Main Operating States - Diamond H2O Reliant DRS4-EM-15 Manual

10.

Main Operating States

Figure 21 shows the main operating states for the software and how they interact.
Figure 21: 762 State Diagram
A. Power On Reset
This will monitor the AC input to determine if the control is operating on 50 or 60 hertz power.
Function will pass to the self-test routine if the set key is pressed. The routine initializes all ports
and time bases. It reads data from the information memory and checks the validity of the data.
The control will set a flag indicating the time of day needs to be set.
B. Self-Test
The self-test routine will enter from and return to the power on reset routine. The self-test
routine will test all inputs and outputs. A simple test fixture will be used to connect to the
outputs and inputs.
C. Standby Power
The standby power routine is called anytime the unregulated voltage falls to a level indicating
that AC power has been lost. The microcontroller is placed in a sleep mode waking to maintain
the current time of day. Power to operate the microcontroller is supplied by a super capacitor.
The display will show the programmed valve number when it wakes from standby power.
D. System Setup
The initial programming routine is used to load a set of programmable variables based on the
resin volume in the softener. The system setup is a two-step process. First the valve is selected,
and then the resin volume is selected. The system setup routine is normally entered from the
Self
Test
In Service
Standby
Power
Regenerating
Power
On
System
Reset
Setup
Program
and Data
Display
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