Satec System 295 Installation And Operation Manual page 104

Example 4-8 Sample Of Repeated Condition-Gated Operations
Conjunction
Condition #1 OR
Condition #2 AND
Condition #3 AND
Setpoint actions
Action type
Action #1 Operate relay
Manual Setpoint Operations
The next example shows how to manually override setpoint conditions to operate
relay output via communications (see Example 4-9).
Programmable event flag #1 connected as a trigger with an OR operation is used to
provide manual forced setpoint operation. Manual setting of event flag #1 to ON
will immediately (since no operate delay specified) operate the setpoint by overriding
other setpoint conditions. Clearing the event flag does not ensure that the setpoint
will be released if other operate conditions are still fulfilled.
Example 4-9 Sample Of Manual Relay Operations
Conjunction
Condition #1 OR
Condition #2 OR
Condition #3 OR
Condition #4 OR
Setpoint actions
Action type
Action #1 Operate relay
In the same example, supposing for condition #4, an OR operation is replaced by an
AND operation, and the ON condition is reversed to OFF, manual clearing of event
flag #1 will force the setpoint to be released regardless of other setpoint conditions.
Manual setting of the event flag will have no effect if other operate conditions are
not fulfilled.
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Trigger conditions
Trigger parameter
Timer #1
R-T total kW
Relay status
Action target
#1
Trigger conditions
Trigger parameter
R-T total kW
R-T total PF Lag
R-T total PF Lead
User event flag #1
Action target
#1
Condi- Operate Release
tion limit limit
≥
20200 20000
OFF
Delays
Unit Operate Release
0.1 s 0 5
Condi- Operate Release
tion limit limit
≥
20050 20000
≤
0.75 0.80
≤
0.75 0.80
ON
Delays
Unit Operate Release
0.1 s 0 0
Operation Techniques