The driveway gate pull and running forces should be measured before purchasing or installing any gate opener. However, should the measured forces exceed those in the table above for the Ultima units, therefore the motor must not be installed. It may be possible to reduce these forces by carrying out maintenance on the gate rail but if not, then the motor must not be installed.

These forces can be measured using a fishing or luggage scale (see figure above).

Gradient = A (0.3m) / B (4m)

Effective Gate Weight
When is a 200kg gate really 800kgs – Working out the effective gate weight

Effective Gate Weight = 40 x gradient + 1 x actual gate weight
Eg. A driveway, that falls 300mm over 4m (.300/4 = .075 gradient) has an effective weight of 800kgs
Effective Gate Weight = 40 x .075 + 1 x 200
Therefore, the example above wouldn’t suit either of these motors

80kg actual gate weight – Fall 100mm over 4m = 160kg effective gate weight

80kg actual gate weight – Fall 200mm over 5m = 208kg effective gate weight

150kg actual gate weight – Fall 350mm over 6m = 266kg effective gate weight