Bosch High-frequency production tools professional blue Page 45
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Guide | High-frequency technology | 45 powerful high-frequency tool connected. This guaran- Electrical operating variables overload, the voltage drop in the frequency converter for a high-frequency tool system. The higher mo- does not become too great. tor speed at 300 Hz is particularly advantageous for grinders at today’s circumferential speeds. Network groups The higher motor speed results in higher machine Operating frequencies and operating voltages: power at the same weight. In all countries, a volt- Network group number 200 Hz age of 135 V should be selected at 200 Hz and 1 265 V – a voltage of 200 V at 300 Hz where possible. 2 135 V 200 V 3 72 V (110 V) 4 – 72 V The secondary power output of the frequency con- 300 Hz verter or its size is calculated as follows: The high-fre- 7 – 42 V quency tools provided are grouped according to motor 10 42 V – size and quantity, so that you can add up their rated Ideal network group current consumptions. The total apparent power input of the tools can be calculated by multiplying the sum Calculation example for a high-frequency tool sys- of the rated currents by the operating voltage and the tem: factor √ 3. The formula is as follows: In a foundry, 3 high-frequency angle grinders 0 602 332 534 with 230 mm diameter cutting discs S = √ 3 · U · I = 1.73 · U · I and 3 high-frequency straight grinders 0 602 242 134 The resulting apparent power value still has to be mul- ANGLE GRINDERS An operating frequency of 300 Hz is recommended STRAIGHT GRINDERS tees faultless start up of the tools. In the event of brief with 100 mm diameter grinding discs are to be used. tiplied by the demand factor G, in order to obtain the secondary power output of the converter. The demand factor G accounts for the degree of operation of all tools because usually not all tools are operated at the Calculation: (Refer to pages 8–17 and 24–29 for current and voltage values.) motor size 88 The following empirical values are available for the 3 straight grinders, demand factor: motor size 85 Car body construction 0.45 Sum: Engine construction 0.30 Apparatus construction 0.40 3 · 10 A = 30.0 A 3 · 6.4 A = 19.2 A 49.2 A This results in the apparent power: 0.25 = 1.73 · 200 V · 49.2 A Steel construction 0.50 = approx. 17 023 VA Foundry 0.60 = approx. 17 kVA These values only apply to larger numbers of ma- This value still has to be multiplied by the demand fac- chines. At a lower number of machines, the demand tor G · 0.6 for foundries: factor is determined by the largest, most frequently Converter apparent power = used tools. S · G = 17 kVA · 0.60 = 10.2 kVA When planning a high-frequency tool system, the In this case, a converter with 11 kVA secondary power frequency converter is always designed with a certain is selected, so that there is still a power reserve of ap- reserve. Especially when using small systems, it must prox. 10%. twice as large as the rated power input of the most HIGH-FREquENCy TECHNOLOGy S = 1.73 · U · I Mould and die construction be calculated such that the power output is at least ACCESSORIES 3 angle grinders, same time.
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