Delta Electronics VFD-VL User Manual

Preface

Thank you for choosing DELTA’s high-performance VFD-VL Series. The VFD-VL Series is manufactured with high-quality components and materials and incorporates the latest microprocessor technology available.

This manual is to be used for the installation, parameter setting, troubleshooting, and daily maintenance of the AC motor drive. To guarantee safe operation of the equipment, read the following safety guidelines before connecting power to the AC motor drive. Keep this operating manual at hand and distribute to all users for reference.

To ensure the safety of operators and equipment, only qualified personnel familiar with AC motor drive are to do installation, start-up and maintenance. Always read this manual thoroughly before using VFD-VL series AC Motor Drive, especially the WARNING, DANGER and CAUTION notes. Failure to comply may result in personal injury and equipment damage. If you have any questions, please contact your dealer.

PLEASE READ PRIOR TO INSTALLATION FOR SAFETY.

DANGER!

1. AC input power must be disconnected before any wiring to the AC motor drive is made.

2. A charge may still remain in the DC-link capacitors with hazardous voltages, even if the power

has been turned off. To prevent personal injury, please ensure that power has turned off before

opening the AC motor drive and wait ten minutes for the capacitors to discharge to safe voltage

levels.

3. Never reassemble internal components or wiring.

4. The AC motor drive may be destroyed beyond repair if incorrect cables are connected to the

input/output terminals. Never connect the AC motor drive output terminals U/T1, V/T2, and

W/T3 directly to the AC mains circuit power supply.

5. Ground the VFD-VL using the ground terminal. The grounding method must comply with the

laws of the country where the AC motor drive is to be installed. Refer to the Basic Wiring

Diagram.

6. VFD-VL series is used only to control variable speed of 3-phase induction motors, NOT for 1-

phase motors or other purpose.

7. VFD-VL series shall NOT be used for life support equipment or any life safety situation.

WARNI NG!

1. DO NOT use Hi-pot test for internal components. The semi-conductor used in AC motor drive

easily damage by high-voltage.

2. There are highly sensitive MOS components on the printed circuit boards. These components

are especially sensitive to static electricity. To prevent damage to these components, do not

touch these components or the circuit boards with metal objects or your bare hands.

3. Only qualified persons are allowed to install, wire and maintain AC motor drives.

CAUTION!

1. Some parameters settings can cause the motor to run immediately after applying power.

2. DO NOT install the AC motor drive in a place subjected to high temperature, direct sunlight,

high humidity, excessive vibration, corrosive gases or liquids, or airborne dust or metallic

particles.

3. Only use AC motor drives within specification. Failure to comply may result in fire, explosion or

electric shock.

4. To prevent personal injury, please keep children and unqualified people away from the

equipment.

5. When the motor cable between AC motor drive and motor is too long, the layer insulation of the

motor may be damaged. Please use a frequency inverter duty motor or add an AC output

reactor to prevent damage to the motor. Refer to appendix B Reactor for details.

6. The rated voltage for AC motor drive must be ≤ 240V (≤ 480V for 460V models) and the mains supply current capacity must be ≤ 5000A RMS (≤10000A RMS for the ≥ 40hp (30kW) models)

Preface ............................................................................................................. i

Table of Contents .......................................................................................... iii

Chapter 1 Introduction................................................................................ 1-1

1.1 Receiving and Inspection ...................................................................1-2

1.1.1 Nameplate Information................................................................ 1-2

1.1.2 Model Explanation ...................................................................... 1-2

1.1.3 Series Number Explanation ........................................................ 1-3

1.1.4 Drive Frames and Appearances ................................................. 1-3

1.1.5 Drive Features ............................................................................ 1-5

1.2 Preparation for Installation and Wiring ............................................... 1-6

1.2.1 Ambient Conditions..................................................................... 1-6

1.2.2 Remove Front Cover................................................................... 1-7

1.2.3 Lifting .......................................................................................... 1-8

1.2.4 Flange Mounting ......................................................................... 1-9

1.2.5 Cutout Dimensions.................................................................... 1-11

1.3 Dimensions....................................................................................... 1-13

Chapter 2 Installation and Wiring ..............................................................2-1

2.1 Wiring ................................................................................................. 2-1

2.2 External Wiring ................................................................................... 2-6

2.3 Main Circuit ........................................................................................2-7

2.3.1 Main Circuit Connection .............................................................. 2-7

2.3.2 Main Circuit Terminals................................................................. 2-9

2.4 Control Terminals .............................................................................2-10

Chapter 3 Operation and Start Up ..............................................................3-1

3.1 Operation Method ...............................................................................3-1

3.2 Trial Run .............................................................................................3-3

3.3 Auto-tuning Operations .......................................................................3-4

3.3.1 Flow Chart...................................................................................3-4

3.3.2 Explanations for the Auto-tuning Steps ....................................... 3-5

3.3.2.1 Step 1 .................................................................................. 3-5

3.3.2.2 Step 2 .................................................................................. 3-7

3.3.2.3 Step 3 .................................................................................. 3-9

3.3.2.4 Step 4 ................................................................................ 3-11

3.3.2.5 Step 5 ................................................................................ 3-13

3.3.2.6 Step 6 ................................................................................ 3-13

Chapter 4 Parameters..................................................................................4-1

4.1 Summary of Parameter Settings......................................................... 4-2

4.2 Description of Parameter Settings ....................................................4-20

Chapter 5 Troubleshooting.........................................................................5-1

5.1 Over Current (OC) ..............................................................................5-1

5.2 Ground Fault.......................................................................................5-2

5.3 Over Voltage (OV) ..............................................................................5-2

5.4 Low Voltage (Lv).................................................................................5-3

5.5 Over Heat (OH)...................................................................................5-4

5.6 Overload ............................................................................................. 5-4

5.7 Display of KPVL-CC01 is Abnormal ................................................... 5-5

5.8 Phase Loss (PHL) ..............................................................................5-5

5.9 Motor cannot Run............................................................................... 5-6

5.10 Motor Speed cannot be Changed..................................................... 5-7

5.11 Motor Stalls during Acceleration....................................................... 5-8

5.12 The Motor does not Run as Expected .............................................. 5-8

5.13 Electromagnetic/Induction Noise ...................................................... 5-9

5.14 Environmental Condition ..................................................................5-9

5.15 Affecting Other Machines ............................................................... 5-10

Chapter 6 Fault Code Information and Maintenance................................ 6-1

6.1 Fault Code Information....................................................................... 6-1

6.1.1 Common Problems and Solutions............................................... 6-2

6.1.2 Reset .......................................................................................... 6-9

6.2 Maintenance and Inspections........................................................... 6-11

Appendix A Specifications ........................................................................ A-1

Appendix B Accessories ........................................................................... B-1

B.1 All Brake Resistors & Brake Units Used in AC Motor Drives..............B-2

B.1.1 Dimensions and Weights for Brake Resistors ............................ B-4

B.1.2 Specifications for Brake Unit ......................................................B-6

B.1.3 Dimensions for Brake Unit..........................................................B-7

B.2 Non-fuse Circuit Breaker Chart ..........................................................B-9

B.3 Fuse Specification Chart ....................................................................B-9

B.4 AC Reactor ......................................................................................B-11

B.4.1 AC Input Reactor Recommended Value................................... B-11

B.4.2 AC Output Reactor Recommended Value ................................B-11

B.4.3 Applications for AC Reactor......................................................B-12

B.5 Zero Phase Reactor (RF220X00A) ................................................. B-15

B.6 DC Choke Recommended Values................................................... B-16

B.7 Digital Keypad KPVL-CC01............................................................. B-17

B.7.1 Description of the Digital Keypad KPVL-CC01 .........................B-17

B.7.2 How to Operate the Digital Keypad KPVL-CC01 ......................B-19

B.7.3 Dimension of the Digital Keypad...............................................B-21

B.7.4 Recommended Position the Rubber Magnet of the Digital Keypad

...........................................................................................................

B.8 PG Card (for Encoder) .................................................................... B-22

B.8.1 EMVL-PGABL...........................................................................B-22

B.8.2 EMVL-PGABO ..........................................................................B-25

B.8.3 EMVL-PGH01 (only for Heidenhain ERN1387) ........................B-28

B.8.4 EMVL-PGS01 ...........................................................................B-32

B.9 AMD-EMI Filter Cross Reference .................................................... B-36

B-21

B.9.1 Dimensions ...............................................................................B-38

B.10 EMVL-IOA01 ................................................................................. B-43

B.11 Safety Relay EMVL-SAF01 ........................................................... B-44

B.11.1 Functions of the Terminals......................................................B-44

B.11.2 Wiring of the Safety Relay ......................................................B-44

Appendix C How to Select the Right AC Motor Drive.............................. C-1

C.1 Capacity Formulas ............................................................................C-2

C.2 General Precaution ...........................................................................C-4

C.3 How to Choose a Suitable Motor....................................................... C-5

Chapter 1 Introduction

The AC motor drive should be kept in the shipping carton or crate before installation. In order to retain the warranty coverage, the AC motor drive should be stored properly when it is not to be used for an extended period of time. Storage conditions are:

CAUTION!

1. Store in a clean and dry location free from direct sunlight or corrosive fumes.

2. Store within an ambient temperature range of -20

3. Store within a relative humidity range of 0% to 90% and non-condensing environment.

4. Store within an air pressure range of 86 kPA to 106kPA.

5. DO NOT place on the ground directly. It should be stored properly. Moreover, if the surrounding

environment is humid, you should put exsiccator in the package.

6. DO NOT store in an area with rapid changes in temperature. It may cause condensation and

frost.

7. If the AC motor drive is stored for more than 3 months, the temperature should not be higher

than 30 °C. Storage longer than one year is not recommended, it could result in the degradation

of the electrolytic capacitors.

8. When the AC motor drive is not used for longer time after installation on building sites or places

with humidity and dust, it’s best to move the AC motor drive to an environment as stated above.

C to +60 °C.

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Chapter 1 Introduction|

1.1 Receiving and Inspection

This VFD-VL AC motor drive has gone through rigorous quality control tests at the factory before shipment. After receiving the AC motor drive, please check for the following:

Check to make sure that the package includes an AC motor drive, the User Manual/Quick



Start and CD.

Inspect the unit to assure it was not damaged during shipment.



Make sure that the part number indicated on the nameplate corresponds with the part



number of your order.

1.1.1 Nameplate Information

Example for 15HP/11kW 230V 3-Phase AC motor drive

AC Drive Model

Input Spec.

Output Spec.

Output Frequency Range

Software version

Bar Code

Serial Number

1.1.2 Model Explanation

11 0

VFD A

MODEL

INPUT OUTPUT

Freq. Range

Version:00.90

:VFD110VL23A

:3PH 180-264V 50/60Hz 43A :3PH 0-230V 47A (LIFT DUTY)

41.1A(General) 11kW / 15HP :0~120Hz

110VL23AT7260002

Ver sion Type Mains Input Voltage 23: Three phase230V

43: Three phase460V

VFD-VL Series

Applicable motor capacity

055: 7 .5HP(5. 5kW) 075: 1 0 HP(7.5 kW) 110: 15 HP(11kW) 150: 2 0HP(15kW)

185: 25 HP(18.5kW)

220: 3 0 HP(22kW)

300: 4 0HP(30kW) 370: 5 0 HP(3 7kW) 450: 6 0 HP(4 5kW) 550: 7 5HP(55kW)

750: 100 H P(75k W)

Series Name ( ariable requency ri ve)VF D

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Chapter 1 Introduction|

1.1.3 Series Number Explanation

267T110VL23A

Production number

Production week

Production year 2007 Production factory

230V 3-phase 15HP(11kW)

(T: Taoyuan, W: Wujian)

Model

If the nameplate information does not correspond to your purchase order or if there are any problems, please contact your distributor.

1.1.4 Drive Frames and Appearances

7.5-15HP/5.5-11kW(Frame C) 20-30HP/15-22kW(Frame D)

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Chapter 1 Introduction|

40-100HP/30-75kW(Frame E)

Frame Power range Models

C 7.5-15HP (5.5-11kW)

D 20-30HP (15-22kW)

E (E1) 40-60hp (30-45kW) VFD300VL43A, VFD370VL43A, VFD450V43A

E (E2) 40-100hp (30-75kW)

Please refer to Chapter 1.3 for exact dimensions.

VFD055VL23A/43A, VFD075VL23A/43A, VFD110VL23A/43A

VFD150VL23A/43A, VFD185VL23A/43A, VFD220VL23A/43A

VFD300VL23A, VFD370VL23A, VFD550VL43A, VFD750VL43A

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Chapter 1 Introduction|

1.1.5 Drive Features

Communication Port

Internal structure Removable fan

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Chapter 1 Introduction|

1.2 Preparation for Installation and Wiring

1.2.1 Ambient Conditions

Install the AC motor drive in an environment with the following conditions:

Air Temperature: -10 ~ +45°C (14 ~ 113°F)

Relative Humidity: <90%, no condensation allowed

Operation

Storage

Transportation

Pollution Degree 2: good for a factory type environment.

Minimum Mounting Clearances

Atmosphere pressure: Installation Site Altitude:

Vibration:

Temperature: -20°C ~ +60°C (-4°F ~ 140°F)

Relative Humidity: <90%, no condensation allowed

Atmosphere pressure:

Vibration:

86 ~ 106 kPa

<1000m

<20Hz: 9.80 m/s2 (1G) max 20 ~ 50Hz: 5.88 m/s2 (0.6G) max

86 ~ 106 kPa

<20Hz: 9.80 m/s2 (1G) max 20 ~ 50Hz: 5.88 m/s2 (0.6G) max

Air Flow

7.5-20HP 75 (3) 175 (7)

25-75HP 75 (3) 200 (8)

100HP 75 (3) 250 (10)

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mm (inch)

Chapter 1 Introduction|

CAUTION!

1. Operating, storing or transporting the AC motor drive outside these conditions may cause

damage to the AC motor drive.

2. Failure to observe these precautions may void the warranty!

3. Mount the AC motor drive vertically on a flat vertical surface object by screws. Other directions

are not allowed.

4. The AC motor drive will generate heat during operation. Allow sufficient space around the unit

for heat dissipation.

5. The heat sink temperature may rise to 90°C when running. The material on which the AC motor

drive is mounted must be noncombustible and be able to withstand this high temperature.

6. When AC motor drive is installed in a confined space (e.g. cabinet), the surrounding

temperature must be within 10 ~ 40°C with good ventilation. DO NOT install the AC motor drive

in a space with bad ventilation.

7. Prevent fiber particles, scraps of paper, saw dust, metal particles, etc. from adhering to the

heatsink.

8. When installing multiple AC more drives in the same cabinet, they should be adjacent in a row

with enough space in-between. When installing one AC motor drive below another one, use a

metal separation between the AC motor drives to prevent mutual heating.

1.2.2 Remove Front Cover

7.5-15HP/5.5-11kW(frame C) & 20-30HP/15-22kW(frame D)

After removing the screws, please push the front cover to open it. For the open cover direction, please refer to the following picture.

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Chapter 1 Introduction|

40-100HP/30-75kW (frame E)

After removing the screws, please push the front cover to open it. For the open cover direction,

please refer to the following picture.

1.2.3 Lifting

Please carry only fully assembled AC motor drives as shown in the following.

For 40-100HP (Frame E)

Step 1 Step 2

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Chapter 1 Introduction|

Step 3 Step 4

1.2.4 Flange Mounting

Step 1: Please take out the 16 screws (8 screws for each top and bottom side of the drive) and remove the fixed plate 1 and fixed plate 2) as shown in the following figures.

5 6

fixed pla t e 1

1 2

fix ed pl at e 2

3 4

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Chapter 1 Introduction|

Step 2: place the 8 screws back in to secure the fixed plate 1 and fixed plate 2 (as shown in the following figures) with the following torque.

Frame C: 14-17kgf-cm [12.2-14.8in-lbf]

Frame D: 20-25kgf-cm [17.4-21.7in-lbf]

Frame E: 20-25kgf-cm [17.4-21.7in-lbf]

fixed plate 1

Step 3: Please notice that it doesn’t need to put those 8 screws shown in the following figures back to the drive. Moreover, please make sure that these 2 different fixed plates are put in the correct side as shown in the figures.

3 4

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1 2

fixed plate 2

5 6

3 4

Chapter 1 Introduction|

1.2.5 Cutout Dimensions

7.5-15HP/5.5-11kW (frame C)

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Chapter 1 Introduction|

20-30HP/15-22kW (frame D)

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Chapter 1 Introduction|

1.3 Dimensions

Frame C

Read the user manual before operation. Risk of electrical shock.Wait 10 minutes after removing power before servicing. Do not connect AC power to output terminals U/T1, V/T2 and W/T3. Use proper grounding techniques. Check to be sure that the voltage of the main AC power supply satisfies the rated voltage of the Inverter.

WARNING

Frame W W1 H H1 H2 H3 D Ø Ø1 Ø2 Ø3

Unit: mm [inch]

136

235

204

350

337

320

[9.25]

[8.03]

[13.78]

[13.27]

[12.60]

[5.35]

6.5

[0.26]

[1.34]

[0.87]

NOTE

Frame C: VFD055VL23A/43A, VFD075VL23A/43A, VFD110VL23A/43A

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Chapter 1 Introduction|

Frame D

WARNING

Unit: mm [inch]

Frame W W1 H H1 H2 H3 D Ø Ø1 Ø2 Ø3

255.0

226.0

403.8

384.0

360.0

21.9

168.0

8.5

[10.04]

[8.90]

[15.90]

[15.12]

[14.17]

[0.86]

[6.61]

[0.33]

[1.73]

NOTE

Frame D: VFD150VL23A/43A, VFD185VL23A/43A, VFD220VL23A/43A

[1.34]

[0.87]

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Chapter 1 Introduction|

Frame E

W D

Unit: mm [inch]

Frame W W1 H H1 H2 D D1 D2 S1 S2 S3

370.0

[14.57]

370.0

[14.57]

335.0

[13.19]

335.0

[13.19]

595.0

[23.43]

589.0

[23.19]

589.0

[23.19]

560.0

[22.05]

560.0

[22.05]

260.0

[10.24]

260.0

[10.24]

132.5

[5.22]

132.5

[5.22]

18.0

[0.71]

18.0

[0.71]

13.0

[0.51]

13.0

[0.51]

13.0

[0.51]

13.0

[0.51]

NOTE

Frame E1: VFD300VL43A, VFD370VL43A, VFD450VL43A

Frame E2: VFD300VL23A, VFD370VL23A, VFD550VL43A, VFD750VL43A

18.0

[0.71]

18.0

[0.71]

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Chapter 2 Installation and Wiring

After removing the front cover (see chapter 1.2.2 for details), check if the power and control terminals are clear. Be sure to observe the following precautions when wiring.

CAUTION!

1. Make sure that power is only applied to the R/L1, S/L2, T/L3 terminals. Failure to comply may

result in damage to the equipment. The voltage and current should lie within the range as

indicated on the nameplate.

2. Check the following items after finishing the wiring:

A. Are all connections correct?

B. No loose wires? C. No short-circuits between terminals or to ground?

DANGER!

1. A charge may still remain in the DC bus capacitors with hazardous voltages even if the power

has been turned off. To prevent personal injury, please ensure that the power is turned off and

wait ten minutes for the capacitors to discharge to safe voltage levels before opening the AC

motor drive.

2. All the units must be grounded directly to a common ground terminal to prevent lightning strike

or electric shock.

3. Only qualified personnel familiar with AC motor drives is allowed to perform installation, wiring

and commissioning.

4. Make sure that the power is off before doing any wiring to prevent electric shock.

2.1 Wiring

Users must connect wires according to the circuit diagrams on the following pages. Do not plug a modem or telephone line to the RS-485 communication port or permanent damage may result. Pins 1 & 2 are the power supply for the optional copy keypad only and should not be used for RS485 communication.

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Chapter 2 Installation and Wiring|

Fuse/NFB(No F use Breaker)

NFB

R S

Recommended Circuit when power s uppl y is turned O FF by a fault output

Factory setting: SINK Mode

Please refer to the following figure for wiring of SINK mode and SOURCE mode.

*RS-485 To commun icate to PC, it needs to use conv erter (VFD -USB0 1 or IFD8 500).

Forwar d/STOP

Rever se/STOP

Multi-step 1 Multi-step 2 Multi-st ep 3

Factory

Multi-st ep 4

setting

No fun ction

No function No function No fun ction Digital Signal Common

Ma in circ uit ( pow er) te rmina ls

Terminal EPS is emergency power input terminal, refer to the following figure for details.

For P G car d, refer to Appe ndix B for d etails .

(*1) When JP1

EPS

R(L1) S(L2)

T(L3 )

OFF

FWD

REV MI1 MI2 MI3 MI4 MI5 MI6

(*1)

MI7 MI8(*1) COM

+10V

Power supply +10V 20mA

AUI1/AUI2

Master Frequency

-10 to 10V

-10V

Power supply

-10V 20mA

4~20mA

ACI

ACM

1:+EV

1 2 3 4 5 6

2:GND 3:SG4:SG+ 5:NC 6:NC

on t he co ntrol boar d is in sert ed, M I8 is disa bled .

Br ake re si sto (optional)

+1 +2/B1

U(T1)

V(T2)

W(T3)

multifunction ter minals

EMVL-IOD01 extension c ard (optional)

Control circuit terminals

Brake res istor/Unit( optional) Re fer t o App endi x B fo r th e us e of special brake resistor/unit

PG Card (optional)

PG Card (optional) EMVL- PGABL EMVL- PGABO EMVL- PGH01

Multi-function contact output 2 (Relay) 240VAC 3A

MRA

120VAC 3A 24VDC 3A

MRC

factor y setting : indicates that it is running

MO1

Multi-function contact output 3 (photocoupler) 48VDC 50mA

MO2

Multi -functi on contact output 4 (photocoupler)

MCM

Multi -functi on Ph otoc oupl er Outp ut

increment al encoder

Multi-function contact output 1 (Relay) 240VAC 3A 120VAC 3A 24VDC 3A factory se tting: fault indication

Shielded leads & C able

Motor

IM/PM

Line driver

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Chapter 2 Installation and Wiring|

Figure 2 Wiring/Terminals setting for SINK(NPN) mode and SOURCE(PNP) mode

Sink (NPN) mode

Source (PNP) mode

used with internal power (+24Vdc) used with internal power (+24Vdc)

MI1

MI2

MI8

COM

Sink (NPN) mode

used with external power

MI1

MI2

MI8

COM

+24V

Source (PNP) mode

used with external power

MI1

MI2

MI8

COM

MI1

MI2

MI8

COM

Figure 3 Apply to 1-phase UPS power supply syste

Main power

1-phase UPS or battery

Specifications for 1-phase UPS and battery 250VDC (for 230V series) 500VDC (for 460V series)

To input emergency power

3 ~

AC motor drive

R/L1

S/L2

T/L3

EPS/+

EPS/-

MI1~8

COM

Timing diagram of M.C. (magnetic contact or)

Before i nputting emergency power, magnetic contactor and are ON and magnetic contactor should be OFF. Magnetic contactor should be ON after magnetic c ontactor is ON. Before r emoving battery and turn magnetic contactor to be ON, magnetic contactor and should be OFF

1 2 3

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+24V

Chapter 2 Installation and Wiring|

Figure 4 Apply to two batteries with main battery voltage is lower than 2 80Vd

Timing diagram of M.C. (magnetic contact or)

Before inputting emergency power, magnetic contactor and are ON and magnetic contactor should be OFF. Magnetic contactor should be ON after magnetic contactor is ON. Before removing battery and turn magnetic contactor to be O N, magnetic contactor and should be OFF.

1 2 3

2 1 3

48Vdc (230V Se ries)

96Vdc (460V Se ries)

1-phase UP S or battery Specifications for 1-phase UP S and battery 250VDC (for 230V series) 500VDC (for 460V series)

To input emergency power

Main power

3 ~

AC motor drive

R/L1

S/L2

T/L3

EPS/+

EPS/-

MI1~8

COM

DC voltage

motor speed

error output

electromagn etic valve

operat ion command

MI-COM=43

electromagn etic valve

EPS detection

MO-COM=9

low volt age level

free run

mechan ical br ake

OFF

drive ready

batt ery voltage

about 1 min.

about 2 sec

default EPS operati on frequ ency

CAUTION!

1. The wiring of main circuit and control circuit should be separated to prevent erroneous actions.

2. Please use shield wire for the control wiring and not to expose the peeled-off net in front of the

terminal.

3. Please use the shield wire or tube for the power wiring and ground the two ends of the shield

wire or tube.

4. Damaged insulation of wiring may cause personal injury or damage to circuits/equipment if it

comes in contact with high voltage.

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Chapter 2 Installation and Wiring|

5. The AC motor drive, motor and wiring may cause interference. To prevent the equipment

damage, please take care of the erroneous actions of the surrounding sensors and the

equipment.

6. When the AC drive output terminals U/T1, V/T2, and W/T3 are connected to the motor terminals

U/T1, V/T2, and W/T3, respectively. To permanently reverse the direction of motor rotation,

switch over any of the two motor leads.

7. With long motor cables, high capacitive switching current peaks can cause over-current, high

leakage current or lower current readout accuracy. For longer motor cables use an AC output

reactor.

8. The AC motor drive, electric welding machine and the greater horsepower motor should be

grounded separately.

9. Use ground leads that comply with local regulations and keep them as short as possible.

10. No brake resistor is built in the VFD-VL series, it can install brake resistor for those occasions

that use higher load inertia or frequent start/stop. Refer to Appendix B for details.

11. Multiple VFD-VL units can be installed in one location. All the units should be grounded directly

to a common ground terminal, as shown in the figure below. Ensure there are no ground

loops.

grouning terminals

Excellent

Good

grouni ng terminals

Not allowed

Revision Nov. 2008, VLE1, SW V1.03 2-5

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