Honeywell 621-9933 (6219933) Product Description

621-9933 (6219933) is a high-power power module for the I/O rack of the Honeywell 621 series, specially designed for IPC 620/621, UCN, TDC 3000, TPS and other DCS systems. It provides dual 5V + and 15V + output with high current, meeting the high power consumption requirements of high-density and fully-configured I/O racks. 

I. Basic Information

Brand: Honeywell (Honeywell / ISSC)

Full Model: 621-9933 (6219933)

Series: 621 Series I/O Rack Power Supply

Type: High-power Rack-mounted Switching Power Supply (Dual-slot Width)

Production Status: Out of Production (Obsolete)

Weight: Approximately 1.5 kg

Dimensions: Approximately 26.5 × 13.2 × 5.6 cm (Dual-slot Width)

Installation: Plug-in into the dedicated power slot of the 621 Series I/O Rack

Common Suffixes:

621-9933C: Enhanced, Long-life, High-reliability Version

621-9933-RP: Refurbished / Repaired Version

II. Core Functions

Dual-channel High-power Output: +5V/15A (Digital Logic), +15V/2A (Analog / Drive)

Wide Voltage Input: 115/230V AC automatic recognition, compatible with global power grids

High-density Power Supply: Supports all modules of the fully configured 14-slot I/O Rack

Comprehensive Protection: Overvoltage, Overcurrent, Short Circuit, Overheat, Surge Full Protection

Hot Swap Compatibility: Supports online replacement, without interrupting system operation

Redundancy Support: Can be combined with 621-9932 to achieve 1+1 Redundancy

Status Monitoring: LED real-time indication, supports remote system diagnosis

III. Electrical Specifications

Input Voltage: 115/230V AC (±15%), 47-63 Hz (Automatic Switching)

Input Current: 8A @ 115V AC; 4A @ 230V AC

Output 1 (Digital): +5V DC / 15A (maximum)

Output 2 (Analog): +15V DC / 2A (maximum)

Output accuracy: ±1% (full load, full temperature range)

Ripple noise: < 60mV p-p (5V); < 120mV p-p (15V)

Efficiency: ≥ 85% (typical load)

Isolation voltage: 1500V AC RMS (input - output - ground)

Cooling method: Natural air cooling (heat sink)

IV. Environmental parameters

Operating temperature: 0°C ~ +60°C

Storage temperature: -40°C ~ +85°C

Humidity: 5–95% RH (no condensation)

Vibration resistance: 5–500 Hz, 2 g (IEC 60068-2-6)

Impact resistance: 15 g, 11 ms (IEC 60068-2-27)

Protection: IP20 (installed in cabinet)

Certifications: CE, UL, CSA, 94V-0 flame retardant

VII. Status indication (LED)

PWR (green): Input normal, power supply working

5V (green): +5V output normal

15V (green): +15V output normal

FAULT (red): Overvoltage / Overcurrent / Overheat / Output fault

OVERTEMP (yellow): Module overheating warning

VI. Typical applications

High-density I/O rack main power supply (14 slots full configuration)

UCN remote I/O station high-power supply

TDC 3000 / TPS system high-power circuit

Analog AI/AO module centralized power supply

Expansion of old system, upgrade of high-load I/O station

VIII. Model comparison (621 series power supply) Table

Parameters 621-9933 621-9931 621-9934C

Output +5V/15A; +15V/2A +5V/8A; ±15V/0.6A +5V/10A; ±15V/1A

Width Dual-slot Single-slot Single-slot

Redundancy Supported (requires 9932) Supported Supported

Hot-swapping Supported Supported Supported

Status 停产 停产 In production

VIII. Common Faults and Troubleshooting

FAULT Red light + OVERTEMP Yellow light

Reason： High environmental temperature， poor heat dissipation， overload

Troubleshooting： Improve ventilation → Reduce environmental temperature → Reduce load → Replace module

5V light does not light up (15V is normal)

Reason： +5V output short circuit， overload， internal voltage regulation failure

Troubleshooting： Disconnect load → Reset → Check I/O module → Replace power supply

Input is normal but no output

Reason： Input fuse blown， internal circuit failure， backplane contact不良

Troubleshooting： Check input fuse → Reinsert firmly → Replace power module

IX. Related Models

Replacement / Upgrade Model： 621-9934C (recommended)

Redundancy Management Module： 621-9932

Standard Single-slot Power Supply： 621-9931

Controller Power Supply： 621-9920 / 621-9921

I/O Rack： 621-7000 (14 slots) / 621-7010 (10 slots)