New 4715KL-05W-B39 NMB-MAT Cooling Fan 24vdc 0.40A

4715KL-05W-B39 | NMB Minebea 24V DC Cooling Fan — 119mm / 108 CFM / 2950 RPM / Ball Bearing / 3-Wire Alarm / FANUC CNC

NMB 24V DC Industrial Fan with Locked Rotor Alarm Signal

The 4715KL-05W-B39 is a 24V DC axial cooling fan from NMB Technologies — a 119mm industrial fan delivering 108 CFM airflow at 2950 RPM with a third-wire locked rotor alarm signal. This is not a simple 2-wire fan: the alarm signal wire allows the host system to detect fan failure and generate a fault before the equipment it is cooling reaches critical temperature.

The 24V DC supply matches industrial control cabinet power distribution — the same 24V supply used for PLCs, sensors, and control electronics, eliminating the need for a dedicated supply voltage for the cooling fan.

Key Specifications

3-Wire Alarm Signal — Fan Failure Detection

The third wire of the 4715KL-05W-B39 provides a locked rotor alarm signal — the feature that distinguishes this fan from basic 2-wire cooling fans:

How it works: The alarm signal wire outputs a logic signal (typically open-collector) that pulses at a frequency proportional to fan speed. When the fan's speed drops below approximately 50% of rated speed (due to bearing failure, bearing seized condition, or blocked airflow), the controller detects the signal change and can generate a system fault or warning.

Early failure detection: Bearing failure in fans typically progresses gradually — initial bearing wear causes speed reduction before complete failure. The 3-wire alarm allows the system controller to detect this degradation and trigger a maintenance alert before catastrophic fan failure causes system overtemperature.

FANUC CNC integration: FANUC CNC controls and servo drive modules with the FANUC A90L-0001-0509 fan reference use the alarm signal output to generate fan fault alarms — alerting operators to schedule maintenance before heat-related damage occurs.

Applications

FANUC CNC and servo drive cooling: Fan replacement in FANUC control cabinets referencing A90L-0001-0509 — servo amplifiers, axis control modules, and CNC processor assemblies cooled by 24V DC fans with alarm signal monitoring.

Industrial drive and inverter enclosures: 24V-powered cooling fans in VFD cabinets, servo amplifier enclosures, and automation control panels requiring alarm-monitored cooling.

Server and telecom equipment: High-performance network equipment and server chassis requiring continuous-duty 24V DC fans with locked rotor detection.

Industrial automation controllers: PLC cabinets, SCADA hardware, and industrial computer systems requiring monitored cooling.

FAQ

Q1: What does the alarm signal output of 4715KL-05W-B39 connect to?

The alarm signal connects to a digital input on the drive or controller — the input monitors the fan pulse output. FANUC amplifiers with the A90L-0001-0509 fan reference have a dedicated fan alarm input that reads the 3rd wire signal. If the pulse frequency drops below the threshold indicating fan failure, the drive generates a fan alarm code. In systems without a dedicated fan alarm input, a separate fan monitoring circuit (counter or frequency-to-voltage converter) can process the signal.

Q2: Can 4715KL-05W-B39 be used as a 2-wire fan by leaving the alarm wire disconnected?

Yes — the fan will operate normally with only the V+ and V− wires connected. The third wire can be left unconnected (floating) without affecting the fan's motor operation. However, disconnecting the alarm wire eliminates the fan failure detection capability — a failed fan will not generate an alarm, and equipment overtemperature will occur without warning.

Q3: What ambient temperature range applies to 4715KL-05W-B39?

The B39 class operates from -10°C to +70°C (B10 to B40 range). Storage temperature is -40°C to +70°C. The B39 operating temperature range accommodates industrial drive cabinet ambient temperatures up to 70°C — which may occur in poorly ventilated enclosures or in high ambient temperature industrial environments. Confirm from the drive's installation manual that cabinet ambient temperature stays within this range.

Q4: How does the 4715KL-05W-B39 (DC, 108 CFM) compare to 4715PS-20T-B30 (AC, 102 CFM) in the same cabinet?

Both are 120mm fans with similar airflow (108 vs 102 CFM), differing mainly in supply voltage (24V DC vs 200V AC). The DC fan offers the alarm signal and broader voltage operating range; the AC fan requires 200V supply directly. Selection depends on available supply voltage in the cabinet and whether fan alarm monitoring is required. In cabinets with both 24V and 200V available, the DC 4715KL with alarm monitoring is preferred for critical equipment.