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ABB 751010R0815 Power supply unit

What this chapter contains

This chapter contains the instructions that you must follow when selecting the motor,

cables, protections, cable routing and way of operation for the drive system.

Note: The installation must always be designed and made according to applicable

local laws and regulations. ABB does not assume any liability whatsoever for any

installation which breaches the local laws and/or other regulations. Furthermore, if

the recommendations given by ABB are not followed, the drive may experience

problems that the warranty does not cover.

Motor selection and compatibility

1. Select the motor according to the rating tables in chapter Technical data. Use the

DriveSize PC tool if the default load cycles are not applicable.

2. Check that the motor ratings lie within the allowed ranges of the drive control

program:

• motor nominal voltage is 1/2 ... 2 · UN of the drive

• motor nominal current is 1/6 ... 2 · I2hd of the drive in DTC control and

0 ... 2 · I2hd in scalar control. The control mode is selected by a drive parameter

3. Check that the motor voltage rating meets the application requirements:

See note 7 below the Requirements table, page 42.

4. Consult the motor manufacturer before using a motor in a drive system where the

motor nominal voltage differs from the AC power source voltage.

5. Ensure that the motor insulation system withstands the maximum peak voltage in

the motor terminals. See the Requirements table below for the required motor

insulation system and drive filtering.

Example 1: When the supply voltage is 440 V and a drive with a diode supply is

operating in motor mode only, the maximum peak voltage in the motor terminals

can be approximated as follows: 440 V · 1.35 · 2 = 1190 V. Check that the motor

insulation system withstands this voltage.

Resistor braking Motor voltage rating

no resistor braking is in use UN

frequent or long term brake cycles will be used UACeq1

UN = rated input voltage of the drive

UACeq1 = UDC/1.35

UACeq1 = the equivalent AC power source voltage of the drive in V AC.

UDC = the maximum DC link voltage of the drive in V DC.

For resistor braking: UDC= 1.21 × nominal DC link voltage.

Note: Nominal DC link voltage is UN × 1.35 in V DC.

Protecting the motor insulation and bearings

The output of the drive comprises – regardless of output frequency – pulses of

approximately 1.35 times the equivalent mains network voltage with a very short rise

time. This is the case with all drives employing modern IGBT inverter technology.

The voltage of the pulses can be almost double at the motor terminals, depending on

the attenuation and reflection properties of the motor cable and the terminals. This in

turn can cause additional stress on the motor and motor cable insulation.

Modern variable speed drives with their fast rising voltage pulses and high switching

frequencies can generate current pulses that flow through the motor bearings, which

can gradually erode the bearing races and rolling elements.

The stress on motor insulation can be avoided by using optional ABB du/dt filters.

du/dt filters also reduce bearing currents.

To avoid damage to motor bearings, the cables must be selected and installed

according to the instructions given in the hardware manual. In addition, insulated N end (non-driven end) bearings and output filters from ABB must be used according

to the following table. Two types of filters are used individually or in combinations:

• optional du/dt filter (protects motor insulation system and reduces bearing currents).

• common mode filter (mainly reduces bearing currents).

Requirements table

The following table shows how to select the motor insulation system and when an

optional ABB du/dt filter, insulated N-end (non-driven end) motor bearings and ABB

common mode filters are required. Ignoring the requirements or improper installation

may shorten motor life or damage the motor bearings and voids the warranty.

Motor type Nominal mains

voltage (AC line

voltage)

Requirement for

Motor insulation

system

ABB du/dt filter, insulated N-end bearing and ABB common mode

filter

PN < 100 kW

and

frame size < IEC 315

100 kW < PN < 350 kW

or

frame size > IEC 315

PN > 350 kW

or

frame size > IEC 400

PN < 134 hp

and

frame size <

NEMA 500

134 hp < PN < 469 hp

or

frame size >

NEMA 500

PN > 469 hp

or

frame size >

NEMA 580

A

B

Random wound M2_,

M3_ and

M4_

UN < 500 V Standard - + N + N + CMF

500 V < UN < 600 V Standard + du/dt + du/dt + N + du/dt + N + CMF

or

Reinforced - + N + N + CMF

600 V < UN < 690 V

(cable length <

150 m)

Reinforced + du/dt + du/dt + N + du/dt + N + CMF

600 V < UN < 690 V

(cable length >

150 m)

Reinforced - + N + N + CMF

Form-wound

HX_ and

AM_

380 V < UN < 690 V Standard n.a. + N + CMF PN < 500 kW: + N +

CMF

PN > 500 kW: + N +

CMF + du/dt

Old* form wound HX_

and modular

380 V < UN < 690 V Check with the motor

manufacturer.

+ du/dt with voltages over 500 V + N + CMF

Random wound HX_

and AM_ **

0 V < UN < 500 V Enamelled wire with

fibre glass taping

+ N + CMF

500 V < UN < 690 V + du/dt + N + CMF

HDP Consult the motor manufacturer.

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