HIMA K9203A 996920360 Rack fan

The HIMA K9203A (part number 996920360) is an Accessory Rack Fan designed for the forced ventilation of 19-inch rack installations, specifically for HIQuad (H51q) and HIMax safety systems.

While safety controllers process the logic, 

the K9203A ensures that the high integration of electronic components does not lead to overheating, which is critical for maintaining the long-term reliability and "SIL" rating of the system.

Key Technical Specifications

Monitoring and Status Indicators

The K9203A is not just a "simple" fan; it includes built-in safety monitoring for the rack's environment:

Fan Operation Monitoring: It monitors the speed of the three axial fans. If the speed drops below 75–85% of the rated speed, a failure is triggered.

Voltage Monitoring: It monitors the incoming $24text{ V}$ power.

Redundant Power Supply: It has terminals for a second $24text{ V}$ feed (Terminal 3) to ensure cooling continues even if one power source fails.

LED Indicators:

24 V (Green): On when power is correct; blinking if voltage is out of range ($< 20.4text{ V}$ or $> 28.8text{ V}$).

Fail (Red): On if a fan malfunction is detected.

Connector Pinout (6-Pin Plug)

The module uses a spring-cage terminal connector for easy wiring:

Pin 1 & 2: Primary $24text{ V DC}$ Supply ($L1+$, $L-$).

Pin 3: Redundant $24text{ V DC}$ Supply ($L2+$).

Pin 4. 5. 6: Fault Signaling (Relay contacts).

Normal: 4-5 Open / 5-6 Closed.

Fault/Power Loss: 4-5 Closed / 5-6 Open.

Maintenance Note

The axial fans have a calculated lifetime of 62.500 hours (about 7 years) at $40^circtext{C}$. 

If your system is approaching this age, or if the "Fail" LED is lit, the internal fan motors are likely reaching their end-of-life and the entire K9203A unit should be replaced to prevent safety controller shutdowns due to over-temperature.