SK-G9-FAN2-F1 — 700 Series Frame 1 Internal Cooling Fan Kit

The SK-G9-FAN2-F1 is the internal cooling fan replacement kit for Frame 1 drives in the 700 series AC drive family. The internal fan circulates air across the drive's heat-generating components — the IGBT power modules, gate driver boards, and DC bus capacitors — to maintain operating temperatures within safe limits. When this fan fails or degrades, drive internal temperatures rise, thermal protection faults become more frequent, and if the condition goes unaddressed, it shortens the service life of every component inside the drive.

Drives in continuous production service can run 8,000–12,000 hours per year. Fan bearing life at those duty cycles doesn't always match the drive's full service life. Stocking the SK-G9-FAN2-F1 as a maintenance spare means a failed fan gets replaced in minutes rather than triggering an emergency parts search while production is stopped. For critical processes where drive downtime is measured in lost product, having this kit on the shelf is straightforward risk management.

Specifications

Parameter	Value
Part Number	SK-G9-FAN2-F1
Compatible Drive	700 Series AC Drive, Frame 1
Fan Position	Internal (circulates air within drive enclosure)
Kit Type	Factory replacement kit — includes fan assembly and hardware
Connector Type	Plug-in (mates with drive's existing fan power connector)
Installation Type	Field replaceable, no special tools required
Frame Compatibility	Frame 1 only (separate kits required for other frames)

Recognizing Fan Degradation Before It Faults the Drive

A fan that's failing warns you before it fails completely. The signs, in roughly the order they typically appear:

Changed acoustic signature: any shift from the fan's normal sound — higher pitch, intermittent rattling, grinding — is worth investigating. Fans don't get quieter as they wear.
Elevated drive operating temperature: the drive's internal temperature parameter (accessible via the HIM or over the network) trends upward compared to its historical baseline for the same load and ambient conditions.
Increased overtemperature fault frequency: faults that used to occur only in peak summer heat now occur in moderate ambient conditions. The thermal headroom is shrinking because cooling is degrading.
Visible blade contamination: if the drive's airway is accessible, accumulated debris on the fan blades is a clear sign the fan needs cleaning or replacement.

In facilities with scheduled predictive maintenance programs, periodic measurement of drive operating temperature at known load levels (compared to a commissioning baseline) is one of the most reliable indicators of cooling system degradation — more reliable than waiting for fault codes.

Replacement Procedure

Fan replacement on Frame 1 drives is a field procedure, but hazardous energy control is mandatory before starting.

De-energize fully: disconnect AC input power and wait for the DC bus to discharge completely. The 700 series drive has a DC bus voltage indicator or LED; do not proceed until the bus has discharged to a safe level. Verify with a meter if uncertain. Frame 1 drives typically discharge within a few minutes, but verify — don't assume.
Access the fan: the fan assembly is accessible from the top or front of the drive depending on the mounting orientation. Refer to the drive's service documentation for the specific access path for the installed Frame 1 unit.
Disconnect the fan connector: the fan plugs into a dedicated connector on the drive's control board or power supply board. Note the connector orientation before disconnecting.
Remove and replace: the fan assembly typically secures with two to four M4 screws. Remove the old assembly, install the new one from the kit, tighten screws to the specified torque.
Reconnect and verify: plug the connector into the same port, close the drive, restore power, and verify the fan runs immediately on drive power-up. Check the drive's operating temperature over the first 30 minutes at normal load and confirm it returns to historical baseline.

Never work inside the drive without first confirming DC bus voltage has discharged to a safe level with a calibrated meter. The DC bus capacitors in the 700 series retain dangerous voltage after AC power is removed. Visual inspection alone is not sufficient — always measure.

FAQ

Q: How often should the cooling fan be replaced as preventive maintenance?

Fan bearing life depends heavily on duty cycle, ambient temperature, and contamination level. A commonly-used guideline for continuously-running drives in moderate environments is 3–5 years, but monitoring operating temperature trends is more reliable than a fixed interval. Replace when temperature trends upward from baseline, not on a fixed calendar schedule.

Q: Is this kit compatible with Frame 2 or other frame sizes?

No. The SK-G9-FAN2-F1 is Frame 1 specific. Each frame size requires its own kit due to differences in fan dimensions, airflow capacity, and connector configuration. Using a kit from a different frame will not fit correctly.

Q: Can the fan be cleaned and reused instead of replaced?

Blade cleaning is a valid maintenance task for contamination-related performance degradation. However, if the bearing has developed noise or the fan has been running at elevated temperature for an extended period, cleaning the blades doesn't address the underlying bearing wear. Replacement is the correct action once bearing degradation is suspected.

Q: What happens if the fan fails completely without replacement?

The drive's thermal protection will fault the drive when internal temperature exceeds the trip threshold. Continued operation with a failed fan — even if the drive keeps running for a period — accelerates degradation of IGBT modules, DC bus capacitors, and control electronics. Capacitor electrolyte evaporation, IGBT junction temperature cycling beyond design limits, and solder joint fatigue all accumulate. The cost of a fan kit is negligible compared to the cost of the components it protects.

SK-G9-FAN2-F1 Brand New 700 Internal Fan Kit SKG9FAN2F1