Waterproof Pump VFD: IP54 and IP65 Sealed Inverters

The sealed inverter: AU8000 / VC8000

The AU8000 documentation describes a fully enclosed, one-piece moulded housing with no gaps at the corners, an independent heat-dissipation structure that isolates the internal circuit board from the external environment, and a waterproof high-power fan. Its own comparison table sets the format against a normal IP20 inverter: the sealed unit is rated IP65, can be installed in a cabinet or exposed, and is documented for the environments where an open inverter fails quickly — its application list includes grinding machines, CNC machine tools, chemical plants, printing and dyeing plants, saline-alkali land, graphite and stone processing, food processing, sewage pumps, limestone plants and feed factories.

AU8000 / VC8000	Published specification
Control modes	Open-loop vector (SVC), closed-loop vector (FVC), V/F control
Maximum frequency	0–500 Hz; carrier 0.8–8 kHz auto-adjusted with load (AU8000 / VC8000)
Starting torque (G type)	0.5 Hz/150% (SVC); 0 Hz/180% (FVC)
Speed range / precision	1:100 (SVC); ±0.5% (SVC); torque control precision ±5% (FVC)
Overload capability	G type: 150% of rated current for 1 min; 180% for 3 s (AU8000 / VC8000)
Documented protections	“11 big protections” per the series documentation, plus over-voltage/over-current stall control and quick current limit

The backpack pump formats: IP54

For pump duty specifically, the AU620, AU820 and M820 lines publish the pump feature set — constant-pressure PID, dry-run and burst-pipe protection, multi-pump master/auxiliary control — in an IP54 backpack enclosure that mounts on the pump set itself, documented as “backpack installation”. The YS620 pump documentation likewise publishes IP65/IP54 protection statements for its pump-drive formats (IP65 in its series overview, IP54 in its attribute list). The pump feature set is on the pump VFD page; the constant-pressure application is on the booster pump VFD page.

Choosing between IP54 and IP65 formats

The two formats are documented differently: the IP54 backpack inverters mount on the pump set itself — “backpack installation” in the AU620/AU820 documentation — while the AU8000's documentation states the sealed unit can be installed in a cabinet or exposed, and lists its application environments on the same page. Ratings are series-level publications; for the protection grade of the exact model you order, ask for it to be stated in its quotation.

Frequently asked questions

Can the IP65 drive really be installed outdoors?

The AU8000 documentation states the sealed inverter can be installed in a cabinet or exposed, and lists outdoor-class environments among its applications. Ask for the exact model's grade and cable-gland arrangement to be stated in the quotation.

Is the backpack drive a pump controller or a VFD?

Both: the backpack lines (AU620, AU820 and M820) are VFDs with the pump control functions — PID constant pressure, dry-run protection, multi-pump logic — built in, in an IP54 backpack enclosure; the AU620 publishes V/F control with a 0–200 Hz output.

What powers do the sealed formats cover?

The platform catalogue lists IP65 VFD models including a 55–75 kW class listing and waterproof models across the small-to-mid range; for the applicable model for your motor, ask with your enquiry.