VACON0020-3L-0038-4-R02
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MPN: 135N3846
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The VACON0020-3L-0038-4-R02 is a low voltage drive manufactured by Danfoss. Part of the VACON 20 Low Voltage Drives, it delivers an output power of 18.5 kW and a continuous output current of 38 A. The drive features an input voltage of 380-480 VAC 3-phase and an output frequency range of 0-320 Hz.
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Product Description:
Danfoss produces the VACON0020-3L-0038-4-R02 drive as a part of the VACON series and its designated reference code is 135N3846. It uses control methods of V/f and open loop vector. This drive offers 18.5 kW of motor shaft power and it utilizes 41.7 A of nominal input current from a 3 x 380 to 480 VAC source.
The VACON0020-3L-0038-4-R02 drive supports a switching frequency between 1 - 16000 Hz and it offers a field point adjustment from 30 - 320 Hz. Its accel/deceleration times can be set up to 3000 s. The unit relays on air cooling and required an airflow of about 75 m³/hour, along with 20 mm free space on both sides as well as 100 mm above and 50 mm below for efficient ventilation. Its enclosure protection level is IP21/NEMA 1 and it comes in a MI5 frame that supports both screw and flange mounting, while measures 414 mm H x 165 mm W x 202 mm D. This VACON drive delivers continuous current of 38 A at the output section and its output voltage follows the input up to 100%, while its output frequency range is up to 320 Hz with resolution of 0.010 Hz. Its overload capacity allows 1.5 times current for one minute or 2 times for two seconds and its braking torque is 30% without resistor and 100% with external brake resistor.
The VACON0020-3L-0038-4-R02 drive’s I/O interfaces are designed for flexible control with six digital inputs that offers selectable logic, as well as analogue inputs that include voltage from up to 10 V and current up to 20 mA. The unit’s short circuit protection withstands 3.8 kA without choke and 50 kA with choke. Its reconnection to mains is limited to once/minute and it achieves C2 compliance with internal RFI filter.
Frequently Asked Questions about VACON0020-3L-0038-4-R02:
Q: How does the switchable digital input logic benefit VACON0020-3L-0038-4-R02 (135N3846)?
A: Its switchable digital input logic lets you adapt the drive directly to different PLC sources without external conversion cables. This reduces I/O mismatches and improves installation flexibility—ensuring signal integrity across logic types.
Q: Why does VACON0020-3L-0038-4-R02 (135N3846) limit reconnection to mains to once per minute?
A: This limitation protects internal components and suppresses inrush currents that could otherwise damage the internal rectifier and DC bus. It preserves longevity by preventing thermal and electrical stress—extending the DC bus life.
Q: What advantage does the field-point adjustment (30–320 Hz) provide in VACON0020-3L-0038-4-R02?
A: It allows fine-tuning of maximum motor speed for precision applications without reprogramming control logic. That flexibility helps match specific load curves—optimizing performance within ±0.01 Hz resolution.
Q: How does the 50 kA short-circuit withstand rating (with choke) affect safety for VACON0020-3L-0038-4-R02?
A: The 50 kA capability, withstands severe fault currents when an input choke is installed, protecting downstream components and conduction paths. This high rating ensures compliance with industrial safety standards—minimizing downtime under heavy fault.
Q: Why is air cooling with 75 m³/h airflow requirement important for VACON0020-3L-0038-4-R02 (135N3846)?
A: The defined airflow ensures consistent heat dissipation from internal power electronics, especially during continuous 38 A output operation. Meeting that minimum airflow maintains junction temperatures within safe limits—preserving drive reliability.
