Westinghouse 4D33900G19 Power Supply Module

Configured for internal direct current regulation and auxiliary voltage distribution in Emerson Westinghouse Ovation DCS platforms, the Emerson 4D33900G19 (4D33900G19 Power Supply) provides direct physical/electrical execution.

Hardware Specifications

4-20 mA HART Loop Protocol and Channel-to-Channel Isolation

The module incorporates primary-to-secondary galvanic isolation filtering to insulate downstream Ovation I/O modules from power line transients and AC line spikes. High-frequency suppression circuitry ensures low output ripple across dual 24 VDC supply rails, maintaining voltage stability under shifting load conditions. Internal isolation barriers prevent ground potential loops from corrupting sensitive analog circuitry, preserving continuous signal integrity across field-side 4-20 mA HART loop protocol transmitters.

Frequently Asked Questions

Q: What are the primary installation considerations when replacing the 4D33900G19 module in a live cabinet chassis?

A: Ensure AC line input power is completely de-energized before extracting the assembly. Verify that terminal block retention screws are disengaged to prevent mechanical strain on internal power connectors or chassis mounting brackets.

Q: How are dual 24 VDC power outputs isolated within the unit?

A: Output 1 and Output 2 feature independent voltage regulation and isolation circuitry to prevent short-circuit faults on one branch from causing power collapse on the auxiliary supply bus.

Field Installation Guidelines

Mount the power supply unit vertically onto the designated enclosure chassis rails. Slide the unit backward until the rear power bus alignment connectors seat fully into the chassis frame assembly. Fasten all front panel retaining screws to a torque of 1.2 Nm to guarantee continuous mechanical grounding and structural stability.

Primary AC input cables (85-264 VAC) must be routed in dedicated high-voltage wireways, maintaining a minimum physical clearance of 300 mm from low-voltage instrument signal lines. Ground the chassis frame to the main enclosure earth bus via the dedicated protective ground stud before energizing primary line voltage.