Altrad Belle GPX 2700, Руководство оператора

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11
ESTIMATING POWER CONSUMPTION
Identifying the correct generator for an application is not always straight forward. There is often dif
¿
culty determining the actual
power requirements to both start and run the expected load(s). A generator should be considered capable if it can operate within
the frequency and voltage speci
¿
cation, for one second after it begins to power the appliance. Some appliances, especially electric
motors, may overheat or become damaged by prolonged or repeated connection to a power source, which is insuf
¿
cient to start them.
The two important factors to remember are:
1) Ensure the total load does not exceed the generators rated continuous output, for more than 30 minutes.
2) Never exceed the generator’s maximum output speci
¿
cation.
The best way to ensure that neither of the above occurs is to contact the manufacturer of the equipment that is intended for use with
the generator. Alternatively a useful way to measure the starting and running current for the appliance is to use a Altrad Belle Minigen
meter. The unit can monitor volts, amps and frequency to help guarantee the performance of both the generator and tools. If it is not
possible to test the appliance, then the following information will allow the size of the generator required to be estimated.
RESISTANCE TYPE LOADS
Examples: Light bulbs, toasters, hair dryers, coffee pots, irons and other appliances, which have heating elements.
This type of load is usually rated in watts, but sometimes a combination of watts and amps will be given. It is possible to select a
suitable generator by comparing the speci
¿
cation of the generator with the generator output speci
¿
cation.
Method 1: Use when load is rated in watts.
Estimating Power Consumption
GB
Indicated wattage of resistance type load = Watt = VA = Required Generator Output
Power factor for resistance 1
Method 2: Use when voltage and measured current are known.
INDUCTIVE AND CAPACITIVE TYPE LOADS:
Examples: Appliances or tools with electric motors, air conditioners, microwave ovens, televisions,
À
uorescent lights and any other
appliances that are not simply resistance type loads.
This type of appliance (especially those that use electric motors) may require more power to start then is indicated by their running
power ratings. It is not possible to select a generator by the power rating information given on the appliance; it is necessary to
know both the staring current and running current required.
Running power requirements:
Method 1: Use when load is rated in watts.
Speci
¿
ed voltage of the x Measure current of the = VA = Required Generator Output
resistance type load resistance type load
Indicated wattage of inductive/capacitive load = Watt = VA = Required Generator Output
Indicated Power factor <1
Method 2: Use when voltage and measured current are known.
Speci
¿
ed voltage of the x Measure current of the = VA = Required Generator Output
inductive/capacitive load inductive/capacitive type load
Starting power requirements:
Method 1: Use when starting current and voltage are speci
¿
ed.
Indicated starting current x Speci
¿
ed voltage of the = VA = Starting power requirements
inductive/capacitive load
Method 2: Use when starting current and voltage are speci
¿
ed.
Measured starting current x Speci
¿
ed voltage of the = VA = Starting power requirements
inductive/capacitive load