Cross sect.

Resistivity

 

Maximum length in meters to limit

 

area

 

voltage drop to 1V or less

 

OHM/Km

 

 

(mm²)

10A

20A

50A

100A

200A

400A

 

2.5

8.21

12.0

6.0

2.4

1.2

0.6

0.3

4

5.09

18.6

9.8

4.0

2

1.0

0.5

6

3.39

29.4

14.8

5.8

2.9

1.45

0.7

10

1.95

51.2

25.6

10.2

5.1

2.5

1.25

16

1.24

80.0

40.0

16.0

8

4

2

25

0.795

125.0

62.0

25.2

12.6

6.3

3.1

35

0.565

177.0

88.0

35.4

17.7

8.8

4.4

Table 3-3: Maximum wire length for 1 V drop on lead (in meters)

For currents not shown in Table 3-2 and 3-3, use the formula:

Maximum length=1000/(current x resistivity)

Where current is expressed in Amperes and resistivity in ohms/km or ohms/1000ft.

3.9.3Wire termination

The wires should be properly terminated with terminals securely attached. DO NOT use unterminated wires for load connection at the power supply.

CAUTION

When local sensing, a short from +LS or +S to -V or -S or -LS, will cause damage to the power supply. Reversing the sense wires might cause damage to the power supply in local and remote sensing. (Do not connect -S to +V or +S to -V).

3.9.4Noise and Impedance Effects

To minimize the noise pickup or radiation, the load wires and remote sense wires should be twisted pairs to the shortest possible length. Shielding of sense leads may be necessary in high noise envi- ronments. Where shielding is used, connect the shield to the chassis via a rear panel Ground screw. Even if noise is not a concern, the load and remote sense wires should be twisted-pairs to reduce coupling, which might impact the stability of power supply. The sense leads should be separated from the power leads.

Twisting the load wires reduces the parasitic inductance of the cable, which could produce high fre- quency voltage spikes at the load and the output of the power supply, because of current variation in the load itself.

The impedance introduced between the power supply output and the load could make the ripple and noise at the load worse than the noise at the power supply rear panel output. Additional filtering with bypass capacitors at the load terminals may be required to bypass the high frequency load current.

3.9.5Inductive loads

Inductive loads can produce voltage spikes that may be harmful to the power supply. A diode should be connected across the output. The diode voltage and current rating should be greater than the power supply maximum output voltage and current rating. Connect the cathode to the positive output and the anode to the negative output of the power supply.

Where positive load transients such as back EMF from a motor may occur, connect a surge suppres- sor across the output to protect the power supply. The breakdown voltage rating of the suppressor must be approximately 10% higher than the maximum output voltage of the power supply.

20

83-515-000 Rev. B

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TDK 5KW technical manual Wire termination, Noise and Impedance Effects, Inductive loads
Page 27 Page 29

5KW specifications

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