Emerson Unidrive m700 User manual

User Guide

Low voltage DC

operation in

Elevator Applications

Unidrive M700

Frame sizes 3 to 10

Issue: 1

Page | 2

Original Instructions

For the purposes of compliance with the EU Machinery Directive 2006/42/EC

General information

The manufacturer accepts no liability for any consequences resulting from inappropriate, negligent or incorrect installation or

adjustment of the optional operating parameters of the equipment or from mismatching the variable speed drive with the motor.

The contents of this User Guide are believed to be correct at the time of printing. In the interests of a commitment to a policy of

continuous development and improvement, the manufacturer reserves the right to change the specification of the product or its

performance, or the contents of the User Guide, without notice.

mechanical including photocopying, recording or by an information storage or retrieval system, without permission in writing

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Drive firmware version

This product is supplied with the latest firmware version. If this drive is to be connected to an existing system or machine, all

drive firmware versions should be verified to confirm the same functionality as drives of the same model already present. This

may also apply to drives returned from an Emerson Industrial Automation Service Centre or Repair Centre. If there is any doubt

please contact the supplier of the product. The firmware version of the drive can be checked by looking at Pr 11.029.

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The electronic variable-speed drives manufactured by Emerson Industrial Automation have the potential to save energy and

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The information contained in this User Guide is for guidance only and does not form part of any contract. The accuracy cannot

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Issue Number: 1

For patent and intellectual property related information please go to: www.ctpatents.info.

Page | 3

This User Guide provides information for installing and operating the drive in Low voltage DC mode. The

information is in logical order for designing, configuration set up and operation. Chapter 1 Safety

information contains general safety information it is essential that the warnings are observed and the

information considered when designing and working with a system.

Contents

1 Safety Information........................................................................................................

1.1 Warnings, Cautions and Notes............................................................................................................

1.2 Electrical safety - general warning.......................................................................................................

1.3 System design and safety of personnel...............................................................................................

1.4 Access .................................................................................................................................................

1.5 Compliance with regulations................................................................................................................

1.6 Motor ...................................................................................................................................................

1.7 Adjusting parameters...........................................................................................................................

1.8 Electrical installation ............................................................................................................................

2 Introduction ..................................................................................................................

2.1 Modes of operation..............................................................................................................................

2.2 Power supplies ....................................................................................................................................

2.3 External components...........................................................................................................................

2.4 Low voltage DC operation ...................................................................................................................

3 Low Voltage DC Operation ..........................................................................................

3.1 Low voltage DC mode .........................................................................................................................

3.2 Low under voltage threshold select .....................................................................................................

3.3 AC supply mode with seem-less transition to Low voltage DC mode + contactor control...................

3.4 External user 24 Vdc for Low voltage DC mode..................................................................................

3.5 Running the motor ...............................................................................................................................

4 Parameter Section........................................................................................................

Single line descriptions........................................................................................................................

Detailed parameter descriptions..........................................................................................................

5 Electrical Installation ...................................................................................................

5.1 Power connections ..............................................................................................................................

5.2 AC supply requirements ......................................................................................................................

5.3 DC supply requirements ......................................................................................................................

5.4 External user 24 Vdc supply requirements..........................................................................................

5.5 Ground connections ............................................................................................................................

6 System Design..............................................................................................................

6.1 Low voltage DC supply........................................................................................................................

6.2 AC, DC supply fuse protection ............................................................................................................

6.3 External AC supply contactor ..............................................................................................................

6.4 External soft start circuit ......................................................................................................................

6.5 Systems configurations .......................................................................................................................

6.6 Important considerations .....................................................................................................................

7 Diagnostics ...................................................................................................................

7.1 Keypad ................................................................................................................................................

7.2 Trip indications ....................................................................................................................................

7.3 Displaying trip history ..........................................................................................................................

7.4 Behaviour of drive when tripped............................................................................................

7.5 Trouble shooting and identifying faults ...................................................................................

8 Index ..............................................................................................................................

Page | 4

1 Safety Information

1.1 Warnings, Cautions and Notes

1.2 Electrical Safety – General warning

The voltages used in the drive can cause severe electrical shock and/or burns, and could be lethal.

Extreme care is necessary at all times when working with or adjacent to the drive. Specific warnings

are given at the relevant places in this User Guide.

1.3 System Design and Safety of personnel

The drive is intended as a component for professional incorporation into complete equipment or a

system. If installed incorrectly, the drive may present a safety hazard.

The drive uses high voltage and current and carries a high level of stored electrical energy which can

cause injury. Close attention is required to the electrical installation and the system design to avoid

hazards either in normal operation or in the event of equipment malfunction. System design,

installation, commissioning and maintenance must be carried out by personnel who have the

necessary training and experience. They must read this safety information and this User Guide

carefully.

The STOP and Safe Torque Off (STO) function on the drive provides a highly secure method for

preventing the motor from being driven when the Safe Torque Off (STO), Drive enable signal is

absent. The Safe Torque Off (STO) input does not offer electrical safety. Before any work is

performed on the installation the AC supply and Low voltage DC supply have to be isolated by an

approved electrical isolation device for at least 10 minutes to allow the drives internal capacitors to

fully discharge.

With the sole exception of the Safe Torque Off (STO) none of the drive functions must be used

to ensure safety of personnel, i.e. they must not be used for safety related functions.

Careful consideration must be given to the functions of the drive which might result in a hazard, either

through their intended behaviour or through incorrect operation due to a fault. In any application

where a malfunction of the drive or its control system could lead to or allow damage, loss or injury, a

risk analysis must be carried out, and where necessary, further measures taken to reduce the risk, for

example, an over-speed protection device in case of failure of the speed control, or a fail-safe

mechanical brake in case of loss of motor braking.

The Safe Torque Off (STO) function may be used in a safety related application. The system designer

is responsible for ensuring that the complete system is safe and designed correctly according to the

relevant safety standards.

1.4 Access

Drive access must be restricted to authorized personnel only. Safety regulations which apply at the

place of use must be complied with.

1.5 Compliance with regulations

The installer is responsible for complying with all relevant regulations, such as national wiring

regulations, accidental prevention regulations and electromagnetic compatibility (EMC) regulations.

Page | 5

Particular attention must be given to the cross-sectional areas of conductors, the selection of fuses or

other protection, and protective ground (PE) connections.

The Elevator drive User Guide contains instruction for achieving compliance with specific EMC

standards.

Within the European Union, all machinery in which this product is used must comply with the following

directives:

•2006/42/EC: Safety of machinery.

•2014/30/EU: Electromagnetic Compatibility (EMC) Directive

1.6 Motor

Low speed operation may cause the motor to overheat where the cooling fan becomes less effective.

The motor should be fitted with a protection thermistor. If necessary, an electric forced vent fan should

be used.

Synchronous, permanent magnet servo motors can alone generate electrical power if they are rotated

this can result in the drive becoming energised through the motor terminal connections even when the

supply to the drive is disconnected.

The motor must be isolated from the drive before gaining access to any potential live parts.

1.7 Adjusting parameters

Some parameters have a profound effect on the operation of the drive. They must not be altered

without careful consideration of the impact of the controlled system. Measures must be taken to

prevent unwanted changes due to error or tampering.

1.8 Electrical installation

1.8.1 Electrical shock risk

The voltages present in the following locations can cause severe electric shock which may be lethal;

•AC supply cables and connections

•DC supply cables and connections

•Braking resistor cables and connections

•Output motor cables and connections

•Many internal parts of the drive, and external options

Before any work is performed on the installation the AC supply and Low voltage DC supply have to be

isolated by an approved electrical isolation device for at least 10 minutes to avoid the risk of severe

electric shock which may be lethal.

Unless otherwise indicated, control terminals are single insulated and must not be touched.

1.8.2 Stored charge

The drive contains capacitors that remain charged to a potentially lethal voltage after the AC supply,

or Low voltage DC supply has been disconnected. If the drive has been energised, the supply must

be isolated for at least ten minutes before work may continue.

Page | 6

2 Introduction

Before reading this document it is assumed that the user is familiar with the drives documentation.

This User Guide details configuration and operation of the drive with a Low voltage DC supply in an

Elevator system.

2.1 Modes of operation

There are three basic configurations of operation supported on the drive for either the AC supply or

the Low voltage DC supply as detailed following.

1: AC supply

Standard operation with the AC supply + optional external user 24 Vdc for Control PCB backup and

supplementing the drives internal 24 Vdc supply

2: Low voltage DC through selection of Low under voltage threshold

Backup operation with a Low voltage DC supply selecting the Low under voltage threshold, or as

required in some low power applications, continuous operation from a Low voltage DC supply. Control

over the transition between the AC supply and Low voltage DC supply must be managed externally

within the system for correct and safe operation. An external user 24 Vdc is required for operation.

3: Low voltage DC using on-board control the to manage seem-less control

Backup operation with a Low voltage DC supply, using the additional control on-board the drive which

can manage the external contactor control for correct seem-less transition from the AC supply to Low

voltage DC supply (the drive must be disabled to transition from Low voltage DC mode to AC mode

for drive frame sizes 3 to 6, this allows the internal soft start circuit to manage the inrush). An external

user 24 Vdc is required for operation.

NOTE:

It is important to consider pre charging of the drive when applying either the AC or the Low voltage

DC power supplies, and during transitioning between power supplies.

Operating modes

Mode

Pr 06.072

User Supply

Select

(external user

24 Vdc

supply)

Pr 06.068 Low

Voltage DC

Mode Enable

Pr 06.067

Low Under

Voltage

Threshold

Select

Operation

AC supply mode On (1) Off (0) Off (0)

AC supply mode, uses standard under

voltage threshold, optional external

user 24 Vdc supply for backup of

Control PCB and, or supplement

drives internal 24 Vdc supply

Low voltage DC

mode Off (0) Off (0) On (1)

Operation with Low voltage DC mode

selecting Low under voltage threshold,

external user 24 Vdc supply required

for Control PCB (frame 3 and larger),

Power Stage (frame 6 and larger),

heatsink fans (frame 9 and larger)

AC supply mode

transition to Low

voltage DC

supply mode

with external

contactor control

Off (0) On (1) Off (0)

AC supply mode with standard under

voltage threshold and seem-less

transition to Low voltage DC mode

with Low under voltage threshold

(drive must be disabled to transition

from Low voltage DC mode to AC

mode for frame sizes 3 to 6), external

user 24 Vdc supply required for

Control PCB (frame 3 and larger),

Power Stage (frame 6 and larger),

heatsink fans (frame 9 and larger)

Page | 7

2.2 Power supplies

For Low voltage DC operation an external DC supply is required which could be in the form of a UPS

or external batteries. The length of time that the drives and system will be able to operate and run the

motor will be dependent upon the Elevator system supply requirements along with the battery

capacity.

•For Low voltage DC operation drive frame sizes 3 and larger require an external user 24 Vdc

supply connected to the Control PCB to power the drive control stage.

•For drive frame sizes 6 and larger the external user 24 Vdc supply is required for the Power Stage

dependent upon the final DC Bus voltage level. If the DC Bus is below the AC supply loss level

(refer to section 5.3) this is required.

•For drive frame sizes 9 and larger the external user 24 Vdc supply is also required for the

heatsink cooling fans dependent upon the final DC Bus voltage level. If the DC Bus is below the

AC supply loss level (refer to section 5.3) this is required.

Vac supply ratings

Drive model AC supply voltage range

200 Vac 200 to 240 + 10 %

400 Vac 380 to 480 + 10 %

575 Vac 500 to 575 + 10 %

690 Vac 500 to 690 + 10 %

For standard AC operation the supply must be within the allowable operating range specified for the

given drive model as detailed in the Drive User Guide. It is possible that for 200 V products installed in

low power systems that these could be supplied from either a three phase or single phase supply.

DC supply range

DC supply voltage operating range (Vdc)

Drive model Min Max Over voltage

200 Vac 24 339 415

400 Vac 24 679 830

575 Vac 24 813 990

690 Vac 24 976 1190

The allowable DC voltage for Low voltage DC operation is as detailed above. Where the Low voltage

DC supply is in the form of a battery / UPS the length of time that the drive and system will be able to

operate and run the motor will be dependent upon the Elevator system supply requirements along

with the battery capacity.

External user 24 Vdc supply specification

External user 24 Vdc supply requirements

Nominal operating 24.0 Vdc

Minimum operating (Frame 6)

(Frame 3 to 5 & 7 to 10)

18.6 Vdc

19.2 Vdc

Maximum operating (Frame 3 to 6)

(Frame 7 to 10)

28.0 Vdc

30.0 Vdc (IEC), 26.0 Vdc (UL)

Minimum start-up

voltage

(Frame 6)

(Frame 3 to 5 & 7 to 10)

18.4 Vdc

21.6 Vdc

Maximum power (Frame 3 to 6)

(Frame 7 to 10)

40 W

60 W

Recommended fuse (Frame 3 to 5)

(Frame 6 to 10)

3A, 50 Vdc

4A, 50 Vdc

For drive frame sizes 3 and larger an external user 24 Vdc supply is required to power the drive

Control PCB of the drive during Low voltage DC operation. The 24 Vdc supply will maintain power on

the Control PCB when the AC supply is no longer present during operation in Low voltage DC mode,

or, also whilst the system is in energy saving, sleep mode.

Page | 8

The external user 24 Vdc supply is also required for drive frame sizes 6 and larger for the Power

Stage dependent upon the final DC Bus voltage level. If the DC Bus is below the AC supply loss level

this is required.

For drive frame sizes 9 and larger the external user 24 Vdc supply is also required for the heatsink

cooling fans dependent upon the final DC Bus voltage level. If the DC Bus is below than the AC

supply loss level this is required.

Power Stage external user 24 Vdc supply, drive frame sizes 6 and larger, Low voltage DC mode

External user 24 Vdc supply

Drive model DC Bus (Vdc)

200 Vac Vdc < 205

Connect external user 24 Vdc supply to Power Stage

400 Vac Vdc < 410

575 Vac Vdc < 540

690 Vac Vdc < 540

2.3 External components

The drive in Low voltage DC mode uses external contactors for selection of the power supply, these

power supplies being the AC supply, Low voltage DC supply, UPS supply and External user 24 Vdc

supply.

The external contactors are also required to support the drives seem-less external contactor control

for safe operation from the AC supply to the Low voltage DC supply, refer to System 3 and System 4

in section 6.5 for further details and Pr 06.068, Pr 06.069 and Pr 06.070. During operation in Low

voltage DC mode contactor feedback is required to support the transition between the AC supply and

the Low voltage DC supply by the drive. Alternatively the transition between the AC supply and the

Low voltage DC supply can be managed by the Elevator controller.

NOTE:

It is important to consider pre charging of the drive when applying either the AC or the Low voltage

DC power supplies, and during transitioning between power supplies.

2.3.1 Drive frame sizes 3 to 6

The external contactor control on the drive is setup to control the AC supply contactor for operation

with frame sizes 3 to 6, managing the transition from the AC supply to the Low voltage DC supply.

The inrush from the AC supply and the Low voltage DC supply is managed on the power stage of the

drive with an internal inrush circuit.

During the transition from the Low voltage DC supply back to the AC supply the drives internal soft

start circuit relay must be in circuit (drive in Under Voltage state) drive disabled, to manage the inrush

current for when the AC supply is reapplied.

For operation with a UPS the external contactor control is managed by the Elevator controller to

connect and disconnect both the AC supply and the UPS supply with both of these being

synchronized. The inrush from the AC supply and the UPS supply are managed on the drive with an

internal inrush circuit.

2.3.2 Drive frame sizes 7 and larger

The external contactor control on the drive is setup to control a DC supply contactor for operation with

drive frame sizes 7 and larger, managing the transition from the AC supply to the Low voltage DC

supply. The inrush from the AC supply is managed through the drives half controlled rectifier, the

inrush from a Low voltage DC supply connected directly to the drives DC Bus must be managed with

an external soft start circuit.

During the transition from the Low voltage DC supply back to the AC supply the drives half controlled

rectifier will manage the inrush current when the AC supply is reapplied. The external soft start circuit

is required to manage the inrush current for when the Low voltage DC supply is applied.

Page | 9

For operation with a UPS the external contactors are managed by the Elevator controller to connect

and disconnect both the AC supply and UPS supply, both of these being synchronized. The AC

supply and UPS supply inrush current is managed through the drives half controlled rectifier.

2.3.3 Contactor control

The contactor control for the transition from the AC supply to Low voltage DC supply can be managed

locally by the drive when operating in Low voltage DC mode using the on-board control to manage

seem-less control Pr 06.068 -Low Voltage DC Mode Enable = On (1).

Alternatively when operating in Low voltage DC mode the transition from the AC supply to the Low

voltage DC supply can be managed externally by the Elevator controller. In the instance the Elevator

controller is managing the transition using Pr 06.067 -Low Under Voltage Threshold = On (1). The

transition from the AC supply to Low voltage DC supply must consider, and manage the inrush

current when connecting power supplies, for drive frame sizes 7 and larger using an external soft start

circuit. Pr 06.067 -Low Under Voltage Threshold can also be managed by the Elevator controller

selecting based upon the active power supply.

NOTE:

It is important to consider pre charging of the drive when applying either the AC or the Low voltage

DC power supply, and during transitioning between power supplies.

2.4 Low voltage DC operation

Low voltage DC operation is available on all drives, and can typically be used to support the following

modes of operation in Elevator systems.

2.4.1 Low voltage DC mode for Rescue operation

Low voltage DC mode is used to provide rescue operation for the Elevator system where the AC

supply is no longer available. This operation requires the Low voltage DC supply or UPS to deliver

power to the drive, Elevator controller and motor along with motor contactors, brakes, auxiliary

components, which could include door controller and car lighting etc. The Low voltage DC supply for

rescue operation is rated to supply the complete Elevator system, and deliver the required operating

power to the motor. The Low voltage DC supply could come from either

a) DC battery supply system connected directly to the drives DC Bus

b) UPS system connected via the drives AC rectifier input stage

Low voltage DC supply

•Pre charging of the drive when first applying the AC supply for drive frame sizes 3 to 6 will be

using the drives internal soft start circuit.

- Transitioning from the AC supply to the Low voltage DC supply where the DC Bus is already

charged does not require any soft start to be active

- During a transitioning from the Low voltage DC supply to the AC supply the drive must be in

the Under Voltage state where the soft start circuit is active to limit the AC inrush current.

- Connecting the Low voltage DC supply where the DC Bus is discharged will use the drives

internal soft start circuit.

•Pre charging of the drive when first applying the AC supply for drive frame sizes 7 and larger will

be using the drives half controlled rectifier.

- Transitioning from the AC supply to the Low voltage DC supply where the DC Bus is already

charged does not require any pre-charging

- During a transitioning from the Low voltage DC supply to the AC supply the drives half

controlled rectifier will limit the AC inrush current.

- Pre charging for the Low voltage DC supply where the DC Bus is discharged requires an

external soft start circuit.

UPS supply

•Pre charging of the drive when first applying the AC supply for drive frame sizes 3 to 6 will be

using the drives internal soft start circuit.

- Transitioning from the AC supply to the UPS supply where the DC Bus is already charged

does not require any soft start to be active

Page | 10

- During a transitioning from the UPS supply to the AC supply the drive must be in the Under

Voltage state where the soft start circuit is active to limit the AC inrush current.

- Connecting the UPS supply where the DC Bus is discharged will use the drives internal soft

start circuit.

•Pre charging of the drive when first applying the AC supply for drive frame sizes 7 and larger will

be using the drives half controlled rectifier.

- Transitioning from the AC supply to the UPS supply where the DC Bus is already charged

does not require any pre-charging

- During a transitioning from the UPS supply to the AC supply the drives half controlled rectifier

will limit the AC inrush current.

- Pre charging for the UPS supply where the DC Bus is discharged will use the drives half

controlled rectifier.

2.4.2 Low voltage DC mode continuous operation

Low voltage DC mode is used for normal operation of the Elevator system. The Low voltage DC

supply delivers full power to the drive, Elevator controller and Motor along with motor contactors,

brakes, auxiliary components which could include door controller and car lighting etc. The Low

voltage DC supply for continuous operation is rated to supply the complete system, and deliver full

power to the motor. The Low voltage DC supply could come from either

c) DC battery supply system connected directly to the drives DC Bus

d) UPS system connected via the drives AC rectifier input stage

Low voltage DC supply

•Pre charging of the drive when first applying the Low voltage DC supply for drive frame sizes 3 to

6 will be using the drives internal soft start circuit.

•The drives internal soft start circuit is active when the drive is in the Under Voltage state

•Pre charging of the drive when first applying the Low voltage DC supply for drive frame sizes 7

and larger requires an external soft start circuit.

•The external soft start circuit should be designed around the external Low voltage DC supply

UPS supply

•Pre charging of the drive when first applying the UPS supply for drive frame sizes 3 to 6 will be

using the drives internal soft start circuit.

•The drives internal soft start circuit for the UPS supply is active once the drive is in the Under

Voltage state

•Pre charging of the drive when first applying the UPS supply for drive frame sizes 7 and larger will

be using the drives half controlled rectifier.

•The drives half controlled rectifier is active once the UPS supply is applied.

NOTE:

During operation in Low voltage DC mode where the Low under voltage threshold is selected there is

no power down parameter save carried out, any parameter save must be carried out prior to power

down parameter mm.xxx = 1001

NOTE:

If the external 24Vdc is permanently connected to the drive and powering the control stage there will

be no power down save carried out, any parameter save must be carried out prior to power down

parameter mm.xxx = 1001

Page | 11

3 Low Voltage DC Operation

Following is an example of a drive system electrical panel with an AC supply for normal operation.

The AC supply in this system could be for example a 200 V, or 400 V supply and is used to supply all

components within the electrical panel including the drive and Elevator controller, Motor contactors

and brake along with Elevator car and associated controls such as door controller, lighting etc... In

some lower power Elevator systems the AC supply could be a single phase AC supply for systems

such as Home Elevators.

In the following example the external user 24 Vdc supply is connected to the drive to provide back up

for the Control PCB and to supplement the drives internal 24 Vdc supply.

Pr 06.072 -User Supply Select (external user 24 Vdc supply) On (1)

Pr 06.068 - Low Voltage DC Supply Mode Enable Off (0)

Pr 06.067 - Low Under Voltage Threshold Select Off (0)

For operation with the AC supply the minimum Standard Under Voltage Threshold (Pr 06.065) is 175

Vdc (200 V drive) 330 Vdc (400 V drive) and 435 Vdc (575, 690 V drive)

Elevator system with AC supply

Elevator

Controller

Drive

Brake

controller

MCB

Braking resistor

Rescue

control

Lift car

and shaft

Lighting

MCBMCB

3-phase

Vac power

supply

Power supply to

Elevator system

Electrical panel

Power to

motor

Power supply to

motor brakes

Elevator system Electrical panel

(Drive + Controller + Auxiliary devices)

TRX

Filter

Reactor

Backup supply

External

24 Vdc

Under normal operation the maximum voltage transient that can be re-applied without controlling the

charging current (soft start circuit inactive) is, Peak Rectified AC voltage – Pr 06.065 Standard Under

Voltage Threshold = Max Voltage Transient

This situation could occur for example during a supply brownout.

•Minimum Under voltage threshold for a 400 V drive is 330 Vdc

•Maximum allowed supply voltage for a 400 V drive is 480 + 10 %

•Peak of the maximum allowed supply voltage = 480 x 1.1 x √2 = 747 Vdc

•Difference between under voltage threshold and the peak supply voltage = 747 - 330 = 417 Vdc.

•Therefore, when Pr 06.068 - Low Voltage DC Supply Mode Enable = Off (0) for a 400 V drive,

the peak supply voltage must never exceed Pr 06.066 -Low Under Voltage Threshold + 417 Vdc

•On a 400 V supply Pr 06.066 -Low Under Voltage Threshold can be reduced to =

(400 x 1.1 x √2 ) – 417 = 205 Vdc without having to add an external contactor.

Page | 12

AC supply ratings

Drive

model AC supply voltage rating

Pr 06.065 –

Standard Under

Voltage Threshold

Supply loss

level

200 Vac 200 to 240 + 10 % 175 205

400 Vac 380 to 480 + 10 % 330 410

575 Vac 500 to 575 + 10 % 435 540

690 Vac 500 to 690 + 10 % 435 540

The AC supply in the example above will be rated to deliver full power to the complete Elevator

system.

Where Pr 06.067 - Low Under Voltage Threshold Select = Off (0) the under voltage threshold is

defined by Pr 06.065 - Standard Under Voltage Threshold. If Pr 06.067 - Low Under Voltage

Threshold Select = On (1) then the under voltage threshold is defined by Pr 06.066 -Low Under

Voltage Threshold.

During operation with the AC supply, backup operation for the Control PCB is possible with an

external user 24 Vdc supply. This 24 Vdc supply can also be used to supplement the drives own

internal 24 Vdc supply. In this case setting Pr 06.072 -User Supply Select (external user 24 Vdc

supply) = On (1) will generate a drive trip if the external user 24 Vdc supply is lost, where

Pr 06.072 -User Supply Select (external user 24 Vdc supply) = Off (0) no drive trip is generated on

loss of the 24 Vdc supply.

AC Supply and Braking

* In the above figure Pr 06.072 - User Supply Select = On (1) in this example the external user

24 Vdc supply is connected and is being used to back-up the Control PCB, and supplement the

drives internal 24 Vdc supply.

Page | 13

AC Supply Under Voltage Timing

NOTE:

Power down save is carried out when the DC Bus voltage passes Pr 06.065 - Standard Under

Voltage Threshold in either direction.

NOTE:

If the external 24Vdc is permanently connected to the drive and powering the control stage there will

be no power down save carried out, any parameter save must be carried out prior to power down with

parameter mm.xxx = 1001

3.1 Low Voltage DC Mode

Any drive can be configured for Low voltage DC operation however there are differences in the

electrical connections and operating voltage range depending on the drive frame size. When set up

for Low voltage DC operation the drive can deliver rated torque to the motor, up to the speed which

can be supported from the Low Voltage DC supply.

Low voltage DC operation is primarily intended for rescue operation following failure of the AC supply.

It is also possible to use Low voltage DC mode for continuous operation of the drive in low power low

applications such as Home Elevators.

Where the Low voltage DC supply is in the form of a battery / UPS the length of time that the drive

and system will be able to operate and run the motor will be dependent upon the Elevator system

supply requirements along with the battery capacity.

Low voltage DC operation can be used whilst operating in any of the following modes:

•Open loop mode (Fixed boost and Open loop vector modes) with an asynchronous motor

•RFC-A closed loop vector with an asynchronous motor

•RFC-S closed loop servo with an synchronous PM servo motor

3.2 Low under voltage threshold select

In this mode of operation the user defines Pr 06.066 -Low Under Voltage Threshold based upon the

Low voltage DC supply and selects this through setting Pr 06.067 - Low Under Voltage Threshold

Select = On (1). All contactor sequencing required to switch from the AC supply to the Low voltage

DC supply, must be managed external to the drive within the system ensuring that the inrush current

is managed correctly. An external user 24 Vdc supply is required.

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Pr 06.072 -User Supply Select (external user 24 Vdc supply) Off (0)

Pr 06.068 - Low Voltage DC Supply Mode Enable Off (0)

Pr 06.067 - Low Under Voltage Threshold Select On (1)

Elevator system with Low voltage DC supply

Elevator

Controller

Drive

Brake

controller

MCB

Braking resistor

Rescue

control

Lift car

and shaft

Lighting

MCBMCB

3-phase

Vac power

supply

Power supply to

Elevator system

Electrical panel

Power to

motor

Power supply to

motor brakes

Elevator system Electrical panel

(Drive + Controller + Auxiliary devices)

TRX

Filter

Reactor

Single phase

UPS system

Battery backup

supply

220 Vac UPS

Battery solution

72 Vdc

Backup supply

External

24 Vdc

The figure above shows Low voltage DC mode where the supply to the electrical panel and drive is

from either the single phase UPS system or the Battery backup supply and the additional external

user 24 Vdc supply is being supplied to the drive. During operation in Low Voltage DC Mode the

external user 24 Vdc supply should also be connected to (1) the drives Control PCB (2) the Power

Stage (drive frame sizes 6 and larger) and (3) the Heatsink cooling fans (drive frame sizes 9 and

larger).

DC supply range

DC supply voltage operating range (Vdc) Pr 06.066 –

Low Under

Voltage Threshold

Pr 06.065 –

Standard Under

Voltage Threshold

Drive model Min Max Over Voltage

200 Vac 24 339 415 24 ⇒175 175

400 Vac 24 679 830 24 ⇒330 330

575 Vac 24 813 990 24 ⇒435 435

690 Vac 24 976 1190 24 ⇒435 435

If Pr 06.067 - Low Under Voltage Threshold Select = Off (0) then the under voltage threshold is

defined by Pr 06.065 - Standard Under Voltage Threshold and is typically associated to operation

with the AC supply. If Pr 06.067 - Low Under Voltage Threshold Select = On (1) then the under

voltage threshold is defined by Pr 06.066 -Low Under Voltage Threshold which is set-up for the Low

voltage DC supply. The minimum Pr 06.066 -Low Under Voltage Threshold for Low Voltage DC

Mode is 24 Vdc.

Under normal operation the maximum voltage transient that can be re-applied without controlling the

charging current (soft start circuit inactive) is, Peak Rectified AC voltage - Pr 06.065 - Standard Under

Voltage Threshold = Max Voltage Transient.

Page | 15

This situation could occur for example during a power supply brownout.