TOSHIBA

Parameter Explanations (cont'd)

DYNAMIC BRAKING (Feature not available in H3 drives above 30 horsepower)

When a motor is mechanically forced to spin faster than the output frequency of the drive, the motor acts as a generator. This regenerated energy forces current to flow into the drive's DC bus. The bus capacitors will absorb some of the regenerative energy by charging and raising the DC bus voltage. At high bus voltages, the drive can be programmed to fire the IGBT7 dynamic braking transistor. This prevents a common drive fault, DC BUS OVERVOLTAGE. The dynamic braking resistor, attached by the user to the "PA" and "PB" terminals, dissipates the bus energy as heat when the IGBT7 fires. Two resistor values are of concern: resistance (ohms) and power (watts). Insufficient resistance may lead to IGBT7 damage; too low of a wattage may result in braking resistor damage from overheating.

Inspection

Specifications Precautions

HEAVY DUTY RESISTORS WATTS: 300 watts per drive HP

H3

H.D.

H3

H.D.

Model

Ohms

Model

Ohms

2035

35

4055

108

2055

28

4080

65

2080

20

4110

60

2110

12

4160

38

2160

7.0

4220

30

2220

6.0

4270

22

2270

5.0

4330

20

2330

4.0

 

 

 

 

 

 

LIGHT DUTY RESISTORS WATTS: 60 watts per drive HP

H3

L.D.

H3

L.D.

Model

Ohms

Model

Ohms

2035

150

4055

360

2055

90

4080

240

2080

61

4110

180

2110

45

4160

120

2160

30

4220

90

2220

23

4270

70

2270

18

4330

61

2330

15

 

 

 

 

 

 

Wiring

Jumpers

Panel

Contact your Toshiba distributor for dynamic braking resistor part numbers and information.

Item 145, OVERVOLTAGE STALL PROTECTION - This function is turned on as a default setting. Overvoltage stall protection causes the drive to automatically extend the decel time when the DC bus voltage increases due to regeneration. The value stored in DECELERATION TIME #1 / DECELERATION TIME #2 is not changed. The drive may still trip on overvoltage if the decel time is very small.

Keypad

Programming Parameters

Service

Dimensions

Index

9 - 16

Page 85
Image 85
Toshiba H3 manual Heavy Duty Resistors Watts 300 watts per drive HP, Light Duty Resistors Watts 60 watts per drive HP

H3 specifications

The Toshiba H3 is a notable addition to Toshiba's lineup of high-performance laptops, designed for users who demand both power and portability. It combines sleek aesthetics with robust technology to meet the needs of modern professionals, students, and gamers alike.

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