Power Up Sequence
Power Up Sequence
When 24 VAC power initially is applied to the ZN510 controller, the following sequence occurs:
1.All outputs are controlled off.
2.The controller reads all inputs to determine their initial values.
Note: Because the space tempera- ture can be hardwired to the con- troller or communicated, the controller waits for several minutes to check for the presence of a com- municated value.
3.A random start time is hard coded on every board and cannot be disabled. The board generates a random time delay between 0 and 25 seconds. Once this time expires, the power up control wait time (if configured) will wait for 120 seconds. The power up control wait allows ample time for a communicated request to arrive. If the power up control wait time expires, and the controller does not receive a communicated occupancy command, the unit assumes stand alone operation.
4.Normal operation begins.
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