AS NZS 60335.2.79:2002 pdf free.Household and similar electrical appliances- Safety Part 2.97: Particular requirements for drives for shutters, awnings, blinds and similar equipment.
20.101 Rolling driven parts shall be prevented from unrolling in a hazardous manner.
Compliance is checked by the following test, which is carried out with the drive disconnected from the supply mains.
The drive is loaded with twice the rated load for 30 mm. If the drive is supplied with a driven part, the load is applied to the driven part and is equal to the highest force exerted by it.
NOTE The highest force is determined with the driven part in the most unfavourable position.
Spring-controlled driven parts are fully retracted and a force equal to the mass of the driven part is applied in the unrolling direction for 30 mm.
The driven part shall not move faster than 150 mm/s.
The test is repeated with the drive supplied at 0,85 times rated voltage.
20.102 Drives shall prevent the driven part from unrolling in a hazardous manner due to a reduction of the supply voltage.
Compliance is checked by the following test.
The drive, with the driven part approximately half unrolled, is supplied at 0,85 times rated voltage and operated until the driven part is fully unrolled. The driven part shall not unroll in an uncontrolled manner.
After 15 s, the driven part is retracted.
The drive is then supplied at 0,9 times rated voltage and started 10 times from different positions in the rolling direction so as to retract the driven part. The drive is allowed to come to rest between successive starts.
The drive shall retract the driven part to the fully rolled position each time and protective devices shall not operate.
20.103 The actuation of a control to stop the movement of the drive shall be effective.
Compliance is checked by the following test.
The drive is supplied at rated voltage and operated under normal operation in each direction and the control is then actuated.
The driven part shall not move more than 100 mm before stopping.
NOTE The release of a biased-off switch is considered to be actuation.
20.104 Drives shall operate so that injury is prevented during movement of the driven part.
This requirement is considered to be met if the drive is controlled by a fixed biased-off switch only or if the driven part at any point in travel is at a height of at least 1,8 m from the ground or any access point. This requirement is also considered to be met when the driven part is made of soft material and any rigid part of the drive is installed at 1,8 m above ground or any access level.AS NZS 60335.2.79 pdf download.