Product Details
Configured for internal DC voltage regulation and power distribution in IPC 620 systems, the Honeywell 621-9934C (621-9934 Power Supply Board) provides direct physical/electrical execution. The assembly converts an incoming AC supply voltage of 115 VAC or 230 VAC into a regulated 24 VDC bus output to drive logic managers and adjacent I/O cards across the rack backplane. Weighing approximately 1.45 kg, the module incorporates internal overload protection circuits and ripple filtering stages to enforce steady-state voltage delivery within industrial control racks.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 621-9934C |
| Brand | Honeywell |
| Origin | USA |
| Weight | 1.45 kg (3.20 lbs) |
| Dimensions | 264 mm x 32 mm x 127 mm |
| Operating Temp | 0 to +60 deg C |
| Power Consumption | Power supply module (regulated 24 VDC output) |
| Input Voltage | 115 VAC or 230 VAC |
| Output Voltage | Regulated 24 VDC |
| Protection Features | Low ripple output and overcurrent overload protection |
| System Compatibility | Honeywell IPC 620 / Universal Control Network (UCN) |
4-20 mA HART Loop Protocol & Channel-to-Channel Isolation
The 621-9934C utilizes isolated transformer topology and output filtering networks to decouple high-voltage AC mains from internal DC logic rails. When providing 24 VDC power to analog I/O modules processing 4-20 mA HART loop protocol signals, the assembly maintains tight output regulation and suppresses high-frequency power supply noise. This filtering preserves channel-to-channel isolation parameters on field I/O channels, preventing power rail noise from inducing measurement shifts in analog input registers.
Frequently Asked Questions
Q: How is the input voltage selection between 115 VAC and 230 VAC configured on the 621-9934C circuit board?
A: Input voltage selection is established via hardware terminal wiring jumpers or on-board voltage selection pins prior to applying AC mains power.
Q: Can the 621-9934C power supply board be removed from the rack while main AC power is applied?
A: No, AC mains supply must be disconnected and de-energized before removing or installing the power supply card to prevent arc flash and equipment damage.
Field Installation Guidelines
- De-energize and lock out main AC input power lines leading to the IPC 620 control rack.
- Verify that the AC input voltage jumper configuration on the board matches the local 115 VAC or 230 VAC supply level.
- Slide the 621-9934C printed circuit board smoothly into its dedicated rack slot along the guide rails until edge connectors seat completely into the backplane socket.
- Tighten front panel retaining screws to secure the module and maintain chassis earth ground continuity before applying power.
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.
Tech & Buying Guide
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