r-tec FU Control Unit

Overview

In most places where an HPVC door is installed, the only supply on hand is single-phase — which is exactly where FU earns its place. It is a frequency inverter (VFD) control unit that takes a single-phase 220 VAC input and turns it into a three-phase 3 × 220 VAC output. Its primary job is driving rapid PVC door (HPVC) motors; flip mode via DIP switch 5 and the same board also runs sliding garden gate motors. In small facilities, retail stores and especially inland-region HPVC door applications where no three-phase mains is brought in, it is often the only practical solution — you get three-phase performance without a three-phase investment on your mains.

Why FU?

In industrial facilities, 380 V three-phase mains is usually brought in; however, HPVC door applications are often mounted at lower-capacity single-phase 220 V points because they are small retail + inland region separation doors. FU fills this gap:

• Avoids the cost of bringing in a three-phase mains — no new electrical panel investment is made.
• Produces the three-phase movement required by the HPVC drum motor internally — no other motor type change is required.
• Fabric is protected with soft start/stop — hard starting accelerates HPVC vinyl fabric fatigue and tearing; the inverter ramp reduces this fatigue.

Cross-product (mode change via DIP 5)

DIP 5	Mode	Typical use
OFF	Sliding garden gate mode	Rail garden gate together with KING 1000/2000 220 V
ON	Rapid PVC door mode	HPVC drum rotation with RAPID 35-180 motor

In dealer stock strategy this provides the single board, two product families advantage — instead of separate barrier/HPVC board stocks, FU serves as a backup for both.

DIP switch functions (5 control + 2 motor type)

Control DIP (5 switches):

Switch	OFF	ON
SW1	Automatic closing off	Automatic closing on (time via T5 trimpot)
SW2	Normal	Deadman mode (hold button continuously pressed)
SW3	Optical sensor passive	Optical sensor active
SW4	Door opens to the right (factory)	Door opens to the left (+ motor U/W swap)
SW5	Sliding garden mode	Rapid PVC door mode

Motor type DIP (2 switches): Board behaviour according to motor power:

SW1	SW2	Motor power
OFF	OFF	0.75 kW
ON	OFF	1.1 kW
OFF	ON	1.5 kW
ON	ON	2.2 kW

5 trimpots — site fine tuning

• T1 — Opening high speed.
• T2 — Closing high speed (default 1/3 of the opening speed).
• T3 — Start frequency (soft start curve).
• T4 — Slow speed (deceleration approach).
• T5 — Automatic closing waiting time.

Keeping the closing speed lower than the opening prevents the HPVC fabric from entering tension fatigue during sudden descent. In site trial T2 is softened according to the site.

Switch inputs (4 limits)

• Sw1 — Closing limit switch (door fully closed).
• Sw2 — Closing deceleration (pre-limit, soft stop trigger).
• Sw3 — Opening deceleration.
• Sw4 — Opening limit switch (door fully open).

In HPVC, fast drum rotation + soft-stop double-limit + double-deceleration geometry is mandatory — barrier/garage doors are sufficient with a single limit, HPVC is not.

Encoder support

Encoder-equipped HPVC motors are supported with 5 V/12 V B/A/GND/+24 V inputs (sliding garden motors are encoder-free). The encoder provides precise position tracking — critical especially for frequency-based inverter driving.

Remote control (optional)

A 433 MHz rolling-code receiver board slot comes as standard. In standard mode 1 remote + 2,000 copies, in common mode 120 different remotes × 2,000 = 240,000 remote capacity (separate remote for each user in a large estate).

Target products

• ALKUR HPVC — RAPID 35-180 motor + FU combination standard kit.
• r-tec sliding garden (220 V series) — with KING 1000, KING 2000, KING 3000 FU motors in the DIP 5 OFF position.

Model notes

Inverter parameters must not be separated from the factory default according to the motor label current. Fine adjustment can be made by the site via T1–T5 trimpots; if DIP switch positions are selected incorrectly the motor thermal protection can trip early. The detailed parameter table is in the technical PDF.

Installation and Commissioning

The FU inverter drives high-speed PVC doors by converting a 220 V single-phase supply into a 3 × 220 VAC motor output; commissioning is done by defining the door type and setting the speed profile. General flow:

• Supply and motor connection: The single-phase supply and motor output leads are connected to the terminals; grounding and the thermal fuse are checked.
• Door type (DIP switch): The DIP switch combination defines the door type (for example standard HPVC, cold storage); the wrong combination changes the motor characteristics.
• Speed profile (trimpots): The opening/closing profile is set with the speed, brake and ramp trimpots; adjustments are made in small steps (1/8 turn).
• Test and reset: The profile is verified with a few full open/close cycles; on a fault, power is cut for 1 minute and reapplied to reset.

Comprehensive parameter setting and reset must be done only by trained personnel, per the reference values in the model guide.