analog Output Galvanic Isolator Assembly

The Honeywell 51304638-175, also cataloged as the MC-GOAX02 Analog Output Galvanic Isolator Assembly, operates as a dedicated hardware component for isolated signal conversion and ground loop elimination within Experion PKS, TPS/TDC 3000, and FSC platform environments. It converts digital control commands into 2 isolated 4-20 mA or 0-10 VDC output loops to drive actuators and control valves with ±0.1% full-scale accuracy.

Hardware Specifications

Channel-to-Channel Isolation & Galvanic Protection

The MC-GOAX02 (51304638-175) incorporates full transformer-based galvanic isolation across both individual output channels and between the field-side wiring and internal system buses. This physical barrier blocks common-mode voltage spikes, preventing stray ground potentials from corrupting control logic. The isolated output stage delivers clean analog signals across active 4-20 mA HART loop protocol networks, safeguarding controller backplane components during field cable short circuits or electrical fault conditions.

Frequently Asked Questions

Q: Can individual channels on the MC-GOAX02 be hot-swapped or reconfigured without disrupting the adjacent channel?

A: Module replacement must follow system rack de-energization or IOTA isolation procedures, while output signal selection (4-20 mA or 0-10 VDC) requires configuring dedicated module terminals or firmware setup.

Q: How does the galvanic isolation circuit prevent ground loop degradation in analog control valves?

A: By breaking the direct physical earth connection between field actuator loops and system power supplies, the assembly blocks ground loop current paths that introduce offset errors into the 4-20 mA drive signal.

Field Installation Guidelines

1. Mount the module securely onto the designated cabinet DIN rail or cabinet-integrated IOTA base to establish proper mechanical retaining force.
2. Verify 24 VDC main power supply polarity before applying power to prevent internal reversed-polarity protective fuse tripping.
3. Route field wiring for 4-20 mA loops using twisted-shielded pair cables, terminating shields at a single chassis grounding point.
4. Maintain separation between low-voltage analog signal cables and high-voltage AC power conductors within panel wire raceways.