Product Details
The Honeywell 621-9933C, also cataloged as the 621-9933 Power Supply Module, operates as a dedicated hardware component for converting line AC power to regulated internal backplane DC voltages within Honeywell IPC 620 processor racks.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 621-9933C |
| Brand | Honeywell |
| Origin | USA |
| Weight | 5.40 lbs (2.45 kg) |
| Dimensions | Standard IPC 620 processor rack slot width |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | Input: 115/230 VAC (47-63 Hz) |
| Module Type | Processor Rack Power Supply |
| Output Current Rating | 2 to 15 A (Backplane secondary output bus) |
| Input Line Voltage | 115/230 VAC selectable switch/terminal |
4-20 mA HART Loop Protocol and Channel Isolation
The 621-9933C power supply module delivers regulated internal secondary power to the backplane bus, driving active processor modules and adjacent analog I/O cards. High galvanic channel-to-channel isolation between primary AC power lines and backplane logic circuits prevents line noise from coupling into analog measurement channels processing 4-20 mA HART loop protocol signals. This isolation barrier prevents ground loop currents from destabilizing high-density process I/O sub-networks.
Frequently Asked Questions
Q: Does replacing the 621-9933C power supply module require powering down the processor rack?
A: Yes. The 621-9933C directly feeds the primary rack backplane bus; power must be completely isolated before extracting or inserting the supply module to prevent backplane bus transients.
Q: How is the input operating voltage changed between 115 VAC and 230 VAC?
A: Line voltage selection is configured via the physical jumper or selector terminal block located on the unit frame before primary AC power application.
Field Installation Guidelines
- Turn off all incoming 115/230 VAC main power feeds to the control cabinet before servicing the power supply slot.
- Confirm that the voltage select terminal or jumper on the 621-9933C matches the local AC power system supply (115 VAC or 230 VAC, 47-63 Hz).
- Align the module card edges with the leftmost power slot guide rails of the Honeywell IPC 620 processor rack.
- Slide the module in firmly until the backplane power connectors fully seat, then secure top and bottom retaining screws.
- Connect AC line, neutral, and heavy-gauge protective earth ground wires to the terminal block, ensuring ground resistance remains under 1 Ohm.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
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