Lauritz Knudsen xD1000 AC Drive – Specs & Programming Guide

xD1000 Series AC Drives: Complete Guide to Features, Specifications & Programming

⚡ The xD1000 from Lauritz Knudsen Electrical & Automation is a compact, robust general-purpose variable frequency drive built for pumps, fans, conveyors and compressors across Industry & Building segments, as well as F&B, packaging, woodworking, textile and other special-purpose OEM machinery — spanning a 0.37kW Heavy Duty to 30kW Normal Duty range. It’s designed for a genuinely easy install, setup and maintenance experience, with advanced motor control that keeps energy consumption and running costs down. This guide covers everything from decoding the model number to wiring the drive and commissioning it for your application.

💡 Main Features

✅ Smaller footprint for compact enclosures, with clear identification of power terminals
✅ 4-digit LED display with operation-indicator text on both sides, and a removable remote terminal cover printed with wiring details, Start/Stop/Mode button lock arrangements and a short programming menu list
✅ Quick start guide and full parameter list included inside the packing box, plus an easily removable cooling fan for maintenance
✅ Slip Compensation and a choice of Linear, S-curve or U-curve acceleration/deceleration profiles
✅ 8 preset speeds, Auto Restart, Cooling Fan Control and Fast Stop (Ramp Divider)
✅ Skip (Jump) Frequency to ride through a mechanical resonance point, and Torque Boost for better low-speed starting torque
✅ Stall prevention via deceleration ramp time adaptation and current limiting during running
✅ DC braking during stopping, and Catch-on-the-Fly (speed search) for a smooth, reliable restart onto an already-spinning load — ideal for fans, AHUs, reactors and centrifuges
✅ Native V/F, Pump U2/F (quadratic V/F for centrifugal loads) and Sensorless Vector Control (SVC) motor control modes

🌬️ Application-Specific Functions (Pumps, Fans, HVAC & Fire Safety)

Beyond the general-purpose feature set, the xD1000 has functions built specifically for pumping, ventilation and life-safety equipment:

✅ Built-in PID for AHUs, fans, pumps & compressors — 4 preset PID references selectable via digital inputs, Wake-Up & Sleep mode to stop the motor at zero demand and restart it automatically, and PID Predictive Speed (Pre-PID frequency) to reach the target faster before the loop takes over
✅ Auxiliary pump function (1 master + 1 slave) — runs a fixed-speed auxiliary pump alongside the xD1000-driven variable-speed pump when the variable pump alone can’t deliver the full flow range needed, with the drive switching the auxiliary pump on/off via a relay output based on a pressure sensor signal (0–20mA, 4–20mA, 0–5V or 0–10V)
✅ Fault Inhibition (Fire Mode) — for life-safety equipment such as tunnel ventilation fans, smoke extraction fans and fire-fighting pumps, the drive’s own protective monitoring functions can work against the application’s purpose during an actual fire event. Fire Mode lets the drive keep running through conditions that would normally trip it, so the fan or pump keeps operating when it’s needed most

📋 Understanding the xD1000 Model Number

Every xD1000 drive’s part number follows the format xD1000-1234-VIBDEF. Here’s how each position decodes:

Code Position	Meaning
xD	Product — xD = Drives
1000	Drive model number
1234	Current rating code (A) — e.g. 01P5 = 1.5A, 08P9 = 8.9A, 60P0 = 60A
V — Mains Voltage	4 = 3-Phase 380–460VAC (the only mains-voltage class this series is offered in)
I — IP Class	B = IP20
B — Braking Unit	2 = With braking unit · 1 = Without (see the two smallest models below)
D — DC Reactor	1 = Without DC reactor
E — EMC Filter	1 = Without EMC filter (every xD1000 model ships without a built-in EMC filter — see Technical Specifications)
F — Future Use	1 = Reserved

💡 For example, XD1000-08P9-4B2111 is an 8.9A, 3-phase 380–460VAC drive, IP20, with a built-in braking unit, no DC reactor and no EMC filter fitted.

🌐 Network Architecture

The xD1000 connects to a PLC or HMI over a Modbus RTU serial link through its front RJ45 port. Multiple drives share a single RS485 line by daisy-chaining through Modbus splitters, with a line terminator fitted at the far end of the chain to prevent signal reflection — a simple, low-cost way to bring several drives onto one Modbus master without individual point-to-point wiring.

⚖️ Available Models & Ratings

The xD1000 is dual-rated: Normal Duty (ND, 110% overload for 60s) suits light, variable-torque loads like pumps and fans at a higher continuous kW, while Heavy Duty (HD, 150% overload for 60s) suits harder-starting, constant-torque loads like conveyors and compressors at a lower continuous kW on the same drive. All ratings below are 3-phase, 380–460VAC.

Model No.	Power ND (kW)	Output Current ND (A)	Power HD (kW)	Output Current HD (A)	Apparent Power HD (kVA)	Input Current HD at 460V (A)
XD1000-01P5-4B1111	NA	NA	0.37	1.5	1.4	1.80
XD1000-02P3-4B1111	NA	NA	0.75	2.3	2.5	3.10
XD1000-04P1-4B2111	NA	NA	1.5	4.1	4.3	5.40
XD1000-05P5-4B2111	NA	NA	2.2	5.5	5.7	7.20
XD1000-08P9-4B2111	4.0	8.9	3.0	7.1	7.3	9.20
XD1000-12P1-4B2111	5.5	12.1	4.0	9.5	9.1	11.4
XD1000-16P0-4B2111	7.5	16.0	5.5	12.6	11.4	14.3
XD1000-22P8-4B2111	11	22.8	7.5	17.0	17.8	22.4
XD1000-30P0-4B2111	15	30.0	11	24.0	24.2	30.4
XD1000-36P0-4B2111	18.5	36.0	15	33.0	30.7	38.5
XD1000-43P0-4B2111	22	43.0	18.5	39.0	36.5	45.8
XD1000-60P0-4B2111	30	60.0	22	46.0	46.2	53.2

💡 The two smallest models (01P5 and 02P3) are only offered with an ND rating listed as “NA” in the catalog — they’re sized for HD-class use only and don’t carry a separate Normal Duty rating.

🔧 Technical Specifications

Power range	0.37 – 22.0 kW (Heavy Duty) · 4.00 – 30 kW (Normal Duty)
Enclosure type	IP20 without the blanking plate on the upper part · IP4X with the top vent cover fitted
Rated voltage	3-Phase 380–460VAC (-15/+10%)
Rated frequency	50/60Hz (±5%)
Max output frequency	400Hz
Overload capacity	Heavy Duty: 150% of rated current for 1 min · Normal Duty: 110% for 1 min
Control method	V/F (2-Point), Pump U2/F (quadratic V/F for centrifugal loads), Sensorless Vector Control (SVC), Slip Compensation
V/F patterns	Linear, S Ramp, U Ramp
Acceleration / deceleration time	0.0s – 999.9s
Switching frequency	2–12kHz adjustable (4kHz nominal)
Starting torque	150% at 3Hz in V/F
Transient overtorque	170–200% of nominal motor torque, depending on drive rating and motor type
Braking torque	Up to 150% with DBR · up to 70% without DBR
Efficiency at full load	95 – 98%
Power factor (with line choke)	Displacement ≥ 0.98 · True PF ≈ 0.89
Built-in keypad	4-digit, 7-segment LED
Optional keypad	4-digit, 7-segment LED, IP54 (remote-mount)
EMC filter	Without EMC filter — an external filter is mandatory to fulfil the IEC/EN 61800-3 Category C3 requirement (CE variant: max 25m shielded motor cable · RE variant: max 5m shielded motor cable)
Communication protocol	Modbus (RTU frame) via RJ45, 2-wire RS485, 4800–38400bps
Ambient temperature (operation)	Heavy Duty: −10°C to +55°C without derating · Normal Duty: −10°C to +50°C without derating
Cooling	Forced fan cooling, except the two smallest models (0.37–0.75kW HD), which are convection-cooled
Compliance	CE, RoHS · IEC 61800-3, IEC 61800-5-1, IEC 60721-3

🔌 Wiring the xD1000 Drive

The xD1000 has three wiring zones: the main power circuit, the motor output, and the control terminal block.

Main power & motor circuit

✅ R/L1, S/L2, T/L3 — 3-phase 380–460V mains supply
✅ U/T1, V/T2, W/T3 — output to the motor
✅ PA/+, PB — braking resistor terminals (DC Bus + and output) — available on the XD1000-04P1-4B2111 model and above; the two smallest models have no braking unit and no PA/PB terminals
✅ Earth (⎓) — ground terminal, all ratings

Control terminals

Terminal	Type	Function
LI1–LI4	Logic input	4 programmable digital inputs (sink/source), 24Vdc (18–30Vdc), impedance 3.5kΩ — run/stop, direction, preset speeds, etc.
AI1	Analog input	0–5Vdc / 0–10Vdc / 0–20mA reference or PID feedback signal, doubles as a Logic Input Plus (LIU)
AO1	Analog output	0–10Vdc / 0–20mA output, e.g. for a remote frequency or process meter
LO+/LO−	Logic output	Transistor output (collector/emitter), 24Vdc max, 100mA max
R1A/R1B/R1C	Relay output	Form C changeover relay contact — commonly wired to a fault indicator, contactor, or the auxiliary-pump switching circuit
+5V, +24V, COM	Power/reference	Onboard supply rails for the analog reference and external switches
RJ45	Communication	Modbus serial port, or connection point for the optional remote LED keypad

⚠️ Always wire and check connections with the drive fully powered down and the DC bus capacitors discharged. Keep control wiring separate from the motor power cable, and remember that an external EMC filter and appropriately short/shielded motor cable are required to meet Category C3 compliance (see Technical Specifications).

💻 Programming & Commissioning the xD1000 Drive

The xD1000 ships with a built-in keypad and a short, quick-start-friendly menu, and can be extended with a remote keypad or brought onto a Modbus network for PLC-based control.

Keypad & display options

✅ Standard — built-in 4-digit, 7-segment LED display, with operation-indicator text printed on both sides for quick reading from either orientation
✅ Remote terminal cover — the removable cover itself is printed with wiring details, Start/Stop/Mode button lock arrangements and a short programming menu list, so a technician rarely needs to open the full manual for routine work
✅ XDOP-DOP-100 — optional IP54 remote LED keypad for mounting on a panel door away from the drive, connected via RJ45

Commissioning workflow

💡 Typical first-run sequence: power up the drive → enter the motor’s nameplate data (rated voltage, current, frequency and poles) → select the control mode that fits your load (V/F for general use, Pump U2/F for centrifugal pumps/fans, or SVC where more accurate torque control is needed) → set the acceleration/deceleration ramp shape and time (linear, S-curve or U-curve, 0.0–999.9s) → configure the 8 preset speeds and any Skip (Jump) Frequencies your application needs → assign the digital and analog I/O to match your wiring → for pump/fan/HVAC systems, configure the built-in PID (reference source, feedback source, and Wake-Up/Sleep thresholds) and, for booster sets, the Auxiliary Pump (1 master + 1 slave) function → for tunnel-fan, smoke-extraction or fire-pump duty, review whether Fire Mode (Fault Inhibition) should be enabled for your installation.

Communication setup

✅ Built-in Modbus (RTU frame) over the front RJ45 port (2-wire RS485, 4800–38400bps) — the only fieldbus protocol this series supports
✅ For multi-drive installations, daisy-chain several xD1000 units off one PLC/HMI Modbus master using Modbus splitters, with a line terminator at the far end of the chain (see the Network Architecture diagram above). Unlike Lauritz Knudsen’s xD3000 series, there are no CANopen or Ethernet-based (Modbus TCP/EtherNet IP/PROFIBUS/PROFINET) option cards for the xD1000

🧩 Accessories

CAT No.	Description
XDOP-DOP-100	Remote LED Keypad

🏭 Typical Applications

✅ Pumps, fans & blowers — HVAC, water supply and general building services, with built-in PID and Wake-Up/Sleep for unattended operation
✅ Booster pump sets — a variable-speed pump paired with a fixed-speed auxiliary pump via the built-in Auxiliary Pump (1 master + 1 slave) function
✅ Conveyors & compressors — constant-torque loads suited to the Heavy Duty rating
✅ Tunnel ventilation fans, smoke extraction fans & fire-fighting pumps — life-safety equipment that can use Fire Mode (Fault Inhibition) to keep running through a fire event
✅ F&B, packaging, woodworking, textile and other special-purpose OEM machines — general-purpose motor control with a compact footprint for space-constrained control panels

❓ Frequently Asked Questions

What’s the difference between the ND and HD ratings?

✅ Normal Duty (ND) gives 110% overload for 60 seconds at a higher continuous kW — suited to light, variable-torque loads like pumps and fans. Heavy Duty (HD) gives 150% overload for 60 seconds at a lower continuous kW on the same drive — suited to harder-starting, constant-torque loads like conveyors and compressors. Pick the rating that matches your load, not just the drive’s frame size.

What is Fire Mode / Fault Inhibition, and when do I need it?

✅ It’s for life-safety equipment — tunnel ventilation fans, smoke extraction fans, fire-fighting pumps — where the drive’s normal protective monitoring could stop it at exactly the moment it’s needed most. Fire Mode lets the drive keep running through fault conditions that would otherwise trip it during an actual fire event, prioritizing continued operation over protecting the drive itself.

Does the xD1000 need an external EMC filter?

✅ Yes — unlike Lauritz Knudsen’s xD3000 series, no xD1000 model ships with a built-in EMC filter. An external filter is mandatory to meet the IEC/EN 61800-3 Category C3 requirement, and the maximum shielded motor cable length depends on the filter type used (25m for a CE-type filter, 5m for an RE-type filter).

Do all xD1000 models have a built-in braking unit?

✅ No — the two smallest models (01P5 and 02P3, up to 0.75kW HD) have no braking unit available at all. A built-in braking unit is standard from the 04P1 (1.5kW HD) model upward.

What does the Auxiliary Pump function do?

✅ It lets a single xD1000-driven variable-speed pump work alongside a second, fixed-speed pump (1 master + 1 slave) to cover a flow range the variable pump can’t deliver alone. The drive reads a pressure sensor and switches the fixed-speed pump on or off via a relay output as demand rises or falls — a common pattern for booster sets in building water supply.

Which communication protocols does the xD1000 support?

✅ Built-in Modbus (RTU frame) only, via the front RJ45 port. Multiple drives can share one RS485 line using Modbus splitters. There’s no CANopen or Ethernet-based fieldbus option for this series — if you need those, see the xD3000 series instead.