Report

 

of devices testing with the purpose of its efficiency and energy saving evaluation

 

 

Equipment used for tests

 

1. Motor with reductor (Y/D connection) depending on scheme.

For maximum load creation variable speed gear was set to 270 rev/min

SIEMENS 1LA7090-4AA11,

50 Hz 230/400V

1,1 kW 4,4/2,55 A

Cos -0.81 1415 rev/min

MOTOVARIO TXF/010

s/n 9052652

n2 950-270 rev/min

 

2. Protection circuit breaker

GE SFKOJ 6.3-10 A

 

3. Measuring device for energy measure

CIRCUTOR CVM-NRG96-ITF-RS485-C

s/n 39881000415.

 

Tested devices

 

1. Softstarter ASTAT PLUS - QC1F-DP made by GE.

 

2. Frequency invertor VAT-3 FDv - UAVX035LS

s/n 8G3430A 2

 

  

3. Frequency invertor VAT20 U20X2K2S

s/n (21)63380820172300040300

 

4. Frequency invertor SIEMENS MicroMaster Vector.

 

5. Frequency invertor DANFOSS VLT2800 VLT2815PT4B20STR1DBF00A00

P/N 195N1039 , s/n 106025G185.

 

6. Softstarter ASTAT SD - QS1D-NA made by GE.

 

7. Frequency invertor OMRON V1000;

Type: VZAB1P5BAA

Model: CIMR-VZBA0010BAA REV:A

s/n J0072C136810081.

 

8. Frequency invertor MITSUBISHI F700

Type: FR-F740-00083-EC

s/.n C76K32002.

9. Frequency invertor EMERSON COMMANDER SK - 1.5 kW

Type: SKB3400150 1.5 kW

s/n 2080100089 made by CONTROL TECHNIQUES.

 

10. Frequency invertor EMERSON COMMANDER SK - 1.1 kW

Type: SKBD200100 1.1 kW

s/n 2080403079 made by CONTROL TECHNIQUES.

 

11. Frequency invertor VAT2000

Made by GE

Type: U2KX02K2S

 

12. Frequency invertor OMRON VARISPEED G7

      Type CIMR-G7C41P5

       s/n J0065B961210008

                                      

The method ot test

 

A test stand was created for all abovementioned equipment testing. All devices were tested during 1 day each with constant frequency 50Hz. Phase sequence and motor load remained constant.

Test 1

 

Direct start

 

Motor is connected directly with circuit breaker and recorder.

 

Scheme:

 

380v

 

Nr

Date

Indication of CIRCUTOR (kWt/h)

1

08 Apr 2008 12:50

0

2

09 Apr 2008 12:50

29.761

3

 

 

 

 

 

Consumption per day 29.761 kWt/h

Consumption per hour - 1.24 kWt/h

Test 2

 

Softstarters and invertors

 

The motor was connected with following devices:

 

1. ASTAT PLUS in energy saving mode

2. VAT 3 FDv

3. VAT-20

4. VAT2000

5. DANFOSS VLT2800

6. ASTAT SD in energy saving mode

7. MITSUBISHI F700

8. EMERSON COMMANDER SK - 1.5 kW

 

 

 

ASTAT PLUS

 

Nr

Date

Idication of CIRCUTOR (kWt/h)

1

09 Apr 2008 13:00

0

2

10 Apr 2008 13:00

22.125

3

 

 

 

Consumption per day 22.125 kWt/h

Consumption per hour - 0.922 kWt/h

 

 

 

 

 

 

ASTAT SD

 

Nr

Date

Indication of CIRCUTOR (kWt/h)

1

17 Apr 2008 00:45

0

2

18 Apr 2008 00:45

21.6

3

 

 

 

Consumption per day 21.6 kWt/h

Consumption per hour - 0.900 kWt/h

 

VAT 3FDv

 

Nr

Date

Indication of CIRCUTOR (kWt/h)

1

10 Apr 2008 13:05

0

2

11 Apr 2008 13:05

6.779

3

 

 

 

Consumption per day 6.779 kWt/h

Consumption per hour - 0.282 kWt/h

 

VAT - 20

 

Nr

Date

Indication of CIRCUTOR (kWt/h)

1

15 Apr 2008 00:15

0

2

16 Apr 2008 00:15

2.752

3

 

 

 

Consumption per day 2.752 kWt/h

Consumption per hour - 0.115 kWt/h

 

DANFOSS VLT2800

 

Nr

Date

Indication of CIRCUTOR (kWt/h)

1

16 Apr 2008 00:30

0

2

17 Apr 2008 00:30

6.631

3

 

 

 

Consumption per day 6.631 kWt/h

Consumption per hour - 0.2763 kWt/h

 

MITSUBISHI F700

 

Nr

Date

Indication of CIRCUTOR (kWt/h)

1

29 Apr 2008 11:15

0

2

30 Apr 2008 11:15

4.968

3

 

 

 

Consumption per day 4.968 kWt/h

Consumption per hour - 0.207 kWt/h

 

  

EMERSON COMMANDER SK 1.5 kW

 

Nr

Date

Indication of CIRCUTOR (kWt/)

1

30 june 2008 13:00

0

2

01 july 2008 13:00

10.07

 

Consumption per day 10.07 kWt/h

Consumption per hour - 0.4196 kWt/h

 

 

                                         OMRON VARISPEED G7

 

N /

Date

Indication of CIRCUTOR (kWt/)

1

11 septembri 2008 8:50

0

2

12 septembri 2008 8:50

13 septembri 2008 8:50

8.781 (The power savings mode is switched off)

                  8.04 (The power savings mode is switched on)

 

Consumption per day - 8.781 kWt/h

Consumption per hour - 0.367 kWt/h

Test 3

 

Invertors

The motor was connected with following devices:

 

1. Frequency invertor SIEMENS MicroMaster

2. Frequency invertor OMRON V1000

3. Frequency invertor EMERSON COMMANDER SK - 1.1 kW

 

 

 

 

 

 

SIEMENS MicroMaster

 

Nr

Date

Indications of CIRCUTOR (kWt/h)

1

15 Apr 2008 00:15

0

2

16 Apr 2008 00:15

3.3

3

 

 

 

Consumption per day 3.3 kWt/h

Consumption per hour - 0.1375 kWt/h

 

OMRON V1000

 

Nr

Date

Indications of CIRCUTOR (kWt/h)

1

28 Apr 2008 11:00

0

2

29 Apr 2008 11:00

3.104

3

 

 

 

Consumption per day 3.104 kWt/h

Consumption per hour - 0.129 kWt/h

 

 

EMERSON COMMANDER SK 1.1 kWt.

 

N /

CIRCUTOR (kWt/)

1

01 july 2008 14:00

0

2

02 july 2008 14:00

3

 

 

 

7.11 kWt/h

- 0.296 kWt/h

 

Result table

 

 

Nr

Place

in competition

Device

Energy consumption kWt/h

Energy consumption

(%)

Energy saving

(%)

1

1

VAT 20

  2.752

9.247

90.75

2

2

OMRON V1000

  3.104

10.43

  89.57

3

3

SIEMENS MicroMaster

3.30

11.09

 88.91

4

4

MITSUBISHI F700

4.968

16.69

83.81

5

5

DANFOSS VLT2800

6.631

22.28

77.72

6

6

VAT - 3FDv

6.779

22.77

77.23

7

7

VAT2000

7.087

23.81

76.19

8

8

EMERSON COMMANDER SK - 1.1 kWt

7.11

23.89

76.11

9

9

OMRON G7

8.04

27.02

72.98

10

10

EMERSON COMMANDER SK - 1.5 kWt

10.07

33.84

66.16

11

11

ASTAT SD

21.6

72.58

27.42

11

12

ASTAT CD

22.125

74.34

25.66

13

13

Direct Start

29.761

100

    0

 

 

                                                   Conclusions

 

According to the test the following conclusions could be made:

 

Frequency invertors and softstarters are highly effective devices for motor control.

Also it have their own advantages and disadvantages

 

 

Invertors

 

Pro (+):

- smooth rotation speed change

- high energy saving efficiency

- built-in programming and control functions for different modes

- soft start of motors

- multi motor application (up to 5)

- autotuning of consumpted power according to applied load

- always optimal mode of motor work

- partial reactive power compensation

 

Contra (-):

 

- high price (approx 1 kW = 250 USD)

- shielded cable required

- generation of electromagnetic interference

- additional filters required

- generation of reactive power, cos reduction, that causes active and reactive power disbalance

- regular technical service needed

- special knowledge of programming and tuning required

 

 

Softstarters

 

 

Pro (+):

 

- soft start of motors

- reduction of start currents

- energy saving

- relatively low price (approx 1 kW = 100 USD )

- long maintenance-free period

- normal cable and installation materials

- simplicity in installation and programming

- do not influence on reactive power and Cos

- autotuning of consumpted power according to applied load

- almost optimal mode of motor work

Contra (-):

 

- no possible regulate rotation speed

- energy saving lower than invertors have

- additional equipment for inserting of control circuit needed

 

 

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