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131B6976 Danfoss VLT FC-102 HVAC Drive 37 kW / 50 HP, 380 – 480 VAC, IP55
Danfoss 131B6976 VLT HVAC Drive FC-102, a 37 kW three-phase AC variable frequency drive designed for HVAC motor control, pumps, fans, compressors and building automation systems.
£2,714.25
Danfoss 131B6976 at a glance
The Danfoss 131B6976 is a 37 kW / 50 HP 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 C1, IP55 / UL Type 12 unit, built for wall mounting in plant rooms without a separate enclosure.
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: IP55 / UL Type 12 — built for wall mounting in plant rooms without a separate enclosure.
- 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
Smaller30 kWDanfoss 131B5479IP55 / UL Type 12 · frame B2View drive →
This drive37 kWDanfoss 131B6976IP55 / UL Type 12 · frame C1
Larger45 kWDanfoss 131B7017IP55 / UL Type 12 · frame C1View drive →
Same 37 kW rating, other enclosures
This driveIP55Danfoss 131B6976IP55 / UL Type 12
EnclosureIP20Danfoss 131F9931IP20 / chassisView drive →
EnclosureIP21Danfoss 131B7006IP21 / UL Type 1View drive →
EnclosureIP66Danfoss 131F2566IP66 / UL Type 4XView 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 | 37 kW | |
|---|---|---|
| Voltage | 480 V | |
| Phase | Three Phase | |
| IP Rating | IP55 | |
| EMC Filter | Commercial | |
| Series | VLT® HVAC Drive FC-102 | |
| Part Number | 131B6976 | |
| Product type | AC variable frequency drive | |
| Rated output power | 37 kW / 50 HP | |
| Continuous output current | 73 A | |
| Input voltage | 380–480 V AC | |
| Input phases | 3-phase | |
| Output phases | 3-phase | |
| Frequency | 50 / 60 Hz | |
| Protection rating | IP55 / Type 12 | |
| Frame size | C1 | |
| RFI filter | Class A1/B (C1) | |
| Brake chopper | No brake chopper | |
| PCB coating | Not coated PCB | |
| Mains option | No mains option | |
| Dimensions (H × W × D) | approx. 685 × 308 × 311 mm | |
| Net weight | approx. 39.79 kg |
Frequently asked questions
What is the maximum motor cable length with this RFI filter?
The 131B6976 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 IP55 / UL Type 12 enclosure is designed for direct mounting.
Type code decoded
FC-102P37KT4E55H3XGXXXXSXXXXAXBXCXXXXDX
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 | 37 kW / 50 HP | P37K |
| Mains voltage Position 11–12 | 3 × 380–480 V AC | T4 |
| Enclosure Position 13–15 | IP55 / UL Type 12 | E55 |
| 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 | No B option | BX |
| 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 |
