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135N5751 Danfoss VLT HVAC Drive 5.5 kW/7.5HP 380-480VAC IP66
Danfoss 135N5751 VLT HVAC Drive FC 102, a 5.5 kW three phase AC variable frequency drive with IP66 NEMA 4X enclosure, RFI Class A1/B filter and MCB-109 I/O with RTC back-up for HVAC applications.
£992.75
Danfoss 135N5751 at a glance
The Danfoss 135N5751 is a 5.5 kW VLT HVAC Drive FC 102 for 3 × 380–480 V AC supplies, made for the fans, pumps and compressors in building services. It is a frame A5, IP66 / UL Type 4X unit, built for wall mounting in wet, dusty or wash-down locations.
This configuration has RFI class A1/B (C1) with reduced motor cable length, no brake chopper, and a graphical LCP 102 control panel. The full type code is decoded alongside the FAQs.
Sizing and installation
- Enclosure: IP66 / UL Type 4X — built for wall mounting in wet, dusty or wash-down locations.
- EMC: RFI class A1/B (C1) is met only with a reduced screened motor cable length. Check the maximum length for this frame in the Danfoss FC 102 Design Guide (Technical Documents tab); for longer runs, ask us about an H2 (A2/C3) variant.
FC 102 features for HVAC
- Built-in RS-485 protocols: Danfoss FC, Modbus RTU, BACnet MS/TP, Metasys N2 and FLN Apogee — connects to most building management systems without an option card.
- Fire Mode keeps the drive running during an emergency, for example to keep smoke-extract fans turning.
- Automatic Energy Optimisation (AEO) cuts motor losses at part load — Danfoss quotes a further 5–15% saving.
- Pump and fan functions: sleep mode, dry-pump, end-of-curve and broken-belt detection, plus a built-in cascade controller for pump sets.
- Built-in DC coils limit mains harmonics (EN 61000-3-12).
- Smart Logic Controller for simple sequencing without a PLC.
Where the energy saving comes from
Centrifugal fans and pumps follow the affinity laws: absorbed power falls with the cube of speed. Running at 80% speed needs roughly half the power of full speed (0.8³ ≈ 0.51, before motor and drive losses) — which is why speed control pays back faster on fans and pumps than almost any other load.
Other sizes and enclosures
Same configuration, different power
Smaller4 kWDanfoss 131X6779IP66 / UL Type 4X · frame A5View drive →
This drive5.5 kWDanfoss 135N5751IP66 / UL Type 4X · frame A5
Larger7.5 kWDanfoss 131X6778IP66 / UL Type 4X · frame A5View drive →
Same 5.5 kW rating, other enclosures
This driveIP66Danfoss 135N5751IP66 / UL Type 4X
EnclosureIP20Danfoss 131B5473IP20 / chassisView drive →
EnclosureIP55Danfoss 131F5418IP55 / UL Type 12View drive →
Typical applications
✓ Supply and extract fans in air-handling units
✓ Chilled- and hot-water circulation pumps
✓ Cooling towers and condenser fans
✓ Booster sets and multi-pump stations
✓ Ventilation and smoke-extract systems
Technical Specifications
Tick the specs you need, then view products that match.
| Power | 5.5 kW | |
|---|---|---|
| Voltage | 480 V | |
| Phase | Three Phase | |
| IP Rating | IP66 | |
| EMC Filter | Commercial | |
| Series | VLT® HVAC Drive FC 102 | |
| Alternative model code | FC-102P5K5T4E66H3XGXXXXSXXXXAXB0CXXXXDX | |
| Product type | AC variable frequency drive | |
| Rated output power | 5.5 kW | |
| Motor rating | 7.5 HP | |
| Input voltage | 380–480 V AC | |
| Input phases | Three phase | |
| Output phases | Three phase | |
| Frequency | 50 / 60 Hz | |
| Protection rating | IP66 / NEMA 4X | |
| Frame size | A5 | |
| RFI filter | Class A1/B (C1) | |
| Brake chopper | No | |
| Control panel | Graphical Local Control Panel | |
| Option card | MCB-109 I/O with RTC back-up | |
| PCB coating | Not coated PCB | |
| Mains option | No mains option | |
| Software | Latest release standard software |
Frequently asked questions
What is the maximum motor cable length with this RFI filter?
The 135N5751 has the H3 filter: RFI class A1/B (C1) with a reduced motor cable length. The exact limit for this frame is in the Danfoss VLT HVAC Drive FC 102 Design Guide (see Technical Documents). If your screened cable run is longer, contact us and we will suggest an alternative.
Which communication protocols are built in?
Danfoss FC, Modbus RTU, BACnet MS/TP, Metasys N2 and FLN Apogee over the built-in RS-485 port. This unit has no fieldbus option card fitted, so PROFIBUS, PROFINET, EtherNet/IP or BACnet/IP would need an MCA option card.
Can this drive be wall mounted without a panel?
Yes. The IP66 / UL Type 4X enclosure is designed for direct mounting.
Type code decoded
FC-102P5K5T4E66H3XGXXXXSXXXXAXB0CXXXXDX
G fitted / defines this unit X not fitted / standard
| Product series Position 1–6 | VLT HVAC Drive FC 102 | FC-102 |
|---|---|---|
| Power size Position 7–10 | 5.5 kW | P5K5 |
| Mains voltage Position 11–12 | 3 × 380–480 V AC | T4 |
| Enclosure Position 13–15 | IP66 / UL Type 4X | E66 |
| RFI filter Position 16–17 | RFI class A1/B (C1) with reduced motor cable length | H3 |
| Brake / Safe Stop Position 18 | No brake chopper | X |
| Local control panel Position 19 | Graphical LCP 102 | G |
| PCB coating Position 20 | Standard (uncoated) PCBs | X |
| Mains option Position 21 | No mains option | X |
| Adaptation A Position 22 | Standard cable entries | X |
| Adaptation B Position 23 | Standard | X |
| Software release Position 24–27 | Latest standard release | SXXX |
| Software language Position 28 | Standard language package | X |
| A option (fieldbus) Position 29–30 | No fieldbus option | AX |
| B option (I/O) Position 31–32 | MCB 109 analogue I/O with real-time-clock back-up | B0 |
| C0 option Position 33–34 | No C0 option | CX |
| C1 option Position 35 | No C1 option | X |
| C option software Position 36–37 | None | XX |
| D option Position 38–39 | No D option | DX |
