The following information is required for a new support constraint.

Name. See: Common Parameters.

Description. See: Common Parameters.

Order Index. See: Common Parameters.

System Height Low. This parameter is the minimum vertical distance possible between the centre of the catenary wire and the centre of the contact wire for the arrangement.

This parameter should be positive.

The default value for System Height Low should be 0 for all support constraints that are used with auxiliary systems.

System Height High. This parameter is the maximum vertical distance possible between the centre of the catenary wire and the centre of the contact wire for the arrangement.

This parameter must be greater or equal to the System Height Low parameter for each support constraint.

This parameter should be positive.

The default value for System Height High should be 10 for all support constraints that are used with auxiliary systems.

System Height Delta. This parameter is used for support constraints intended for MPA (mid-point anchor) on gantry arrangements.

This parameter is the vertical distance from the bottom of the gantry that the support constraint is to be used with, to the centre of where the catenary wire will terminate at the MPA on gantry arrangement.

The default value for System Height Delta should be 0 for all support constraints that are not MPA on gantry arrangements.

Driver. This parameter must either be ‘True’ or ‘False’. If the support constraint will be used to support an auxiliary system and is not used for termination, then this parameter must be ‘True’. In any other case, this parameter must be ‘False’.

Filter Type. This parameter must either be ‘Pull Off’ or ‘Push Off’. This parameter defines if the support constraint will be available for selection, dependent on the user’s choice in the ‘Push/Pull’ field in the ‘Configure’ window.

For all anchoring or non-catenary support constraints, ‘Push Off’ should be chosen.