Any fans fitted to the engine of the equipment or its hydraulic system shall operate during the test. Manufacturers or their authorised representatives in the Union shall set the fan speed in accordance with the requirements laid down in points (a) to (d), as applicable, and state that fan speed in the test report and use it in further measurements. Fans shall not operate in reverse mode during tests.
(a) Fan drive directly connected to the engine or its hydraulic system:
A fan drive that is directly connected to the engine or its hydraulic equipment shall operate during the test.
(b) Fan drive with several distinct speeds:
A fan that can work at several distinct speeds shall be tested in either of the following ways:
(i) at its maximum working speed;
(ii) in a first test with the fan set at zero speed, and in a second test with the fan set at maximum speed.
For the purposes of point (ii), the resulting A-weighted surface sound pressure level L pA shall be calculated by combining both test results using the following equation:
where:
L pA,0 % is the A-weighted surface sound pressure level determined with the fan set at zero speed;
L pA,100 % is the A-weighted surface sound pressure level determined with the fan set at maximum speed;
(c) Fan drive with continuous variable speed:
A fan that can work at continuous variable speed shall be tested in accordance with point 1.1(b) or with the fan speed set at no less than 70 % of the maximum speed.
Visco-static fans, which are automatically regulated by the engine temperature, shall be considered to work at continuous variable speed irrespective of the origin of the control;
(d) Equipment with more than one fan:
Where a machine is equipped with more than one fan, all fans shall run under the conditions specified in (a), (b) or (c), as applicable.