ATV21HD18N4

Name: ATV21HD18N4
Brand: Schneider
SKU: ATV21HD18N4

Efficient variable speed drive for asynchronous motors with variable torque applications.

Product ModelATV21HD18N4

Product ID33614

Stock on Request

Last updated: 8/29/2026

Quantity

Key Features

1
FeatureEfficient and reliable variable speed drive for asynchronous motors.
2
FeatureIdeal for applications requiring variable torque, ensuring optimal performance.
3
FeatureHigh power rating of 25 HP, suitable for demanding industrial tasks.
4
FeatureWide output frequency range of 0.5–200 Hz for flexible operation.
5
FeatureComprehensive protection features for safe and durable operation.

Technical Specifications

Detailed engineering parameters based on manufacturer documentation

Specifications may be subject to change without notice

Parameter

Value

Parameter

Value

Range of Product

Altivar 21

Product or Component Type

Variable speed drive

Product destination

Asynchronous motors

Product Specific Application

Pumps and fans in HVAC

Assembly style

With heat sink

Component name

ATV21

EMC filter

Class A EMC filter integrated

power supply voltage

380...480 V - 15...10 %

Phase

3 phase

Motor power kW

18.5 kW

Maximum Horse Power Rating

25 hp

Line current

27.8 A 480 V34.8 A 380 V

Speed range

1...10

Transient overtorque

120 % of nominal motor torque +/- 10 % 60 s

Asynchronous motor control profile

Constant voltage/frequency ratio with automatic IR compensationQuadratic voltage/frequency ratioCurrent flux vector control (FVC) without speed feedbackEnergy saving ratioConstant voltage/frequency ratio

communication port protocol

Modbus

Type of polarization

No impedance

IP degree of protection

IP20 on upper part without blanking plate on cover EN/IEC 60529IP20 on upper part without blanking plate on cover EN/IEC 61800-5-1IP21 EN/IEC 60529IP21 EN/IEC 61800-5-1IP41 on upper part EN/IEC 60529IP41 on upper part EN/IEC 61800-5-1

Option card

Communication card APOGEE FLNCommunication card BACnetCommunication card LonWorksCommunication card METASYS N2

power supply voltage limits

323...528 V

power supply frequency

50...60 Hz - 5...5 %

power supply frequency limits

47.5...63 Hz

Apparent power

28.2 kVA 380 V

maximum prospective line Isc

22 kA

maximum continuous output current

37 A 380 V37 A 460 V

Maximum transient current

40.7 A 60 s

Speed drive output frequency

0.5...200 Hz

Nominal switching frequency

8 kHz

Switching frequency

6...16 kHz adjustable8...16 kHz with derating factor

Speed accuracy

+/- 10 % of nominal slip 0.2 Tn to Tn

Torque accuracy

+/- 15 %

Regulation loop

Adjustable PI regulator

Motor slip compensation

Not available in voltage/frequency ratio motor controlAdjustableAutomatic whatever the load

diagnostic

for DC bus energized 1 LED (red)

Output voltage

<= power supply voltage

Insulation

Electrical between power and control

recommended type of cable for mounting in an enclosure

With UL Type 1 kit 3 UL 508 cable 104 °F (40 °C), copper 75 °C / PVCWithout mounting kit 1 IEC cable 113 °F (45 °C), copper 70 °C / PVCWithout mounting kit 1 IEC cable 113 °F (45 °C), copper 90 °C / XLPE/EPR

Electrical connection

VIA, VIB, FM, FLA, FLB, FLC, RY, RC, F, R, RES terminal 0.004 inÂ² (2.5 mmÂ²) / AWG 14L1/R, L2/S, L3/T terminal 0.04 inÂ² (25 mmÂ²) / AWG 3

Tightening torque

5.3 lbf.in (0.6 N.m) VIA, VIB, FM, FLA, FLB, FLC, RY, RC, F, R, RES)39.8 lbf.in (4.5 N.m), 40 lb.in L1/R, L2/S, L3/T)

Supply

Internal supply 24 V DC 21...27 V), <200 mA overload and short-circuit protectionInternal supply for reference potentiometer (1 to 10 kOhm) 10.5 V DC +/- 5 %, <10 mA overload and short-circuit protection

Analogue input number

Analogue input type

VIA switch-configurable current 0...20 mA 242 Ohm 11 bitsVIA switch-configurable voltage 0...10 V DC 24 V max 30000 Ohm 11 bitsVIB configurable PTC probe 0...6 probes 1500 OhmVIB configurable voltage 0...10 V DC 24 V max 30000 Ohm 11 bits

Sampling duration

F 2 ms +/- 0.5 ms discreteR 2 ms +/- 0.5 ms discreteRES 2 ms +/- 0.5 ms discreteVIA 2 ms +/- 0.5 ms analogVIB 2 ms +/- 0.5 ms analog

Response time

FLA, FLC 7 ms +/- 0.5 ms discreteFLB, FLC 7 ms +/- 0.5 ms discreteFM 2 ms +/- 0.5 ms analogRY, RC 7 ms +/- 0.5 ms discrete

Accuracy

+/- 1 % FM) for a temperature variation 60 °C+/- 0.6 % VIA) for a temperature variation 60 °C+/- 0.6 % VIB) for a temperature variation 60 °C

Linearity error

FM +/- 0.2 % outputVIA +/- 0.15 % of maximum value inputVIB +/- 0.15 % of maximum value input

Analogue output number

Analogue output type

FM switch-configurable current 0...20 mA 500 Ohm 10 bitsFM switch-configurable voltage 0...10 V DC 470 Ohm 10 bits

Discrete output number

Discrete output type

Configurable relay logic FLA, FLC) NO - 100000 cyclesConfigurable relay logic FLB, FLC) NC - 100000 cyclesConfigurable relay logic RY, RC) NO - 100000 cycles

Minimum switching current

3 mA 24 V DC configurable relay logic

Maximum switching current

2 A 250 V AC inductive cos phi = 0.4 L/R = 7 ms FL, R)2 A 30 V DC inductive cos phi = 0.4 L/R = 7 ms FL, R)5 A 250 V AC resistive cos phi = 1 L/R = 0 ms FL, R)5 A 30 V DC resistive cos phi = 1 L/R = 0 ms FL, R)

Discrete input type

F programmable 24 V DC level 1 PLC 3500 OhmR programmable 24 V DC level 1 PLC 3500 OhmRES programmable 24 V DC level 1 PLC 3500 Ohm

Discrete input logic

Negative logic (sink) F, R, RES), >= 16 V, <= 10 VPositive logic (source) F, R, RES), <= 5 V, >= 11 V

Acceleration and deceleration ramps

Automatic based on the loadLinear adjustable separately from 0.01 to 3200 s

Braking to standstill

By DC injection

Protection type

Against input phase loss driveBreak on the control circuit driveInput phase breaks driveLine supply overvoltage and undervoltage driveLine supply undervoltage driveOvercurrent between output phases and earth driveOverheating protection driveOvervoltages on the DC bus driveShort-circuit between motor phases driveThermal power stage driveMotor phase break motorThermal protection motorWith PTC probes motorAgainst exceeding limit speed drive

Insulation resistance

>= 1 mOhm 500 V DC for 1 minute

Frequency resolution

Analog input 0.024/50 HzDisplay unit 0.1 Hz

Connector Type

1 RJ45

Physical interface

2-wire RS 485

Transmission frame

RTU

Transmission Rate

9600 bps or 19200 bps

Data format

8 bits, 1 stop, odd even or no configurable parity

Number of addresses

1...247

Communication Service

Read device identification (43)Time out setting from 0.1 to 100 sMonitoring inhibitableWrite multiple registers (16) 2 words maximumRead holding registers (03) 2 words maximumWrite single register (06)

marking

Operating position

Vertical +/- 10 degree

Height

13.0 in (329.5 mm)

Width

9.6 in (245 mm)

Depth

7.5 in (190 mm)

Net Weight

25.68 lb(US) (11.65 kg)

Noise level

54 dB 86/188/EEC

Dielectric strength

3535 V DC between earth and power terminals5092 V DC between control and power terminals

Electromagnetic compatibility

1.2/50 Âµs - 8/20 Âµs surge immunity test level 3 IEC 61000-4-5Conducted radio-frequency immunity test level 3 IEC 61000-4-6Electrical fast transient/burst immunity test level 4 IEC 61000-4-4Electrostatic discharge immunity test level 3 IEC 61000-4-2Radiated radio-frequency electromagnetic field immunity test level 3 IEC 61000-4-3Voltage dips and interruptions immunity test IEC 61000-4-11

Standards

IEC 61800-3 environments 1 category C3IEC 61800-3IEC 61800-3 environments 1 category C1UL Type 1IEC 61800-3 environments 1 category C2EN 61800-3 category C3IEC 61800-3 environments 2 category C3EN 61800-3 environments 1 category C2EN 55011 class A group 1EN 61800-3 environments 2 category C1EN 61800-3EN 61800-5-1IEC 61800-3 category C2IEC 61800-3 environments 2 category C2IEC 61800-3 category C3EN 61800-3 category C2IEC 61800-5-1IEC 61800-3 environments 2 category C1EN 61800-3 environments 1 category C1EN 61800-3 environments 1 category C3EN 61800-3 environments 2 category C2EN 61800-3 environments 2 category C3

Product Certifications

NOM 117ULCSAC-tick

Vibration resistance

1 gn 13...200 Hz)EN/IEC 60068-2-81.5 mm 3...13 Hz)EN/IEC 60068-2-6

Shock resistance

15 gn 11 ms IEC 60068-2-27

Pollution degree

2 IEC 61800-5-1

Environmental characteristic

Classes 3C1 IEC 60721-3-3Classes 3S2 IEC 60721-3-3

Relative humidity

5...95 % without condensation IEC 60068-2-35...95 % without dripping water IEC 60068-2-3

Ambient air temperature for operation

14...104 °F (-10...40 °C) without derating)104...122 °F (40...50 °C) with derating factor)

Ambient Air Temperature for Storage

-13...158 °F (-25...70 °C)

Operating altitude

<= 6561.68 ft (2000 m)3280.84...9842.52 ft (1000...3000 m) limited to 2000 m for the Corner Grounded distribution network