E.T. Systems UMPETHA Installer's Instructions page 6

BEFORE ATTEMPTING TO INSTALL A SLIDE GATE OPERATOR, PLEASE BE CERTAIN YOU HAVE READ AND
UNDERSTOOD THE FOLLOWING TO ENSURE CONTINUED SATISFACTORY SAFE SERVICE FROM THIS PRODUCT:
The following are points to note before installing your new slide gate operator:
GATE MECHANICS
a) Gate Leaf
Gate leaf must be sound and of sufficient construction to accommodate an operator of this type (see technical specifications).
Gate leaf should be straight and true with minimal deviation to the fascia that the rack must attach to (no 'banana-effect').
b) Wheels and track
The track must be secure, straight, level and free of all obstructions.
Recommended wheel type and size for this automation is steel or steel alloy, machined or cast wheels of at least 100mm diameter using
sealed roller bearings. The larger the wheel the less rolling resistance generated. Larger wheels also maintain their plumb and momentum
longer. When wheels are fixed in the gate, and not able to pivot, binding can occur if the gate is bowed (banana effect) For wheel profile
and matching track types, see the three examples below:
c) Guides

It is recommended that a roller guide consisting of a sealed roller bearing clad in nylon be used.

The guidance system should be installed at the top edge of the gate whenever possible. In cases where this is not possible the
guidance system should never be below the halfway point of the total gate height when the gate is in position on it's track.

In the case of a single guide roller running in a guide channel, ensure the guide never touches both inside walls of the channel
simultaneously. This causes the roller to snag as it tries to roll in both directions at once.

In the case of 2 guide rollers being used on either side of the gate leaf, ensure that both wheels never touch the leaf
simultaneously.

Avoid using more than 1 guide roller on the same side of the gate leaf to prevent binding.

As with the wheels the larger the guide the less rolling resistance generated.
d) Gate Travel
Using a fish-scale, as shown below, pull the gate fully open and fully closed at approximately the same speed as the operator you intend to
use (see technical specifications). For optimum duty cycle, ensure that the maximum resistance does not exceed 10kgF starting and 6kgF
running. The starting resistance should fall away within 300 to 500mm. Note the recommended track, wheel and guide types mentioned b)
and c) above.
NB! Install physical stoppers at the ends of the gate travel to avoid the gate over-running the ends of the track - as shown here. (National
safety standard requirement)
UMPETHA 082009/072010.014
1. Gate mechanics
2. Cabling requirements
Recommended Less problematic
6
Problematic