Westinghouse 7379A91G02 Analog Input Modules

The Westinghouse 7379A91G02, also cataloged as the 7379A91G02 QAA Card, operates as a dedicated hardware component for analog input signal conditioning and process loop monitoring within Westinghouse Q-Line automation platforms.

Hardware Specifications

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

The Westinghouse 7379A91G02 card conditions high-accuracy analog signals originating from field transmitters utilizing the 4-20 mA HART loop protocol. Onboard analog-to-digital conversion stages process current loop signals with continuous filtering, providing accurate process variable representation while allowing digital HART frequency-shift keying (FSK) signals to pass through to supervisory management nodes.

To protect internal system buses and avoid earth potential loops across distributed instrumentation loops, the card features robust channel-to-channel isolation. This galvanic separation isolates field transmitter wiring from backplane logic power, preventing common-mode voltage spikes and ground currents from interfering with adjacent channel measurements.

Frequently Asked Questions

Q: Does the 7379A91G02 module support hot-swapping inside a live Q-Line rack?

A: No, power to the local Q-Line card cage segment must be isolated prior to pulling or inserting the card to prevent backplane edge connector damage and bus disturbance.

Q: How is channel isolation verified on the field terminal block?

A: Galvanic channel isolation is built into the card's input circuitry; field connections must strictly follow the channel terminal pinout diagrams without cross-wiring common return leads.

Field Installation Guidelines

1. Power down the designated Q-Line subrack slot before inserting the module assembly.
2. Align the board edges with the card cage guide tracks, sliding the card inward until the rear edge connector seats fully into the backplane socket.
3. Tighten the top and bottom front panel retaining screws to secure the module and complete ground bonding with the chassis.
4. Route field 4-20 mA wiring in shielded twisted-pair cables, grounding the shield drain at the dedicated terminal enclosure bus bar only.