MD520

For a 15 kW heavy-load motor, the selected MD520-4T15B(S) entry provides 32 A and uses the T4 housing. MD520-4T11B(S) also lists 15 kW, but on light-load duty: its heavy-load rating is 11 kW / 25 A and its housing is T3. Specify the duty and full code before comparing quotations. Both examples are in the three-phase 380–480 V class. [M1, printed pp. 27, 143]

Separate supply, braking and STO in the code

MD520 identifies the drive series. The supply codes are 4T for three-phase 380–480 V, 2T for three-phase 200–240 V and 2S for single-phase 200–240 V. The following number is the power step. B means a braking unit is fitted; S means the STO function is fitted. Parentheses in the manual's selection table show configuration alternatives and are not literal characters to put on an order. [M1, pp. 28–30]

For example, request the supplier's exact order string for the B/S configuration rather than copying “MD520-4T15B(S)” unchanged. The manual also distinguishes -T for the T5 DC-reactor option, -L for the T10–T12 AC-output-reactor option and -A for the T13 auxiliary distribution box. These suffixes identify different hardware arrangements. [M1, p. 29]

Selected 380–480 V ratings: heavy and light duty

The manual measures the power ratings of this voltage class at 440 V input. The following are output-current ratings. For these entries, heavy duty permits 150% rated current for 60 seconds; light duty permits 110% for 60 seconds. Select against the motor current and load cycle, rather than only the larger kW number. [M1, pp. 142–143, Table 6-2]

Moving from the 5.5 kW to the 7.5 kW heavy-duty entry changes the frame from T2 to T3. Moving from 11 kW to 15 kW heavy duty changes T3 to T4. The 32 A light-duty figure on the 11 kW code and the 32 A heavy-duty figure on the 15 kW code therefore represent different overload duties and cabinet layouts.

Dimensions and mounting pattern

Dimensions are millimetres, ordered W × H × D; A × B is mounting-hole spacing. The four holes have the diameter shown. These T1–T4 values come from Table 4-1; the frame-to-model assignments come from the manual's model list. Leave space for cables and cooling in addition to the enclosure dimensions. [M1, pp. 27, 49]

Braking: reference resistor and minimum resistance are different columns

For three-phase 380–480 V drives, the manual makes braking units standard for T1–T4 and optional for T5–T8; external MDBUN units are optional for T9–T13. The selected small-frame models below have a built-in unit. A resistor is a separate component. [M1, p. 30]

Table 5-42 gives reference resistor selections at 125% braking torque, ED 10% and a maximum of 10 seconds, alongside a separate minimum-resistance column. A 38 Ω recommendation for the 15 kW entry and its 24 Ω minimum are not interchangeable purchasing instructions. Use the reference package as the starting point and have the supplier calculate the actual stopping duty and thermal protection. [M1, pp. 117–123]

The manual recommends a resistor temperature switch interlocked with the input contactor. Provide deceleration time, load inertia and stopping frequency when asking for the resistor assembly. Its stated reference duty is particularly relevant when a machine stops more frequently or regenerates for longer than the reference cycle.

Document versions: the download label and printed revision differ

On 4 November 2026 the global MD520 product download tab labels its User Guide B02, data code PS00012134_PDF_EN. The downloaded 941-page PDF instead prints “Manual Package” and PS00012134B01 on its cover. Its latest revision-history entry is September 2024, B01; that entry identifies software A13. Record both the portal label and printed identifier when attaching this file to a purchase specification. [M1, PDF pp. 1–3] [M3]

The official European brochure is data code 19120220 V0.2, with a 2023 copyright. It lists the 380–480 V range up to 500 kW and describes the DC reactor as built in at 18.5 kW and above. The downloaded manual includes 560 and 630 kW 4T entries and makes the T5 DC reactor optional, with -T identifying that option. The brochure also describes built-in braking through 75 kW, while the manual distinguishes standard T1–T4 from optional T5–T8. Request the offered hardware bill of materials rather than assuming every brochure feature is standard on every configuration. [M2, PDF pp. 1–3] [M1, pp. 27–30]

Motor and control requirements to include

The current global product overview describes induction, synchronous and synchronous-reluctance motors. It also describes STO support, position and tension functions. Match those functions to the delivered hardware, software and option cards: an S suffix and the applicable safety documents belong in an STO specification; communications and feedback requirements belong in the option list. [M3]

1. Supply voltage and phase; full order code and fitted braking/STO/reactor options.
2. Motor type, rated current and the selected heavy- or light-duty overload cycle.
3. Frame, mounting drawing, cabinet temperature and cooling allowance.
4. Braking torque, stopping duration and frequency, resistor package and temperature protection.
5. PLC protocol, feedback device and required communication/PG cards.
6. Delivered manual and firmware versions, including resolution of the B02 portal / B01 file mismatch.

See the Inovance manufacturer profile for supplier context, or prepare an MD520 inquiry with the selected configuration.

Official sources

1. M1 — MD520 global User Guide download: portal B02; file PS00012134B01. 941 PDF pages. Printed pp. 27–30, 49, 117–123 and 142–143; PDF pp. 1–3 for document identity. Official PDF.
2. M2 — MD520 European brochure, data code 19120220 V0.2, copyright 2023. PDF pp. 1–3 and 12. Official brochure PDF.
3. M3 — MD520 global product page and Download tab. Product scope and portal document label. Manufacturer product page.

Prepared by the VFDMatch editorial team. Sources checked 4 November 2026. Ratings and revision identifiers follow the named documents. Generic illustrations are not product or factory photographs.