404 Set Operational Limits 2 Axis

Set Operational Limits 2 Axis

The following instructions apply to locations above 23 1/2 degrees N and below 23 1/2 degrees south.

There are 3 Operational Limits to implement

  1. Soft Limits
  2. Mechanical or Proximity Limit Switches
  3. Night Stowage Setting

Soft limits will limit the tracker’s travel through software on both axis. If the calibration with the sun is incorrect then the soft limits will be off by the same amount so it is important calibrate the controller  before setting the soft limits. The soft limits add a degree of redundancy as a back up to mechanical limit switches. They can be configured to prohibit travel inside or outside the range of travel between the mechanical switches. Settings can be between 0-360 degrees Azimuth axis and -10 to 180 degrees Altitude axis.















Inside the HARD LIMIT SWITCH MAX as shown in Figure 1 &  2, the tracker will stop prior to reaching the switch.
This might be used to save wear on the mechanical switch.


Outside the HARD LIMIT SWITCH MIN, the tracker will stop when it encounters the mechanical switch. This is selected when Auto Cal is in use or as a backup to the switch.

Mechanical or Proximity Limit Switches are wired to the controller and provide physical limits to the tracker’s travel. These should be located at the furthest point the Tracker should ever travel. The Tracker IPm will operate without limit switches but it is not recommended.

You should always use mechanical limit  or proximity switches to prevent over travel which could cause personal injury, damage the tracker or to nearby structures.

Test Limit Switches thoroughly prior to putting the tracker into service.

For increase accuracy and reliability, when Auto Cal is selected for each axis, the controller will re zero itself each time it touches the minimum limits. It is important to always  set the soft limit outside the mechanical switch position. Read more more on configuring Auto Cal …

 Night Stowage Setting moves the tracker to a pre-set position at sunset. If the position is outside either the soft or mechanical limits, the tracker will stop at the limit it encounters first and never reach the configured stowage position. Read more on configuring Night Stowage …


Continue on Tab F IN


Click for enlarged view

See Figure below.  Arrows indicate “Required Information” Disregard I/O Tag Names beginning with AZI for Single Axis or Parabolic Trough.

Next Step:  Sunset Storage Position